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 belt

Replace the timing belt and sprockets as required.

Worn camshaft lobes

Replace the camshaft and valve lash adjusters.

Sticking valve

Replace as required.

Worn or damaged pushrods

Inspect the pushrods for excessive wear, bent condition or broken tip.

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.