Posted by Steve@Advance on June 21, 2019 at 13:58:37 from (66.169.147.211):
In Reply to: Engine Blow By posted by Stoneman44 on June 21, 2019 at 12:57:56:
Some things to look for...
Blowing so hard that oil is being carried out the vent tube is generally not good.
Seeing a pattern where one cylinder is puffing more than the others.
Blowing exceptionally more under load. Some increase is normal, but a drastic increase is not.
All 4 cylinders will "breathe" through the crankcase vent. It's normal for oil vapor, even splash oil to come out the oil cap if opened when running.
If there is a vent tube returning to the air cleaner, and there is evidence of oil coming out the tube, not a good sign. But it could also just be a clogged PCV system if so equipped.
Also, an engine that is heavily carboned, as in looking in the oil cap, is "probably" a sign of worn rings, and/or poor maintenance. That applies more to later model engines, not so much to the older, pre detergent oil models.
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