Hydraulic Valve Lifters, Checking

Hydraulic Valve Lifters, Checking

Special tools, testers and auxiliary items
^ Feeler gauges
^ Wood or plastic wedge

Note:
^ Replace hydraulic valve lifters only as complete units (they can not be adjusted or repaired).
^ Some irregular valve train noise during start up is normal

Checking

- Run engine until radiator coolant fan comes on at least once.

- Increase engine speed to approx. 2500 RPM for 2 minutes.

If the lifters are still noisy, locate defective lifters as follows:

- Remove upper intake manifold and cylinder head cover.

- Turn crankshaft by hand with crankshaft drive belt sprocket bolt in clockwise direction until cam lobe for lifter to be checked faces upward.

- Check play between cam and lifter with a feeler gauge.

If the play exceeds 0.1 mm (0.004 in.):

- Replace valve lifter.

If there is less than 0.1 mm (0.004 in.) play, or no play, check as follows:





- Press down with suitable non-marring tool (e.g. wood or plastic).

If the lifter can be pushed down more than 0.1 mm (0.004 in.) before valve starts to open:

- Replace valve lifter.

CAUTION!
After installing new hydraulic valve lifters, DO NOT start the engine for approx. 30 minutes in order to allow the lifters to bleed down. Otherwise there is danger of the valves being damaged by interference with the pistons.