2007.5–2012
Early 6.7 common rail
First pickup DPF/EGR generation.
Technical libraryField manual
2007.5–current · generation overview
Cummins 6.7
Diagnostic manual
Rail pressure, airflow and aftertreatment must tell the same story.
Common reference specifications: These are common reference specifications. Always look up the current OEM procedure and specifications for your exact vehicle, VIN/engine serial number and installed hardware before performing repairs. Model year, engine revisions and replacement parts can change the requirements. For aftermarket fasteners, follow the current instructions for the exact kit and lubricant. Never loosen a common-rail line while cranking or running, reach for a suspected pressure leak, bypass safety controls, or work under an unsupported vehicle.
Pick the hardware first
Which version is in the truck?
The 6.7 is not one frozen design. Supply hardware, turbo control, injection equipment and emissions strategy changed, so select the year first and graph the whole system.
2013–2018
SCR/DEF common rail
Added SCR and revised fuel/air controls.
2019–2024
SO / High Output
Revised block, valvetrain and fuel-system coverage.
2025+
Current generation
Do not reuse earlier torque or pressure values.
Find your test
Numerical coverage is limited to the applications shown in the selector. The generation overview is not a claim of complete model-year coverage. Mechanical procedures have a separate search below.
Measured pass / fail data
Numbers before parts
Read the application and test condition on each value; mixed-year chapters still require selecting the correct labeled step. These are field-diagnostic references, not permission to reuse a specification on a different pump, injector, calibration or model year.
System / testTargetTest conditionApplies to
Crank / no-start
Rail pressure to enable injection
Target
> 4,000 psi
Test condition
Watch actual pressure through cranking
Applies to
2007.5–2018 CP3 systems
Sensor plausibility
Rail pressure KOEO
Target
0 psi ±500 psi
Test condition
Key on, engine off
Applies to
2007.5–2018
Low-pressure supply
CP3 inlet pressure
Target
10–15 psi
Test condition
Warm idle; verify volume and aeration too
Applies to
2007.5–2018
Pressure control
Actual-to-desired oscillation
Target
≤500 psi swing
Test condition
Warm idle with rail pressure graphed
Applies to
2007.5–2018
Injector installation
Connector-tube nut final torque
Target
42 lb-ft (57 N·m)
Confirm by VIN/ESN and current service information before assembly.
Test condition
Final tightening step after injector/tube seating sequence
Applies to
2007.5–2018 reference only
Pump capacity
CP3 outlet-volume test
Target
≥70 mL at 150 RPM or ≥90 mL at 200 RPM
Test condition
Three 10-second crank intervals; approved service tooling required
Applies to
2007.5–2012 reference
Pump return
CP3 return flow
Target
<1,150 mL/min
Test condition
Warm idle
Applies to
2007.5–2012 reference
Injector return
Combined return
Target
≤210 mL in 30 s
Test condition
26,107 psi override at 1,200 RPM
Applies to
2007.5–2012 reference
Injector return
No-start cranking return
Target
≤40 mL in 10 s total
Test condition
200 RPM cranking; protect starter from overheating
Applies to
2007.5–2012 reference
Unit check: 1 MPa ≈ 145 psi; 100 kPa ≈ 14.5 psi. Keep the scan tool’s displayed unit visible when recording data.
Service-data rule: confirm assembly torque and any test that opens or blocks a high-pressure circuit against current VIN/ESN-specific OEM information.
Manual contents
Choose the complaint or system
Each chapter is a test path. Open it, perform the checks in order, and let the result—not the most expensive part—decide the next move.
01Preliminary checksStart here before clearing codes or opening the fuel system.
1
Test
Verify the complaint
Record cold/hot, ambient temperature, fuel level, recent repairs and exactly when the fault occurs. Duplicate it without clearing anything.
If it passes
The failure is repeatable and its operating conditions are documented.
If it fails
Intermittent complaint: inspect history, connectors and freeze-frame before a road test with recording enabled.
2
Test
Save the evidence
Run a complete module scan. Save active, pending and history codes, freeze-frame, monitor status and a short cranking or drive log.
If it passes
Codes and data agree with the complaint.
If it fails
Conflicting or communication codes: stabilize system voltage and diagnose network/power faults first.
