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The two stages of the gerotor oil pump are clearly visible in the GM cutaway. The pump is driven directly off the crank snout, eliminating auxiliary drives from the camshaft.
Mechanical Mastery

 The two stages of the gerotor oil pump are clearly visible in the GM cutaway. The pump is driven directly off the crank snout, eliminating auxiliary drives from the camshaft.  View Related Article

 

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