Ford Full-Size Cars 1968-1988 Repair Guide

Crankcase Filler Cap


See Figure 1

At the recommended intervals in the maintenance interval chart, the oil filler cap must be cleaned. Disconnect the positive crankcase ventilation hose from the cap and lift the cap from the rocker cover. Soak the cap in kerosene or mineral spirits to clean the internal element of sludge and any blow-by material. After agitating the cap in the solution, shake the cap dry. Reinstall the cap and connect the hose.

Click image to see an enlarged view

Fig. Fig. 1: Exploded view of a PCV system used on later models