3
Test
Inspect fluids and air path
Sample fuel in a clean clear container. Check oil level and odor, coolant, air filter, intake plumbing and visible harness damage.
If it passes
Fuel is clean, oil is not diluted, coolant is stable and the intake is open.
If it fails
Stop for wrong fuel, water, DEF, metal, fuel-diluted oil or coolant loss. Correct the root condition before repeated cranking.
4
Test
Identify the exact system
Confirm model year, engine code and whether this truck uses Bosch high-pressure common rail.
If it passes
The correct wiring diagram, scan PIDs and service procedure are selected.
If it fails
Do not borrow thresholds or torque values from another generation—the fender badge is not a service manual.
02Cranks but will not startThe starter turns the engine normally, but combustion never takes over.
1
Test
Prove cranking voltage and speed
Load-test the battery bank, voltage-drop positive and ground paths, then compare measured speed with RPM, sync and voltage under crank.
If it passes
Use a fully charged battery bank and confirm a stable RPM PID plus cam/crank sync. The published no-start return benchmark assumes 200 RPM.
If it fails
Repair the weak battery, cable, ground or starter before interpreting pressure data.
2
Test
Confirm position and authorization
Watch RPM, security status and cam/crank sync and injection authorization while cranking.
If it passes
RPM is believable, synchronization is achieved and injection is authorized.
If it fails
Follow the sensor, tone-wheel, wiring, security or module-power path indicated by the missing input.
3
Test
Prove low-side fuel
Measure lift-pump pressure/volume, filter restriction and air at the pump inlet. Test during cranking, not only key-on. Check restriction, aeration and filter sealing.
If it passes
2007.5–2018 field reference: 10–15 psi at the CP3 inlet at idle; verify volume and aeration as well as pressure.
If it fails
Work tank-to-pump in sections. A high-pressure pump cannot make up for an empty, restricted or aerated inlet.
4
Test
Compare commanded and actual pressure
Graph desired versus actual rail pressure through the complete crank event.
If it passes
2007.5–2018: exceed about 4,000 psi while cranking; KOEO should read 0 psi ±500 psi.
If it fails
Separate inlet supply, pressure control, excessive return/leakage and pump output. One low number does not condemn a pump.
5
Test
Check injection and mechanical condition
Use contribution/cutout plus the year-specific return test. If injection conditions are met, verify air shutoff, compression, valve motion and mechanical timing.
If it passes
2007.5–2012: ≤210 mL total return/30 s during the 26,107 psi override at 1,200 RPM; No-start: ≤40 mL/10 s total at 200 RPM.
If it fails
Isolate the failed cylinder/system and prove wiring, injector or mechanical cause before replacement.
03Measured injector return & rail leakage2007.5–2012 CP3 systems. Later engines require their own test setup and limits.
1
Test
1 · Establish a valid collection test
Use graduated containers, a timer, scan recording and the engine-specific return adapters. Identify the injector return separately from pump and relief return. Install tooling with the engine stopped and pressure relieved. Prime before collecting; record temperature, RPM and actual pressure with the sample.
If it passes
The sample contains only the circuit being evaluated, with no air, spilled fuel or unmeasured branches. Continue to test 2 for a no-start, or test 3 for a running engine.
If it fails
Do not compare mixed pump/injector return with an injector-only limit. Correct the hookup or unstable test conditions and repeat.
2
Test
2 · No-start: timed cranking return
Measure combined injector return for 10 seconds at 200 RPM. Keep the same battery state and crank speed between runs. Allow starter cooling between attempts. Record rail pressure at the same time.
If it passes
40 mL or less in 10 seconds meets this return benchmark. If rail pressure still stays below about 4,000 psi, proceed to relief leakage and pump/control isolation; this result alone does not prove pump failure.
If it fails
Over 40 mL/10 seconds: investigate injector internal leakage and connector-tube seating. Isolate with the correct rated service caps, changing connections only with the engine stopped and depressurized. Repeat under identical conditions.
3
Test
3 · Running engine: select the correct limit
For 2007.5–2012, run the fuel-pressure override at 1,200 RPM and 26,107 psi; collect combined injector return for 30 seconds. This is an override test, not ordinary idle.
