Quote:
Originally Posted by JimZ
I've been reading up on blow-by in here, but I'm not sure if that's what I was seeing...
When I did a diesel purge this weekend, I noticed, sitting in the car with the hood up, that when I reved it pretty high I would start getting smoke coming from somewhere in the engine. It looked like it was somewhere around the air filter. Is this blow-by? Or if not, what is it and should I be concerned?
I'm realizing as I write this that I should have checked if that arm off the air filter is on there right.
Any thoughts?
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Blow-by is oil "blowing by" the rings or valve stem seals. It results in blue smoke out of the exhaust pipe. The oil is getting in the combustion chamber and being burned by the engine which makes the blue smoke. If you suspectg blow by you can do a leak down test to determine if it is the rings or not. If it is the rings, you are looking a an engine rebuild. If it is through the valve seals, you may be able to just replace the seals. But if the valve guides are worn, you will need a vavle job.
How much oil is it losing between oil changes? Is it leaking oil also? If it is not losing oil than you have no blow-by.