Regal V6-191 3.1L (1991)
Intake Manifold: All Technical Service Bulletins
Engine - Oil Leaks
Bulletin:
91-6-7
Date:
June '91
Ref. No.: 91-182-6
Corp. Ref. No.: 136508
SUBJECT:
ENGINE OIL LEAKS (DIAGNOSIS/APPLY NEW RTV SEALER AT FRONT AND REAR OF MANIFOLD)
MODELS AFFECTED: 1990-91 REGALS WITH 3.1L V6 ENGINE (VIN CODE T)
THIS BULLETIN IS BEING REVISED TO CORRECT BULLETIN NUMBER.
CONDITION:
Oil leaks on the 3.1L V6 engine (VIN Code T) may be misdiagnosed as head gasket failures. However, these leaks may be occurring at the front or rear
of the intake manifold where it contacts the cylinder block.
CAUSE:
Leaks may be due to an insufficient quantity of RTV sealer (where the intake manifold cylinder block and cylinder head meet) at the front or rear of the
intake manifold.
CORRECTION:
Use normal diagnostic measures to determine if the oil leak is at the front or rear of the intake manifold to cylinder case ridge. If a leak is found, use
service manual repair procedures and clean RTV sealant from front and rear ridges on intake manifold and cylinder case. Apply new RTV sealer, P/N
1052917 (or equivalent) and reassemble intake manifold per service manual.
The sealing bead must run-up the cylinder head face approximately 3/16 of an inch at both ends of the front and rear cylinder block ridges.
Parts are currently available from GMSPO.
