Engine/Transmission (1994 - 1998) Blow by

[jeepullr]

I'm getting a lot of oil dripping out my vent tube, I assume this is blowby.



When I had my injectors out (less than 1000 miles ago) I did a compression test. All cyl's were within 20#'s of each other, and they were all around 500#.



Anythoughts as to why I'm suddenly getting lots of oil out the breather?

 

[pwerwagn]

Vaccuum leak is usually the first thing to check. Thats what it ends up being 90% of the time.

The vaccuum pump discharges into the crankcase, so when there is a leak its like a small pump pressurizing your crankcase.



-Jeff

 

[jeepullr]

Any easy way to check for vacume leaks on a Diesel? I know on a gasser you just spray carb cleaner around... revs go up, you've found leak. Anything like that on these?

 

[moparguy]

may be off on this a bit, but I'm thinking if you hook a vacuume gauge up on any of the small vacuume hoses, you should see 15 or more inches of vacuume. Indicating no leaks.



If I'm wrong, someone please correct

 

[NHays]

Yep that will do it.

 

[wildmanben]

15psi? shoot, I get about 25 out of mine.

 

[NHays]

I think you ment inches of vacuum but yeah it should be abot 20-30, depending on wear.

 

[jeepullr]

Sorry, forgot to get back to this post. Felt around on all the vaccume lines, found a big crack in the line going to (from) the cruise control (another problem fixed). Replaced the line and no more gushing from the breather tube.



Thanks for the info.

 

[JWaters]

my brother needs to read this

 

[Boosted6]

Thanks Jeff, the truck is at the Cummins shop now. . Maybe I will know something tomorrow. .