Hydraulic lifters, checking
WARNING: This page is about a different variant/trim than selected.
Special tools and equipment
- Feeler gauge
- Wood or plastic wedge
NOTE:
- Replace each faulty hydraulic lifter complete only (cannot be adjusted or serviced).
- Irregular valve noises when starting engine are normal.
Work sequence
- Start engine and run until coolant fan has switched on once.
- Increase engine speed to about 2500 rpm and hold for approx. 2 minutes.
If the hydraulic lifters are still noisy, locate faulty lifters as follows:
- Remove intake manifold upper part. Refer to Intake manifold upper part, removing and installing .
NOTE:
Seal the intake ports in the intake manifold lower section with clean cloths.
- Remove cylinder head cover.
- Rotate crankshaft clockwise, until cam of lifter to be checked is pointing up.
- Determine clearance between cam lobe and hydraulic lifter.
If the clearance is greater than 0.2 mm:
- Replace hydraulic lifter.
If clearance is less than 0.1 mm or no clearance exists, proceed with check as follows:
- Push hydraulic lifter down lightly with a wooden or plastic wedge. If when lifter is pushed down a 0.2 mm thick feeler gauge can be pushed between camshaft and lifter, lifter must be replaced.
NOTE:
When new lifters have been installed the engine must not be started for about 30 minutes. The hydraulic compensation elements must settle or the valves will strike the pistons.