If it passes
210 mL or less in 30 seconds: continue with relief and pressure-control checks if the complaint remains.
If it fails
Above the matching limit: measure again and isolate the leakage. A hot sample cannot be compared with a cold sample or a different pressure command.
4
Test
4 · Locate the leaking branch
Record total return before and after each approved isolation, holding time, RPM and pressure constant. Check rail-relief return separately during cranking or idle. Inspect connector-tube installation history before ordering injectors.
If it passes
No relief leakage at crank/idle and injector return in range: continue to pump capacity/control. A repeatable fall in return after isolation identifies the branch that needs inspection.
If it fails
Fuel from the relief during crank/idle directs diagnosis to the relief. Excess return from an injector branch can originate at the injector or its connector-tube seat; isolation does not distinguish those by itself.
5
Test
5 · Confirm the result after repair
Restore every return connection and high-pressure fitting using the exact installation sequence. Prime, inspect for leakage without touching pressurized fittings, then repeat the same timed test and hot restart.
If it passes
Return stays within the matching limit, actual rail pressure rises above about 4,000 psi during crank, and the original hot/cold complaint is gone.
If it fails
If the original fault persists, retain the before/after samples and return to the remaining failed branch. Do not keep replacing injectors based on a pressure code alone.
04Low rail pressure, surge & pump capacity2007.5–2012 CP3 capacity test; inlet/pressure screening listed for 2007.5–2018.
1
Test
1 · Validate the rail-pressure signal
With the engine stopped and residual pressure allowed to decay, read rail pressure KOEO. Inspect the sensor connector for fretting, fluid and spread terminals. Graph the signal during a harness wiggle test.
If it passes
Approximately 0 psi, within ±500 psi: proceed to supply testing. A small residual reading is not a pressure-release confirmation for opening the system.
If it fails
Outside that screening window or intermittent: test reference, low reference and signal against the diagram before using the PID to condemn a pump.
2
Test
2 · Measure at the CP3 inlet
Connect the correct low-pressure gauge at the CP3 inlet. At idle expect 10–15 psi; repeat during the fault while recording rail pressure. Check for aeration and filter restriction.
If it passes
Idle supply matches the stated application, fuel is free of air and delivery does not cause rail pressure to collapse. Continue to test 3.
If it fails
Low idle pressure, aeration or restricted delivery: isolate tank pickup, filter, hoses and lift pump. Pressure above the reference band: verify gauge accuracy, regulation and the installed lift-pump requirements before continuing. Aftermarket supply systems must meet their own installation pressure specification.
3
Test
3 · Graph the surge
At warm idle, overlay desired rail pressure, actual rail pressure, engine speed and FCA command. Inspect for cyclic movement greater than about 500 psi; compare the first change in the log.
If it passes
Pressure is stable and follows demand: pursue cylinder contribution or airflow if the engine still shakes.
If it fails
Pressure swings over about 500 psi with the surge: eliminate aeration and relief leakage, then test FCA wiring and response. Oscillation is a diagnostic clue, not a standalone FCA verdict.
4
Test
4 · Prove pump delivery last
After inlet and leak tests pass, a trained technician can run the CP3 outlet-volume procedure with its approved adapter and containment. Collect across three 10-second crank intervals, allowing cooling. Measure the RPM rather than assuming it.
If it passes
At least 70 mL total at 150 RPM, or 90 mL total at 200 RPM, meets this volume benchmark. A volume pass does not establish full-load pressure capacity.
If it fails
Below the matching volume: recheck inlet delivery, actual RPM, control and cascade-overflow circuit before condemning the pump. Do not improvise an open high-pressure discharge test.
052013–2018 · isolate injector and pump returnCP3-equipped 6.7L Ram. These limits do not cover 2019+ systems or pump conversions.
1
Test
Running injector return
Collect injector-only return for 30 seconds during the 26,107-psi, 1,200-RPM fuel-pressure override. Record actual pressure and temperature.
If it passes
210 mL or less: check pump/relief if the complaint remains.
If it fails
Over 210 mL: confirm setup and isolate branches with rated service tooling, changing connections only stopped and depressurized.
