← Back

Failure mode - Ford 6.4L Power Stroke

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

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) ()

• rocker-arm-kit (part category - specific model not chosen)

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