I just finished replacing the turbo and doing a valve adjustment on my 300SD, and after the first time I drove it I saw that so much oil had sprayed out of the oil filler cap that its dripping down the side of the engine onto the ground. Before working on it it didn't have near that much blowby. Could having a functioning turbo and properly adjusted valves have caused this?

My only thought is that you may have adjusted the valves wrong somehow... it's .1 mm for the intake, .35 for the exhaust. Did you adjust them so that the feelers were dragging through the cam and lobe? If you made them much looser, that might explain the blow-by.

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1982 300SD -- 211k, Texas car, tranny issues ____ 1979 240D 4-speed 234k -- turbo and tuned IP, third world taxi hot rod

2 Samuel 12:13: "David said to Nathan, “I have sinned against the Lord.” And Nathan said to David, “The Lord also has put away your sin; you shall not die."

I doubt that the oil sprayed out of the oil filler cap, unless you had been driving around with the cap off. OTOH, a newly installed turbo and valve adjustment creates several possibilities for an oil leak.

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'79 240D

As far as I could tell I did adjust the valves properly, I did use those clearances and get it to be as close as I could. The oil for sure came from the oil filler cap, not enough to get much on the underside of the hood, but there is a puddle on top of the valve cover and oil dripping down the side of the engine.

No oil leaks out of the cap under normal circumstances, no matter how much blow by the engine has. Did you lose your oil cap gasket somehow? A good fitting oil cap seals tightly. Is your crankcase vent pipe loose or obstructed? I've had mine pop loose after doing some messing around under the hood. I'd clean it up, run it, and observe. That's all I've got.

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'79 240D

I have seen many cars in the junkyard that look like they have tons of oil leaking out the filler cap. I just checked and the gasket is still there, I could always try getting a new cap though.

A new gasket won't cost more than a couple of bucks, but even a worn one should give a pretty good seal. If the cap isn't cracked, then it's as good as a new one. I wouldn't do anything until I actually saw the oil leaking out of something. A leaking oil cooler hose can also spray loads of oil all over the engine compartment. That's a good thing to keep an eye on in any case.

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'79 240D

Don`t buy a Oil Cap, justy replace the seal. The old seals get as hard as a piece of plastic and leak. A new seal will do wonders.

http://www.pelicanparts.com/cgi-bin/ksearch/pel_search.cgi?SUPERCAT_FLAG=Y&make=MBZ&please_wait=N&forumid=&threadid=&command=DWsearch&description=oil+cap+seal


Breather hose on top of the VC can also leak when they also get old and hard.

http://www.pelicanparts.com/cgi-bin/ksearch/pel_search.cgi?SUPERCAT_FLAG=Y&make=MBZ&please_wait=N&forumid=&threadid=&command=DWsearch&description=breather+hose+elbow&I1.x=4&I1.y=5


As mentioned, a missing cap seal will cause a oil loss and mess, but they don`t just fall out. maybe a piece broke out and is missing, that will cause a mess.
A loose cap can also create a mess, but a missing cap, and you will really have an oily drippy mess.

I don`t see how a Turbo swap or Valve Adjustment will cause more blow by.

Check and see if the VC is sitting on the black Vac line that goes to the Transmission. this can cause a oil leak, but won`t cause oil on top of the VC.

Charlie

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80 240D Naturally Exasperated, 4-Spd 388k DD 150mph spedo 3:58 Diff

We are advised to NOT judge ALL Muslims by the actions of a few lunatics, but we are encouraged to judge ALL gun owners by the actions of a few lunatics. Funny how that works

The seal is still there, but its probably the original one. I will try changing it. I am 100% sure the oil is coming from the filler cap and that it didn't have that problem before working on it, but other than that I am not sure what might have been the cause.

If the oil fill cap gasket is good?

Without knowing how many miles are on this engine?

My best guess would be failing valve guides.

.

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Just a thought. If the old turbo was not working at all. The increased cylinder pressure may have enabled more blow by since it was replaced.

This in combination with an existing marginal oil cap seal may be giving you these issues. If you are on alternative fuels mention it.

I don't know how many miles are on it either, I have had it about 2.5 years and the odometer was stopped at 376k when I got it. I tried a different oil cap that I had and it doesn't seem to be leaking as much from the cap anymore, so I will try actually buying a new gasket and see if that helps. As far as I know it hasn't ever had anything but normal diesel fuel put in it.

The crankcase vent is surely blocked. I had an old Mercury with so much blowby that it pushed oil up out of the dipstick tube and nothing came out of the cap.

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Whoever said there's nothing more expensive than a cheap Mercedes never had a cheap Jaguar.

83 300D Turbo with manual conversion, early W126 vented front rotors and H4 headlights 400,xxx miles
08 Suzuki GSX-R600 M4 Slip-on 22,xxx miles
88 Jaguar XJS V12 94,xxx miles. Work in progress.

More details. Is the replaced turbo used, New, you replaced the seals in the old Turbo or???

You should recheck the Valve Adustments. It is easy to get destracted and mix up an intake Valve for an Exhaust valve and adjust it wrong.

Essentially if you don't re-check the Valve ajustment you may be "chaseing your Tail" doing other stuff.

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84 300D, 82 Volvo 244Gl Diesel

The above could be true but when I put My thumb over the vent at the top of the Valve cover it took about 7 seconds and the Engine started to stumble and shut down (at idle speed).

The crankcase pressure pushes the Vacuum Shutoff on the IP into the shutoff direction.

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84 300D, 82 Volvo 244Gl Diesel