New member and question re M104 breather valves - Mercedes-Benz Forum

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post #1 of 2 (permalink) Old 02-07-2011, 06:33 PM Thread Starter
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Date registered: Feb 2011
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New member and question re M104 breather valves

Hello BenzWorld forum-ers,

here is a new forum member from San Francisco Bay Area. Currently on my 2nd Benz which is a 1994 E320 convertible. I have been following these forums since 12 months ago when I started working on my 1st MB, which was an 1995 E300 Diesel. I do all of the work on my cars.

First MB (commuter) got rear ended few weeks back and I'm still sorting this out with the at-fault party's insurance company. Finding a replacement 94-95 diesel is not easy in CA and while looking I landed a great deal on this convertible.

Convertible is in a state of "some deferred maintenance but basically healthy", with less than perfect paint. Like most (all?) E320s this has the M104 motor.

As I started doing the basic tuneup (plugs, wires, belt, filters) on this car I peeked under the ignition coil cover and inside the intake manifold. I found lot of oil - sparks plug cavities have perhaps half an inch of oil. There is also oil in the intake manifold runner and this is coming from the two breather valves on top of the engine.

Couple of questions to more experienced forum members:

- isn't the valve cover supposed to have some type of baffle plate inside to stop most of the liquid oil from hitting the openings and PCV valves ? Looking at the two vent holes I can see what appears to be valve train components. Is this normal or has something been removed by earlier owners / mechanics?

- What looks like two PCV valves seem to be made of plastic and permanently pressed to the plastic intake runner tube. Is there any way to replace these ? Or how would you recondition them without removing from the runner?

I already did the EGR pipe roto-rootering and now I'm expecting to find some heavy soot/oil caking from the upper intake and valves.

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post #2 of 2 (permalink) Old 02-08-2011, 08:22 AM
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Date registered: Nov 2009
Vehicle: 1984 190D 2.2
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Try posting this in the w210 forum, you will probably get better results.
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