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Regular Contributor

Re: Engine blowby

Are you losing coolant ? To have both blowby and exhaust smoke sounds like a piston problem. Still suggest taking the head off the compressor to check all is good before pulling the cylinder head off.

New member

Re: Engine blowby

Thank you for replying. The air compressor has been rebuilt like 2 months ago. There is just a lot of smoke coming from the blowby tue and the exhaust.
Regular Contributor

Re: Engine blowby

if your air compressor has failed it can push oil into the cooling system and if there is a hole in one of the air compressor pistons from the failure then this lets boost pressure push into the crankcase and come out the crankcase breather as apparent blowby. not sure on the power / speed issue but with a large loss of boost pressure then the ECM will limit the fuel to FR (Fuel Ratio) limit and not allow you to get to Rated (max) fuel limit.

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New member

Engine blowby

How’s it going everyone, so I recently changed out an oil cooler in a Cat C-12 because there was oil in the coolant reservoir, so got that put on and now the truck has intermittent power sometimes it will go up to 20mph then it won’t even go up to 10 mph. And there is a lot of blowby coming out. I’m not sure what to do?