2
Test
Compare an isolated branch
Repeat the identical timed test before and after approved injector isolation.
If it passes
A reduction of 40 mL or less does not identify excessive leakage by this benchmark; continue testing other branches.
If it fails
Reduction greater than 40 mL: inspect that injector and connector-tube seat. Isolation identifies the branch, not which sealing surface failed.
3
Test
Keep pump return separate
Collect CP3-only return for 60 seconds at idle; do not combine it with injector return.
If it passes
Under 1,150 mL/min: continue pressure-control diagnosis if needed.
If it fails
At or above 1,150 mL/min: verify inlet delivery and cascade-overflow operation before pump replacement. A low-volume sample at a different speed is invalid.
06Starts, then diesThe engine lights off, runs briefly and shuts down or loses pressure.
1
Test
Record the shutdown
Graph RPM, commanded/actual pressure, supply status, key voltage, run permission and air-shutoff position through the stall.
If it passes
One signal changes first and points to a system.
If it fails
If every PID drops together, inspect ignition feed, module power, grounds and network communication.
2
Test
Watch the supply side
Repeat the event while measuring lift-pump pressure/volume, filter restriction and air at the pump inlet.
If it passes
Supply stays stable after the engine catches.
If it fails
Check a blocked tank vent or pickup, collapsing hose, filter seal, weak lift pump or air entry.
3
Test
Watch pressure control
Compare desired versus actual rail pressure and FCA command, rail relief leakage and pressure-sensor plausibility as it dies.
If it passes
At idle, actual should not oscillate more than about 500 psi from desired; the rail relief should show no leakage at crank or idle.
If it fails
If pressure falls first, isolate leakage, regulator/control and supply. If command disappears first, follow the control reason.
4
Test
Rule out commanded shutdown
Check security, crash/fuel cutoff, PTO/idle shutdown, temperature protection and throttle/air-shutoff commands.
If it passes
No module is requesting shutdown.
If it fails
Resolve the requesting system instead of bypassing a safety strategy.
07Hard start—hot or coldLong crank time, temperature-sensitive starting or restart trouble.
1
Test
Split hot from cold
Log the first cold start and a fully heat-soaked restart using the same PID list.
If it passes
The same system fails in both tests.
If it fails
Temperature-only failure: focus on injector return, rail relief leakage, FCA response and cranking speed, starting aids, viscosity and temperature-dependent leakage.
2
Test
Compare temperature sensors cold
Before starting, compare coolant, oil, intake-air and ambient readings.
If it passes
Sensors agree closely with actual ambient temperature.
If it fails
Test the biased sensor, reference voltage, ground and connector before replacing fuel parts.
3
Test
Measure time to pressure
Overlay cranking speed with desired versus actual rail pressure; note how quickly actual responds.
If it passes
2007.5–2018: exceed about 4,000 psi while cranking; KOEO should read 0 psi ±500 psi.
If it fails
A slow rise points toward drain-back, air entry, inlet restriction, leakage or worn pressure-producing parts.
4
Test
Verify starting aids
Command glow plugs, intake heater or grid heater where equipped; voltage-drop the feed and confirm current draw by bank or circuit.
If it passes
Command, voltage and current are present and balanced.
If it fails
Diagnose the relay/module, feed, ground or elements. Do not judge the system by dash-lamp time.
08Rough run, miss or knockUneven idle, cylinder contribution complaint, sharp knock or intermittent cutout.
1
Test
Define the operating condition
Note cold/hot, idle/in gear, speed, load and whether the noise follows fuel quantity or mechanical speed.
If it passes
The complaint can be reproduced in a controlled window.
If it fails
Use temperature survey and recorded scan data to catch the intermittent event.
2
Test
Find the weak cylinder
Run contribution, balance or cutout testing, then confirm with contribution/cutout plus the year-specific return test.
If it passes
The same cylinder is identified by more than one test.
If it fails
A system-wide pattern points toward fuel quality, pressure control, airflow, timing or voltage—not one injector.
3
Test
Separate injector from cylinder
Pair injector evidence with relative compression, crankcase pressure, valve-train inspection and cylinder temperature.
If it passes
Injector evidence is consistent and mechanical checks pass.
