Jeep Wrangler/YJ 1987-1995 Repair Guide

Crankcase Vent Filter


See Figure 1

All 1987-90 4.2L engines that are equipped with a PCV system have a crankcase vent filter located inside the air cleaner. This element is used to filter the outside air before it enters the crankcase through the PCV system. Inspect the filter periodically along with the air cleaner element and replace as necessary.

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Fig. Fig. 1: Rotate the retainer (1) to remove the crankcase filter (2) from the air cleaner housing