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Old 05-26-2015, 07:04 PM   #12
DavidM
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City: Litchfield, Ct
Join Date: Aug 2012
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To offer a little different take on your question: the core of marine recreational engines rarely wear out. That is their bearings don't wear and cause the oil pressure to be chronically low or the rings wear and burn lots of oil.

They die from neglect, lack of maintenance and the ravages of the marine environment. The stuff that was added to make it a marine engine is what really goes before the core engine wears out. These are the exhaust manifold, raw water injection elbow, raw water pump, raw water heat exchanger, etc.

On a Lehman or its sister the Perkins 6.354 some of these items are somewhat difficult to find, are costly and sometimes faced with the compromises of replacing a broken marine part with a used marine part you just say: f*&^-it and repower the boat with a new engine.

FWIW the John Deere 4045 engine on Mark's boat (pictures above) would be a good replacement for an abused Lehman. The JD costs about $20K plus installation.

David
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