If it fails
Low compression or abnormal valve motion requires mechanical diagnosis before fuel-system spending.
4
Test
Check shared systems
Graph desired versus actual rail pressure, charging voltage and airflow while the miss occurs.
If it passes
Pressure, voltage and airflow stay stable.
If it fails
Multiple bad cylinders usually mean a shared supply, control, ground or air-path problem.
09Black, white or blue smokeUse color, odor, temperature and operating condition as clues—not a verdict.
1
Test
Classify the smoke
Record when it occurs, odor, oil/coolant consumption and whether it changes with cutout, boost or temperature.
If it passes
Fuel, oil and coolant possibilities are separated.
If it fails
Do not assume white means coolant or blue means oil. Verify fluid loss and cylinder response.
2
Test
Black smoke: test air first
Inspect filter/ducts, pressure-test charge air, check pre-turbo exhaust leaks and validate MAP, baro, exhaust pressure and VGT command/position.
If it passes
Measured airflow and boost match command without leaks or restriction.
If it fails
Repair air, EGR, turbo or sensor faults before judging injector quantity.
3
Test
White smoke: test combustion
Verify starting aids, temperature inputs, compression, injection timing/pressure and contribution.
If it passes
Smoke clears warm and no fluid is disappearing.
If it fails
Eye-burning smoke suggests unburned fuel; sweet vapor plus coolant loss requires cooling-system isolation.
4
Test
Blue smoke: test the oil path
Inspect turbo inlet/outlet and drain, crankcase ventilation, oil level and cylinder sealing.
If it passes
No abnormal oil enters intake/exhaust and crankcase pressure is controlled.
If it fails
Correct turbo, drain, ventilation, guide/seal or ring fault before aftertreatment damage follows.
10Low power, no boost or derateTest under the load that creates the complaint. Idle checks rarely prove a power problem.
1
Test
Check for an intentional derate
Save codes and inspect torque-limit reason, aftertreatment status, fuel-pressure protection and transmission requests.
If it passes
No controller is intentionally limiting torque.
If it fails
Repair the initiating condition and complete the required service routine. Do not tune around protection.
2
Test
Prove fuel delivery under load
Log lift-pump pressure/volume, filter restriction and air at the pump inlet, desired versus actual rail pressure and fuel command during a controlled loaded pull.
If it passes
Supply and actual pressure remain on target as demand rises.
If it fails
A value that collapses under load identifies restriction, aeration, control, leakage or capacity direction.
3
Test
Pressure-test the air path
Test compressor outlet to intake, inspect exhaust before the turbine, and compare MAP, baro, exhaust pressure and VGT command/position.
If it passes
System holds pressure and command/position agree.
If it fails
Repair leaks, restriction, actuator/geometry or biased sensors before replacing a turbo.
4
Test
Check exhaust restriction
Review differential pressure, soot load, regeneration history and soot, differential pressure, EGT sequence, NOx and regen history.
If it passes
Restriction is reasonable for operating condition.
If it fails
Find the engine-side reason for repeat loading before cleaning or replacing the filter.
11Fuel supply, pressure control & injectorsTreat low pressure, high pressure and injector return as separate systems.
1
Test
Sample before disturbing
Draw fuel from the housing/tank low point into a clean clear container. Inspect for water, gasoline, DEF, growth and metal.
If it passes
Fuel is clean and correct.
If it fails
Stop and document contamination. Follow the OEM extent-of-repair procedure without circulating more debris.
2
Test
Measure inlet health
Install the correct gauge/restriction tool and verify lift-pump pressure/volume, filter restriction and air at the pump inlet at idle and under demand.
If it passes
Pressure, volume and restriction stay in range without bubbles.
If it fails
Isolate pickup, lines, heater/housing, filter and pump. Fix the inlet before high pressure.
3
Test
Test pressure control
Command or graph FCA command, rail relief leakage and pressure-sensor plausibility against desired versus actual rail pressure. Inspect the harness before removing a regulator.
If it passes
Actual responds smoothly and follows command.
If it fails
Perform the model-year regulator, relief and leakage tests; inspect approved locations for debris.
4
Test
Prove injector performance
Follow the exact service procedure for contribution/cutout plus the year-specific return test. Use approved caps, adapters and return tools only.
