Base Engine Misfire with Abnormal Valve Train Noise

Engine Mechanical - 3.0L LM2 Diesel | Diagnostic Information and Procedures | Document ID: 5132684

Cause	Correction
Worn or loose rocker arms The rocker arm bearing end caps and/or needle bearings should intact within the rocker arm assembly.	Replace the valve rocker arms as required.
Stuck valves Carbon buildup on the valve stem can cause the valve to not close properly.	Repair or replace as required.
Excessively worn or mis-aligned timing chain	Replace the timing chain and sprockets as required.
Worn camshaft lobes	Replace the camshaft and valve lash adjusters.
Sticking valve	Replace as required.
Worn or damaged pushrods	1. Inspect the pushrods for excessive wear, bent condition or broken tip. 2. Replace as required.
Broken valve springs	Inspect valve springs and replace as required.
Excessive valve lash	Inspect the valve lash adjusters and replace as required.