Oldsmobile Engine >> REAR MAIN SEAL ALTERNATIVE (REVISED)
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Oldsmobile Engine >> REAR MAIN SEAL ALTERNATIVE (REVISED)
Rubber Rear Main Seal Alternative On
General Motors (Oldsmobile) V8 Engines
A rubber alternative to the rope rear main seal found in all GM (Oldsmobile) V8 engines can be made from the rubber rear main seal designed for Chrysler (AMC) 3.2L-4.2L (199-258 CID) engines and the seal designed for the Ford Motor Company 7.0L-7.5L (429-460 CID) engines.
McCord Gasket Corporation engineers report that the rubber seal for the Chrysler (AMC) 6 cylinder engine can be used in several GM Oldsmobile V8 engines by trimming off the tabs on the upper half of the AMC seal (see illustration below).
When modified, both halves of the AMC seal will be equal and will properly fit in the seal cavity of the Oldsmobile blocks. The AMC seal will fit Oldsmobile-built 4.3L, 5.0L and 5.7L (260, 307 and 350 CID) engines (gas only) once the seal has been modified.
The Ford 7.0L-7.5L (429-460 CID) engine seal will fit the 6.6L (400, 425, 455 CID gas) and 5.7L (350N CID) (diesel) engines with no modifications necessary to the seal.
AERA members should keep in mind that these modifications have not been authorized by GM (Oldsmobile). Tests in the field have shown great success, however.
The AERA Technical Committee
April 1986 - SB 128R
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