Rear Crankshaft Oil Seal/Dipstick Tube - Leaks Oil

Article No.
94-3-6

02/09/94

LEAKS - OIL - 3.0L - AT THE REAR CRANKSHAFT OIL SEAL AND/OR AT ENGINE OIL DIPSTICK TUBE

LIGHT TRUCK:
1987-91 AEROSTAR

This TSB article is being republished in its entirety to include 1991 model-year vehicles.

ISSUE:
Oil leaks at the rear crankshaft oil seal or the engine oil dipstick tube may be caused by excessive pressure in the engine crankcase. This occurs because ice forms in the PCV closure hose in ambient temperatures of -4~F (-20~C) and below.

ACTION:
Install a filter and tee assembly in the crankcase ventilation closure hose. Refer to the following procedure for service details.





1. Remove the crankcase ventilation closure hose from the truck, Figure 1.

2. Cut a 1-1/8" (28.6 mm) piece out of the crankcase ventilation closure hose. Make the cut 4" (101.6 mm) from the air cleaner end of the hose.

3. Install the filter and tee assembly (FO9Z-6C652-A) to both ends of the cut tube, Figure 1.

4. Re-install the crankcase ventilation closure hose, filter and tee assembly with the filter in the vertical DOWN position.

PART NUMBER PART NAME CLASS
F09Z-BC652-A Filter & Tee Assembly B

OTHER APPLICABLE ARTICLES: None
SUPERSEDES: 90-23-16
WARRANTY STATUS:
Eligible Under Basic Warranty Coverage, Emissions Warranty Coverage

OPERATION DESCRIPTION TIME
940306A Install Filter & Tee 0.3 Hr.
Assembly

DEALER CODING
BASIC PART NO. CONDITION CODE
6A664 49

OASIS CODES: 401000