If it passes
2007.5–2012: ≤210 mL total return/30 s during the 26,107 psi override at 1,200 RPM; No-start: ≤40 mL/10 s total at 200 RPM.
If it fails
Confirm the suspect with a second test and correct contamination or compression causes before parts.
12Electrical, sensors & no communicationA scan PID is a clue. A meter and wiring diagram prove the circuit.
1
Test
Stabilize system voltage
Load-test each battery separately; voltage-drop main positive and ground paths during crank and electrical load.
If it passes
Voltage remains stable and drops are low on every path.
If it fails
Repair the exact high-drop connection. Replace batteries as a matched set when required.
2
Test
Check module powers and grounds
Use the diagram. Back-probe powers and ground voltage-drop with the circuit loaded—an ohmmeter alone is not enough.
If it passes
Every feed and ground carries load without excessive drop.
If it fails
Repair fuse, relay, feed or ground before condemning a controller.
3
Test
Validate a suspicious sensor
Compare to a related sensor KOEO, then verify 5 V reference, low reference and signal while graphing a wiggle test.
If it passes
Signal changes smoothly and agrees with a mechanical reference.
If it fails
Isolate sensor from harness; unplug shared-reference sensors one at a time if the reference is pulled down.
4
Test
Diagnose no communication
Verify DLC power/ground, measure network bias key-on, resistance power-off, then isolate branches with the diagram.
If it passes
Network values and module list are normal.
If it fails
Locate the shorted/open branch or module by sectional isolation—do not shotgun computers.
13EGR, turbo & aftertreatmentRepair combustion and airflow faults before blaming the DPF or SCR system.
1
Test
Check sensor plausibility cold
With exhaust cold, compare temperature sensors, pressure sensors and ambient inputs before startup.
If it passes
Related sensors agree near ambient and zero differential as designed.
If it fails
Circuit-test the outlier; swap-test only where service information allows.
2
Test
Verify EGR and turbo response
Command devices while watching position feedback, MAF/MAP response and MAP, baro, exhaust pressure and VGT command/position.
If it passes
Feedback follows command and airflow changes logically.
If it fails
Inspect sticking, deposits, leaks, actuator calibration and wiring before replacing assemblies.
3
Test
Find why it is loading
Review soot, differential pressure, EGT sequence, NOx and regen history, regeneration history, idle time and engine-side codes.
If it passes
Loading matches use and regeneration completes normally.
If it fails
Fix injector, boost, EGR, temperature, thermostat or oil-consumption causes before servicing the filter.
4
Test
Perform service routines correctly
Use the proper scan tool for resets, learns, dosing tests and stationary regeneration. Confirm prerequisites first.
If it passes
Routine completes and monitored values respond as expected.
If it fails
Never reset ash or soot counters unless the specified physical service was completed.
14DTC strategy & proof after repairA code names a failed test—not automatically the failed part.
1
Test
Sort the codes
Group voltage/network first, then synchronization, fuel pressure, airflow and aftertreatment. Use freeze-frame to find the first event.
If it passes
One primary fault explains downstream codes.
If it fails
If unrelated modules set low-voltage codes together, return to battery, charging and grounds.
2
Test
Read set conditions
Use exact-year service information for enable criteria, threshold and monitor behavior.
If it passes
The fault can be tested under its actual set conditions.
If it fails
A monitor that cannot run yet cannot be called fixed. Satisfy prerequisites first.
3
Test
Prove the repair
Repeat the original failure window, rerun self-tests and compare before/after recordings.
If it passes
Complaint is gone, monitors run and data stays in range.
If it fails
A cleared light is not a repair. Continue the branch that still fails.
Mechanical reference library
Common specifications & procedures
Application disclaimer: These are common reference specifications. Always look up the current OEM procedure and specifications for your exact vehicle, VIN/engine serial number and installed hardware before performing repairs. Model year, engine revisions and replacement parts can change the requirements. For aftermarket fasteners, follow the current instructions for the exact kit and lubricant.
Choose the exact assembly below. Each entry identifies its hardware, preparation, torque stages and exclusions. This is a reference for the listed operation, not a complete engine rebuild manual.
