Long ago when I blocked the oily air going back to the intake manifold, I replumbed the path to vent out the top front passenger side. I simply used a hose to go back past the bottom of the engine. Not much oil comes out because there are no oil spots on the driveway from drippage.

Sometimes if we are stopped and idling there is a slight odor inside the passenger compartment that probably comes from that hose.

I'm thinking of using the air filter housing as a ' catch can ' to collect any oil drops and have the crankcase air flow back into the engine.

So my 'goofy possibly' thinking is:

Connect that hose to the intake air filter housing, below the air filter. The crankcase air would be sucked back into the engine through the filter so we wouldn't have any odor from that air.

Only two problems I can think of and don't think they are worth worrying about is:

- does that 'crankcase air' affect the combustion and resulting power?

- since there is minimal oil shouldn't something like a ' maxi-pad ' below the air filter work to catch the oil?

I tried to upload two pictures but this post blocks them from being used again, since they were used previously in a different post. I even tried changing their names but they were still blocked. Hard to believe they would do an image compare. The pics would have been helpful.

Or just use a catch can

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92 e300d2.5t
01 e320
05 cdi
85 chev c10

If there is so little oil that there is no drippage on the driveway from that hose then why not just reconnect it back to the intake?

Like it's supposed to be

Click on the image in the original post, and open it in a new tab.
Copy the url, and when editing your post, use the insert image icon to insert the image in your post.

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78 W116 300SD 'Desert Rose' new as of 01/26/2014
79 W116 300SD 'Stormcloud' RIP 04/11/2022

To me, eliminating the numerous rubber and plastic parts that crack and fail is worth keeping it simple. Just as soon not worry about replacing same parts again when they crack and fail.

A few simple changes can make for less future maintenance:
- one way pulley on alternator, and others that are simple and not expensive

I believe this post is probably a pretty complete list of the parts eliminated:

http://www.peachparts.com/shopforum/mercedes-parts-reference-library/191710-1995-e300-diesel-crankcase-breather-pipe-kit.html

I have a catch can but quit using it because hardly any oil was being collected and there was constant odor since the gases were released higher up in the engine compartment.

My main concern is not having the odor of the crankcase air being sucked in by the blower fan during idling and sitting still.

Old post link to one picture:

http://www.peachparts.com/shopforum/attachments/diesel-discussion/146254d1515993480-95-e300d-my-1st-attempt-route-engine-vapors-away-intake-valve-area-mbz-replumb-vent.jpg

The way I've proposed is simple, and the crankcase air is sucked into the intake anyway. Just the liquid oil won't go back. PVC piping and heavier hose has very little chance of failing. So I guess I'll try it sometime.

I did this on my 97 and it worked for a few months. But eventually I the air box became an oily mess along with the air filter and the body work below the air box. No good. A better solution was to drill a hole into the bottom of the crossover pipe, fit a brass elbow and run a short length of hose from the breather at the back of the head to the cross over pipe. Dumping the crankcase ventilation into the intake isnt a problem. It's when you combine the crankcase vent oil with EGR soot that you clog up the intake.
https://imgur.com/a/8n42LP3

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CENSORED due to not family friendly words

tjts1,

Really appreciate the reply. I won't do what I was planning. I like your idea of connecting to the intake crossover pipe for the crankcase air. Just wondering if it handled the liquid oil without pooling in the lower part of the intake manifold.

I haven't had the crossover pipe off to check if it's pooling. All I can tell you is the engine is still running a year later.

One more thing. I cut the plastic cover that goes over the injectors in half so I can remove it easily without having to pull the crossover pipe.
https://imgur.com/a/gCV5nNX

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CENSORED due to not family friendly words

Cutting the plastic cover...there's a modification I can get behind!