2nd Gen Non-Engine/Transmission Excessive Blow-by

[BHiggins]

I'm a 1st gen guy but my friend has a 2nd gen he thinks may have a problem. On his truck (a 1998 CTD, I believe a 12 valve but not 100% sure, with approx 50,000 miles) there is a "catch can" under the blow-by tube. The can fills up frequently, too frequently to be considered normal in my opinion, it fills up after a couple of thousand miles if he takes a long trip. It runs fine, normal power, milage etc. How much oil normally accumulates in the can on other 2nd gen trucks? Is his blow-by normal?

 

[TRCM]

It may be excessive, but that bottle is supposed to be emptied every oil change.

 

[R-N-R]

I would think filling up, presumably to the first set of holes, every few thousand miles is excessive. Makes me wonder what kind of shape the radiator is in.

 

[FourBarR]

my truck has 385000kms. perhaps a thimble full at 5000mile oil change. sounds excessive in those few miles.

 

[BHiggins]

I agree, but why?

 

[Vaughn MacKenzie]

Maybe the vacuum system has a leak or there is a problem with the vacuum pump, causing too much air circulation through the crankcase. The pump vents into the crankcase and I heard this can cause excessive blowby & oil consumption. No real sure how you'd check it though.



Vaughn