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Original Message
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| RE: Oil Blow-By |
| By gerry - 11/01/2000 11:45:49 AM; IP 208.217.67.189 |
Blowing oil out the breather isn't normal, Tim. It means that you have too much oil in the valve cover (if you have valve cover breathers), or your breather isn't baffled, or that you have poor ring seal.
Obviously, you want to rule out the simple stuff first, so check for excessive oil in the top of the engine and that your breathers are baffled.
If that looks up to snuff, then I suggest you have a leak-down test done on the cylinders. This is different from a compression test as it gives you a precise indication of how well your compression rings are sealing the cylinder.
I'm assuming you are using a PCV, and that the system is performing properly. If not, then some oil blowby would be expected under higher rpm running. Any engine will mist under these conditions. You can eliminate this just about entirely by running a completly closed system (PCV and air cleaner pick-up). Of course, the engine has to be otherwise in good condition. |
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