Black Oil, Due To EGR system?
- Thread starter Henro
- Start date
I think you will be looking for a long time to find an EGR tube on your tractors no matter what side you tip it on
he pulled my response to Henro who stated
I was just trying to help Henro, because the title and his posts were kind of confusing a bit.
I appreciate that!
I did mess up in the post title, and a bit in other posts as well, as nothing related to either the EGR or PCV circuits makes any sense regarding making the oil black...
Now maybe if an exhaust valve guide was leaking exhaust gases into the valve cover, this might theoretically help to darken the oil, as these gases would find there way past oil as they travel along the way into the PCV path...
In reality, is it fair to assume that black oil is the result of blow by exclusively?
If one engine has slower darkening of the oil than another, after the same period of use, is it likely that the engine with cleaner oil has piston rings that seal better than those in the other engine?
Other than blow by past the piston rings, is there any other reason that might cause engine oil to darken?
You also need to remember part of the oil rings job is to apply and scrape oil off the cylinder wall, this oil is in the combustion chamber during a burn event. A burn event is a much longer affair in a diesel then a gas engine. So it's not just "blow by" exclusively. Contributing to the oil color. The tighter engines will show less of it.
Worn valve guides typically present as an oil loss issue not going to make the oil much darker from the minimal amount that gets back past them.
Worn valve guides typically present as an oil loss issue not going to make the oil much darker from the minimal amount that gets back past them.
Appreciate the insight. Always trying to learn more as time goes by...