Aerostar 2WD V6-245 4.0L (1990)
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If no bubbles are detected, but oil is present in the area between the crank hub and the lip of the rear seal, carefully remove the seal and
inspect the crankshaft rear seal journal. (A leak may occur at the rear seal only when the engine is running.) Note Procedure A, Figure 2,
Step A3/F3, and pictorial, Figure 5. Follow repair procedures outlined on the block diagram.
NOTE:
ANY APPEARANCE OF RUST, PITTING, POROSITY, OR NICKS ON THE REAR SEAL JOURNAL WILL CAUSE A LEAK.
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If bubbles are detected at the front or rear of the intake manifold gasket, a new intake manifold gasket (FOTZ-9439-A) will have to be
installed. Proceed to SERVICE PROCEDURE - REPAIR FOR OIL LEAKS AT INTAKE MANIFOLD, PROCEDURE B.
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If bubbles are detected at the rocker cover rails, new rocker cover gaskets (F3TZ-6584-A) will have to be installed. Proceed to
SERVICE PROCEDURE - REPAIR FOR OIL LEAKS AT ROCKER COVER RAILS, PROCEDURE C.
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If bubbles are detected at the front end of the engine, a new front seal (E6TZ-6700-A) or oil pan gasket (FOTZ-6710-C) will be
required. Proceed to SERVICE PROCEDURE - REPAIR FOR OIL LEAKS AT THE FRONT END, PROCEDURE D.
Service Procedure - Repair
REAR END OIL LEAK - PROCEDURE A
