← Back
Failure mode - Ford 6.4L Power Stroke Diesel
Rocker arm tip wear
Reliability tier: aggregated - verify before ordering, see /disclosure/
Symptoms
- valve-train tick that grows with mileage (typ. 100-150k)
- injector contribution codes from lost motion
- wear found at service on tips/roller ends
Compare with the other causes of the same sign on this engine: ticking, knocking, rattle or whine (2 causes)
Root cause
The sourced history names rocker-arm tip wear at 100-150k miles as a known 6.4 wear item - a maintenance-plane mode, not a catastrophic one, until ignored long enough to valve-train noise and misfires.
Diagnosis
- stethoscope/valve-cover-off inspection of tips at high-mileage services
- cylinder-balance test for contributing holes
- check pushrods/rollers while in there
Fixes
replace rocker arms (sets available; upgrade designs from specialists) ()
Prevalence
common
Affected configurations (12)
- 2008 Ford F-250 Super Duty
- 2008 Ford F-350 Super Duty
- 2008 Ford F-450 Super Duty Chassis Cab
- 2008 Ford F-550 Super Duty Chassis Cab
- 2009 Ford F-250 Super Duty
- 2009 Ford F-350 Super Duty
- 2009 Ford F-450 Super Duty Chassis Cab
- 2009 Ford F-550 Super Duty Chassis Cab
- 2010 Ford F-250 Super Duty
- 2010 Ford F-350 Super Duty
- 2010 Ford F-450 Super Duty Chassis Cab
- 2010 Ford F-550 Super Duty Chassis Cab