DIESEL/LOW ENGINE OIL PRESSURE VALVE LIFTER BORE CLEARANCE. Buick Electra Estate Wagon 1983

For 1990-2009 cars

# DIESEL/LOW ENGINE OIL PRESSURE VALVE LIFTER BORE CLEARANCE

#### Models Affected: 5.7L (V-8) and 4.3L (V-6) Diesel Engines

Low oil pressure on a diesel engine can be caused by valve lifter clearance due to wear. The wear may occur in the upper end of the bore although the lifter ususally wears more than the bore. To determine if wear has occurred measure the upper end of the lifter in two spots, where it contacts the bore, parallel with the roller and 90 DEG to the roller. Refer to illustration. Wear of .005 to .008 inches is enough to cause low oil pressure and the lifter should be replaced.

Measure the lifter bore in the block. Wear should not exceed .003 inches. If it is necessary to replace the lifters, stone the sharp edges on the bearing shoulder area of the new lifters as shown in illustration, before installation in the lifter bore.

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