dissturbbed
New member
1978 mercruiser gm 153 ci 120 hp= I am pulling the motor because the coupler went out due to poor alignment and since ill have the engine out might as well replace the seal. I have done many front seals on vehicles but not any rear main seals. The shop manual i have states how to replace it with the engine apart, is it possible to replace the rear main oil seal without doing a major overhaul? One more question, do these seals come in two separate parts or one?