8 matching procedures. Confirm the full application and installed hardware before using a value.
Valve lash · measure, adjust, recheck6.7L solid-lifter Ram reference: 2010 Ram 5500 chassis cab. Confirm your engine label before applying to another year.
Hardware: Original solid tappets, rocker adjusters and crossheads
- Coolant below 140°F (60°C)
- Intake reset: 0.010 in / 0.254 mm
- Exhaust reset: 0.026 in / 0.660 mm
- Adjuster locknut: 24 N·m / 18 ft-lb (rounded)
Before you start
Disconnect both battery negatives. Clean around the cover before removal. Use a barring tool and feeler gauges; cylinder 1 is at the front.
Procedure
- Bring cylinder 1 to compression TDC. Both #1 rockers must be unloaded; if not, rotate the crank another 360°.
- At this position, measure intake 1, 2, 4 and exhaust 1, 3, 5 between rocker socket and crosshead. Record each reading.
- For a valve requiring adjustment, hold the screw while tightening its locknut; then measure again. A reset target is not the same as the OEM allowable inspection band.
- Rotate the crank 360°. Measure/adjust intake 3, 5, 6 and exhaust 2, 4, 6.
Final check
Recheck all adjusted clearances after locknut torque. Confirm cover clearance, restore the cover and inspect for leakage after startup.
Do not cross-apply
Not a hydraulic-lifter procedure. Do not apply to 2019+ Ram hydraulic valve trains, solid-lifter conversions or aftermarket cams without their instructions. Do not substitute the 5.9L exhaust setting.
Factory cylinder-head bolts · staged tightening2010 Ram 5500 6.7L, original cylinder head and OEM bolts
Hardware: Matching original-equipment head bolts; not aftermarket studs
- Seat: 70 N·m / 52 ft-lb
- Back off 360° in sequence
- Tighten: 105 N·m / 77 ft-lb
- Recheck: 105 N·m / 77 ft-lb
- Final: additional 90°
Before you start
Use the correct new gasket, properly seated on the dowels. Clean the bolt holes. Lightly oil the bolts with engine oil; the 6.7L procedure specifies threads and under-head surfaces. Check OEM bolt inspection/replacement requirements.
Procedure
- Have the matching numbered head-bolt diagram in front of you. Complete the 70 N·m seating pass before backing every bolt off one turn in sequence.
- Tighten every bolt to 105 N·m in sequence, then repeat that torque check across the whole head.
- Apply the final 90° to every bolt in sequence using an angle gauge. Do not replace the angle stage with an estimated final torque.
Final check
Record completed passes. Reinstall the valve train using its own specifications and recheck lash. Stop for damaged threads, abnormal rotation or a bolt that will not clamp.
Do not cross-apply
Do not substitute a generic 66 ft-lb recipe, 12-valve long-bolt stages or ARP torque. Confirm other years, replacement heads and superseded bolts separately.
24-valve head studs · ARP 247-42025.9L/6.7L 24-valve Cummins with this exact ARP kit and matching cylinder head
Hardware: ARP 2000 kit 247-4202
- 40 → 80 → 125 ft-lb
- Approximately 54 → 108 → 169 N·m
Before you start
Clean M12 × 1.75 block threads. Install studs by hand without tightening them into the block. Use ARP Ultra-Torque on nut threads and bearing surfaces; kit 247-4202 specifies both washer faces.
Procedure
- Put the 6.625-inch studs on the exhaust side at sequence positions 3, 6, 11, 14, 19 and 22. Use the kit's numbered diagram.
- Finish each torque stage across positions 1–26 before the next stage. Verify lower rocker-cover clearance at position 24; machining is required by the kit instructions.
Final check
Confirm the correct kit, lubricant, full thread engagement and free cover fit. Keep the torque record with the build.
Do not cross-apply
Do not use this torque with stock bolts, another ARP material, dry threads or engine oil in place of Ultra-Torque.
24-valve head studs · ARP 247-42045.9L/6.7L 24-valve Cummins with this exact ARP kit and matching cylinder head
Hardware: ARP Custom Age 625+ kit 247-4204
- 50 → 100 → 150 ft-lb (three equal stages)
- Approximately 68 → 136 → 203 N·m
Before you start
Clean M12 × 1.75 block threads. Install studs by hand without tightening them into the block. Use ARP Ultra-Torque on nut threads and bearing surfaces; kit 247-4202 specifies both washer faces.
