1972 350 Chevy Pickup Engine
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A classic assembly boo-boo is installing the rear main seal backwards and causing a massive oil leak. Here the pen points out the raised lip of the seal, which always faces inboard toward the oil. A thin coat of Gasgacinch sealant was applied beneath the rubber seal inserts in the block and in the ream main cap. A small dab of self-drying Permatex Number 1 at the edges of the seal offers further leak prevention. Applying too much will foul the rubber seal and forge an oil-leak path. View Related Article
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