Air flow doesn't seem to bother the very same check valve when it's installed in a vacuum pump.

My 300TD literally driped oil from the air filter housing. I thought it was all the above. When I finally removed the oil pan to look, I found that someone in the past removed the oil seperator check valve and the retaining ring.
The oil seperator check valve allows oil to drain into the oil pan from the oil seperator. It does not allow oil to go from the pan up to the airfilter. Since it is a one way valve blowing air or pour oil through it from the top to the oil pan should not harm it.
If you want to check if the oil seperator check valve is there, you can snake a piece of wire through the drain tube and measure the how far the wire went in before stopping. If it is approxmatly the same as the drain tube, it is there. If it goes longer and I mean considerably longer because the wire will be in the oil pan, it is not there and you need to find another one.
The oil seperator check valve (I should have abreviated this OSCV, oh well) can be in the car, oil can still flow through it and it still be broken if the seal doesn't fit or is torn.

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81' 300TD
Peter

thanks! Helpful information!

X2 !! I never knew or really cared what the check valve was there for.

Now I'm thinking soda straw without it .
Thanks Schmidt.

There was a thread about sealing the seam around the oil separator under the valve cover ( long flat square box ). The largest opening will be in the front where the blow by tube is located. The main opening is at the rear. The front opening gives the oil a short cut. I think layback posted on that.

Mine was about 1/8" open. I Sealed it with fast setting JB Weld.

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Experience : what you receive 3 seconds after you really needed it !!



86 300SDL 387,000? Motor committed suicide
81 300SD 214,000 "new" 132,000 motor
83 300SD 212,000 parts car
83 300SD 147,000

91 F700 5.9 cummins 5spd eaton 298,000
66 AMC rambler American 2dr auto 108,000
95 Chevy 3/4 ton auto 160,000
03 Toyota 4runner 180,000 wifes

Okay I believe I have found the right fourm to help me out. I have a 85 300sd. And I have some blowby as we all do but on the passanger side of the air breather box it is leakint oil out the bottom when running. There are small holes in my breather box just big enough to put the tip of a pen in them. Now im pretty sure the oil if coming from the blow by tube and then goes into breather box and has now where to go so it leaks out the hole all over everythint bellow it. My question does this engine have the drain tube that I read about that leads to the oil pan? That is if I understand everything right? Possibly that drain tube is clogged and now it has now where to go except for the small hole in breather box? Please someone help. I don't know where to start looking for this drain tube that runs from box to oil pan any one have pics or anything that can help. All help is thankful in advance. Good day.

About in the center of the Breather Drain Tube it attaches between a Bracket and the Engine Block; attached to the Bracket.

On mine that Bolt and Nut were lose and others have had the welded on Tab break off. Either can leave that Tube unsupported and loose.

And, then there is Engine Vibration that can loosen it.

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84 300D, 82 Volvo 244Gl Diesel

If you can locate your Turbo Charger Drain Tube one the bottom end of the Breather Drain Tube is between the bottom of the Turbo Drain Tube and the Engine Block.
See post #10 in the below thread. The Pic on the Left shows an Engine that has a Turbo Drain but there is no Breather Drain.
The Engine in the pci on the right has the Turbo Drain and the Breather Drain Tube and item #6 is the bottom end of the Breather Draing Tube.
Garret Turbo Rebuild on 617..need help

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84 300D, 82 Volvo 244Gl Diesel

I believe I have it fixed now. I bent the tabs back and set the oil separator down where it goes. Now I have another question. Im not sure how to make a new post or a new forum so I was gonna up load a pic and ask why Im seeing oil where I am seeing it I think that this is my blow of for the turbo right or wrong??? Can the blow off leak oil? Im asking what the thing is that I circled in red and ive been getting oil on the manifold gasket where i painted the yellow at on the pic. What can I do to fix. Is there a gasket some place? Is it dripping from blow off for turbo?
http://s23.postimg.org/nawesb363/DSCN0121.jpg
Thanks!

The device circled in red is the EGR valve. Do the engine a favor and plug the line with a steel ball. Leakage by the yellow line is the intake manifold connection to the head. I would check the torque on the manifold bolts. If it's just sweating, I wouldn't worry about it.

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'83 300D, 126K miles.

OK so plug the egr vacuum line? Just wondering but what is the benefit of that? Also the gasket is brand new so I do agree they may need to be re toqured what do those bolts torque to?

Manifold gasket, or valve cover gasket? Adjust the valves, replace that gasket, torque properly, tight snug.

You can remove a few vac lines from the egr, or simply not allow vacuum to get to that thermo valve.
MB egr fun - YouTube

Click on the "Post New Topic" button to start a new thread.

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83 SD

84 CD