Procedure
- Put the 6.625-inch studs on the exhaust side at sequence positions 3, 6, 11, 14, 19 and 22. Use the kit's numbered diagram.
- Finish each torque stage across positions 1–26 before the next stage. Verify lower rocker-cover clearance at position 24; machining is required by the kit instructions.
Final check
Confirm the correct kit, lubricant, full thread engagement and free cover fit. Keep the torque record with the build.
Do not cross-apply
Do not use this torque with stock bolts, another ARP material, dry threads or engine oil in place of Ultra-Torque.
Factory damper · 2010 6.7L reference2010 Ram 5500 6.7L, original damper and crank attachment
Hardware: OEM crankshaft damper bolts
- 40 N·m / 30 ft-lb, then additional 60°
Before you start
Confirm OEM bolt replacement requirements and thread preparation. Seat the damper on its locating feature.
Procedure
- Tighten the bolts in the OEM sequence to 40 N·m.
- Apply the additional 60° with an angle gauge.
Final check
Check seating, completed angle stages and belt alignment.
Do not cross-apply
Not the Fluidampr or aftermarket high-strength bolt-kit procedure.
Damper / crank attachment · Fluidampr2007.5–2018 6.7L Ram with Fluidampr 920321
Hardware: Listed Fluidampr damper with new OEM bolts: 920321
- 92 ft-lb / ≈125 N·m
Before you start
Verify the exact damper and bolt set. Clean pilot and mating surfaces; confirm correct bolt engagement and installation tooling.
Procedure
- Seat the damper fully. Torque using the matching OEM sequence and the value above; measure any angle stage with an angle gauge.
Final check
Check pulley alignment, belt clearance and fastener completion before running.
Do not cross-apply
Not for aftermarket high-strength bolt kits or another damper assembly. Never add a torque-to-yield angle a second time as a recheck.
Factory flywheel / drive plate to crankshaft6.7L reference: 2011 Ram 5500 chassis cab, factory flywheel or converter drive plate and clamping ring
Hardware: Matching original-equipment crank attachment bolts and factory stack
- 137 N·m / 101 ft-lb
Before you start
Identify the transmission and actual flywheel/adapter. Support the assembly, clean the mating faces and verify bolt length, washers/clamp ring, thread preparation and replacement requirements in the installation procedure.
Procedure
- Start every correct bolt by hand and use the specified crank-holding tool.
- Tighten progressively in the matching OEM sequence to 137 N·m. Check that fasteners clamp the joint rather than bottom in the crank.
Final check
Check seating, clearance and the specified runout before reinstalling the transmission.
Do not cross-apply
Not the pressure-plate screws, torque-converter bolts or an aftermarket conversion-flywheel specification.
BD flexplate · exact transmission kit2007.5–2018 6.7L Ram with 68RFE and BD 1041221
Hardware: Eight factory crank bolts; correct converter bolts and original stack components
- Flexplate to crank: 100 ft-lb / ≈136 N·m
- Converter attachment: 65 ft-lb / ≈88 N·m
Before you start
Record shim/washer order during removal. Reinstall the factory steel washer and any specified shims in the illustrated order for your truck.
Procedure
- Install the plate and torque the eight crank bolts in a crisscross pattern.
- When using a BD converter, use the converter's supplied bolts. Confirm converter seating and clearance before fastening it to the plate.
Final check
Confirm all attachment bolts, free rotation and correct converter spacing before startup.
Do not cross-apply
BD 1041221 does not fit 2019+ trucks. Not an Aisin or G56 specification.
Known failure directions
Common is a place to test, not permission to replace.
- Fuel contamination
- Restricted filters/air entry
- Excess injector return
- Rail relief/control leakage
- Turbo actuator/soot
- Combustion-caused DPF faults
What to send the shop
Year, engine or RPO, cold or hot, all codes, freeze-frame, cranking log, fuel sample findings, recent work and which tests passed or failed.
Call (915) 247-2782