Clouds of grey smoke, need help - Page 2 - PeachParts Mercedes-Benz Forum

BathCity · #16 05-24-2008, 05:02 PM

The saga continues...I replaced the motor mounts today, started at 9:00 AM and finishe at 3:30PM, what a job, but heir in.
I took her for an "Italian tune up" out on I-94, she seemed to run great, still alot of smoke. She ran good at 70 mph and had lots more pedal. Some passing cars looked a biy perturbed by the smoke.
SO I get home and the INSIDE of the hood is covered in oil from mid passenger seat to the drivers side. Looks like it was blowing out of the oil cap. Yes it was on correctly. Can anyone give me some insight? Some idea of the things that could be causing the oil all over the inside of the hood & Engine. None of my other diesels have ever done that. Looks like I'll go get a compression set at Harbor Freight and see whats up.

Jeremy5848 · #17 05-24-2008, 07:42 PM

You shouldn't be getting oil (vapor or otherwise) out of the oil cap unless the breather in the valve cover is clogged up or the tubing from the valve cover to the air cleaner (or wherever yours goes) is not working.

It is possible to accidentally interchange a fuel cap and an oil cap. They look the same but I'm told won't seal correctly if the wrong one is used. The original metal oil cap usually says "OEL" while the fuel cap is unmarked. Not sure about the later plastic caps.

Jeremy

bgkast · #18 05-24-2008, 08:21 PM

The seal in the cap can go bad, try a new one. If the seal leaks or is missing it will coat the engine, even on an engine with low blow-by.

BathCity · #19 05-25-2008, 08:43 PM

Here's what I've done today.
- I found a vacuum line disconnected & reconnected it. I replaced the seal on the oil fill cap, it's way tighter now.
- I went to remove the valve cover and found that the gasket was split on the "wavy" side. I removed the valve cover, checked the breather tube, it had a small bit of gunk but not much. I cleaned out the breather tube, cleaned the valve cover & used gasket, put a previously used gasket on with some high temp RTV flange sealant in the groove and on the face.
- I removed and cleaned the little oil tube that goes across the intake manifold where it bolts to the head. The breather tube dumps into this.
- I buttoned it all up and took her to the quarter car wash and washed the engine, engine bay, trans, & underside of the car to remove the oil from the fiasco yesterday.
- I ran her at 60 for a couple miles, went home and found no oil leaks this time. New oil fill seal seems to be doing the job
- I bought a diesel compression tester & ran the compression test.
cyl 1=320psi, cyl 2=325psi, cyl 3=325psi, cyl 4=350psi.
She still is smoking badly but not as bad as yesterday. I don't know what to do next, anyone have some advice?

cg487 · #20 05-25-2008, 09:18 PM

Quote:

Originally Posted by BathCity

Here's what I've done today.
- I found a vacuum line disconnected & reconnected it. I replaced the seal on the oil fill cap, it's way tighter now.
- I went to remove the valve cover and found that the gasket was split on the "wavy" side. I removed the valve cover, checked the breather tube, it had a small bit of gunk but not much. I cleaned out the breather tube, cleaned the valve cover & used gasket, put a previously used gasket on with some high temp RTV flange sealant in the groove and on the face.
- I removed and cleaned the little oil tube that goes across the intake manifold where it bolts to the head. The breather tube dumps into this.
- I buttoned it all up and took her to the quarter car wash and washed the engine, engine bay, trans, & underside of the car to remove the oil from the fiasco yesterday.
- I ran her at 60 for a couple miles, went home and found no oil leaks this time. New oil fill seal seems to be doing the job
- I bought a diesel compression tester & ran the compression test.
cyl 1=320psi, cyl 2=325psi, cyl 3=325psi, cyl 4=350psi.
She still is smoking badly but not as bad as yesterday. I don't know what to do next, anyone have some advice?

Look inside the intake. How much oil is in there? The only thing I can think of now is oil vapour collecting in the intake and being drawn in with the fresh air.

BathCity · #21 05-25-2008, 10:10 PM

I looked inside the intake and I have oil comming out, not a huge amoint, but it is there.