Mechanics

ENGINE NIOSE

1989 Plymouth Voyager

Noises problem
1989 Plymouth Voyager 4 cyl Front Wheel Drive Automatic 170000 miles

GUYS, iT SOUNDS LIKE SOMETHING SPINNING AT ENGINE SPEED HITTING A NON-MOVING OBJECT IN THE VALVE TRAIN ON MY 2.5l MOTOR. IT IS COMING FROM THE PASSENGER SIDE. I WAS TOLD IT IS A LIFTER, BUT FROM ALL THE PIC'S I CAN FIND THERE ARE NONE, ONLY ROCKERS WHICH ON THE VALVE STEM. WHAT DO YOU THINK?
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Argos
November 28, 2008.



ROCKER ARM ASSEMBLY
Install hydraulic valve lash adjusters and rocker arms in original positions. Measure rocker arm-to-valve stem installed height between projecting ears of rocker arms on either side of valve stem tip and valve spring retainer. Minimum clearance is .050" (1.27 mm). If clearance is not sufficient, grind rocker arm ears as required.
HYDRAULIC VALVE LASH ADJUSTERS
NOTE:Lash adjusters are serviced as complete assemblies only. Parts are not interchangeable.

Adjustment of lash adjusters is not required. Servicing of adjusters requires only care and cleanliness in handling of parts. If disassembled for cleaning purposes, reassemble using new spring clip. Adjusters must be full of oil prior to installation and oiling holes in cylinder head must be free of obstructions.
DRY LASH MEASUREMENT
Dry lash is amount of clearance between installed camshaft base circle and rocker arm pad. Valve lash adjuster must be completely collapsed and free of oil when checking clearance.
Remove retainer cap from valve lash adjuster. Disassemble and drain oil. Install adjuster when completely collapsed. Using feeler gauge, measure clearance between camshaft base circle and rocker arm pad.
Clearance should be .024-.060" (.62-1.52 mm). If not within specifications, check for wear on related parts and replace as required. Fill adjusters with engine oil. Reassemble using new retainer cap. Allow 10 minutes for adjusters to bleed down before rotating camshaft.


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Dave H
Dec 1, 2008.