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post #11 of 13 (permalink) Old 05-10-2019, 10:12 AM
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I'm following this thread too. From your description you're definitely getting cylinder pressure in the cooling system. No doubt about that. In my experience its always the head gasket does that but the way that engine is made I suppose it could have a cracked head or cylinder. I'd expect some coolant seeping into the crankcase though. I don't know if there's any way for pressure to get between the case halves into the coolant??
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post #12 of 13 (permalink) Old 05-11-2019, 11:31 AM
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The water pump is self contained, bolted to the back side of the crankcase cover and is located inside the oil chamber for the counter balance - I see no way for crankcase compression to get into the water jacket unless the engine has multiple problems and is in need of a complete and thorough professional rebuild - not a job for the average owner. (And I have never seen a cracked cylinder or cylinder head on any liquid cooled aluminum engine that did not suffer a catastrophic piston or crankshaft failure or having been assembled incorrectly by an inexperienced mechanic)

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Last edited by latebird; 05-11-2019 at 01:06 PM.
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post #13 of 13 (permalink) Old 05-11-2019, 12:50 PM
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Quote:
Originally Posted by latebird View Post
The water pump is self contained, bolted to the back side of the crankcase cover and is located inside the oil chamber for the counter balance - I see no way for crankcase compression to get into the water jacket unless the engine has multiple problems and is in need of a complete and thorough professional rebuild - not a job for the average owner. (And I have never seen a cracked cylinder or cylinder head on any liquid cooled aluminum engine that did not suffer a catastrophic piston or crankshaft failure or having been and assembled incorrectly by an inexperienced mechanic)
Yep, I'm curious to hear about what he finds.
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