Gentleman, this subject valve adjustment is located in the Ask Dave technical section on the
forum under Ask Dave. There are many different ideas as to when to adjust the overhead on
you C-12 engine. Let me post this information again ( Between 15,000 and 60,000 miles )
Compression Brake - Inspect/adjust Note: The slave piston lash adjustment must be preformed
after engine valve lash is preformed.
Electronic Unit Injector - Inspect/Adjust. Adjust the electronic unit injector at same interval as
the valve lash adjustment. Note: in proper adjustment of electronic unit injector can reduce that
power and result in excessive fuel usage and/or shorted engine component life.
Engine valve lash - Inspect/Adjust
Only qualified service personnel should preform these operations
Next PM Level 3 Inspection ( 300,000 miles )
Compression Brake - Inspect/Adjust/Replace
Electronic Unit Injector Inspect/Adjust
Engine Valve Lash - Inspect/Adjust
Same time the following:
Turbocharger Inspect
Crankshaft Vibration Damper- Inspect
Air Compressor - Inspect
Dave Atherton Retired Cat Mechanic