Cummins Reman Turbo

[DVT873]

(11-16-2019 )Rawze Wrote:  

(11-16-2019 )DVT873 Wrote:  General crankcase pressure question. I read thru this and the linked thread. From reading is it correct that a leaking turbo seal can put pressure in the crankcase? Making the blowby increase? Have a medium duty engine that appears to be doing that. Thanks

not typically, but crank case pressure can cause face seal to leak.

put oil drain line from turbo into bucket to find out.

So if I have pressure coming out of the drain line from the turbo along with oil it is coming from the turbo? If I have pressure from the crankcase, I would need to measure, that could push the seal out? The turbos are Borg Warner factory remains, 6 months old. Pushing oil out and into CAC and beyond. Have sent turbos for tear down and inspection. Found this after cooling package was out for a front cover problem. Didn't want to take engine to temp. Was able to run a software based relative compression test that is usually in the ball park. Compression looks OK. This is a Closed Crankcase system that does have some issues.