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Old 21-03-2011, 06:24   #1
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Yanmar Crankase Pressure

Just curious....is there any thing else other than bad rings that would do that?

I picked up a running take out.....ran it on a pallet....fine no smoke.....put it in...now I have all kinds of pressure in the crankcase and lotsa smoke
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Old 21-03-2011, 07:32   #2
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Re: Yanmar Crankase Pressure

Plugged PCV valve breather?
Scored cylinder?
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Old 21-03-2011, 11:25   #3
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Re: Yanmar Crankase Pressure

what motor?
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Old 22-03-2011, 15:53   #4
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Re: Yanmar Crankase Pressure

Raw water cooled Yanmar 2 GM
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Old 22-03-2011, 16:32   #5
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Re: Yanmar Crankase Pressure

there is the remote possibility of a cracked head / head gasket allowing combustion pressure back in through the push rod area
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Old 22-03-2011, 19:42   #6
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Re: Yanmar Crankase Pressure

Piece of piston broken off.
Ask me how I know.
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