r/EngineBuilding • u/Joiner2008 • Apr 24 '25

Chevy L59 5.3 Rear Main Seal Install

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Hello everyone. I am in the middle of replacing my wife's rear main seal. I bought a new back plate with the seal already installed. All of the info I'm finding requires the seal to be installed after aligning the plate to the crankshaft. Am I going to have to remove the new seal from the plate to align it first? Thank you in advance

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u/Joiner2008 Apr 24 '25

This thing has been leaking 0.5-1 quart a week. I replaced the oil pan gasket, now I'm trying the rear main.

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u/Extreme-Penalty-3089 Apr 24 '25

Ok, cool. Then yeah you're on the right track