Engine - Oil Leaks From Rear of Engine
TSB # SB07-01-S004Issue Date: MARCH 2007
Subject:
Engine Oil Leak At Rear Cover Assembly Area
(This Bulletin Supersedes SB06-01-S003)
Affected Vehicles:
2003-2006 Isuzu Ascender (US) with 5.3L Engine
Service Information
This Bulletin is being updated to add information to the Service Procedure.
Condition:
Some customers may comment on an engine oil leak.
Possible Cause:
Upon initial diagnosis, it may be determined that the leak is coming from the rear cover gasket. This condition may be caused by engine block porosity on the sealing surface.
Correction:
Follow the steps for Oil Leak Diagnosis in the Service Manual to determine the source of the leak. If the leak has been diagnosed as coming from the rear cover assembly, remove the rear cover assembly and inspect for engine block porosity where the rear cover mates to the engine block. If porosity is found anywhere on the sealing surface, use the following procedure to apply RTV to repair the engine block porosity (refer to illustration shown).
Service Procedure
IMPORTANT:
Clean any residual oil from the block and cover before applying the sealant in the next step.
1. Wipe a small amount of RTV, P/N 8-12378-521-0 onto the surface using a plastic scraper to fill the porosity.
2. Remove any excess RTV material, especially from inside the high pressure oil passage as shown in illustration.
3. The joint may be closed immediately after applying the RTV. Total joint time after the RTV has been applied must be under 20 minutes.
IMPORTANT:
Refer to Engine Rear Cover Replacement in the Service Manual and follow the tightening specifications and sequence.
4. Reinstall the rear cover using a new gasket and follow installation instructions found in the Service Manual.
Parts Information
Warranty Claim Information
Use the labor operation table shown.
NOTE:
1. Labor Time includes administrative time allowance.
2. Information released on paper and electronic format prior to bulletin release cannot be updated. For the most current and up to date information refer to IsuzuONE.com
3. Always refer to the Isuzu Service Policy Procedure Manual for specific details on warranty coverage and policies.
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