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  #1  
Old 03-11-2015, 02:15 PM
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Location: Twin Falls, Idaho
Posts: 330
Oil in Air Cleaner Box

I opened the air cleaner box on the 84 300Sd to track down oil all over the top of the strut mount, the box is directly over the mount. There is a drain hole in the box, its seems that is where the obvious oil is coming from.

There is quite a bit more oil than usual in the box. What might be the usual suspects for that?
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1st MBz: 1982 300SD
2nd MBz: 1987 300SDL
3rd MBz: 1995 S420
4th MBz: 1987 190DT
5th MBz: 1984 300SD w/1983 300DT engine
6th MBz: 1999 C230k I'm 3rd owner, got it w/57,235 miles.
and manages Mom's 2007 R320 CDI
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  #2  
Old 03-11-2015, 03:01 PM
WTB: 94/95 E320 Wagon
 
Join Date: Oct 2007
Location: Charleston SC
Posts: 2,456
Excessive oil from the breather tube (between valve cover and air filter box)?

This was passed from the late Dr. Marshall Booth on an email list I subscribe to:

---------------------------------------------------------------------------------
> The late Randy Durrance documented the "official" MB fix some
> years ago.
>
> > This is usually done when the valves get adjusted. Pull
> the valve cover off and look at the front edge of the oil baffle plate where it meets the inside of the valve cover close to the oil cap and breather. If it has been fixed, you'll see a gray epoxy covered area. If it needs fixing, you'll see about an eighth inch gap. Clean the area with brake-clean and apply epoxy.

Don't use RTV. Don't use J-B Weld (it takes too long to dry and will ooze through the gap. The official stuff was Lock-tite/NAPA 5-minute epoxy. It does an excellent job and is oil resistant. We used to do this at the M-B dealer in the 1980s. It paid an additional 2 tenths of an hour to do the job with a valve adjustment.

Regards,
Randy D.

Make sure that you have the revised flat one piece hose that connects the valve cover vent to the air cleaner and not the 3 piece original one. It's inexpensive - maybe $12 last time I checked.
---------------------------------------------------------------------------------
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Respectfully,
/s/
M. Dillon
'87 124.193 (300TD) "White Whale", ~380k miles, 3.5l IP fitted
'95 124.131 (E300) "Sapphire", 379k miles
'73 Balboa 20 "Sanctification"
Charleston SC
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  #3  
Old 03-11-2015, 03:30 PM
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Location: Twin Falls, Idaho
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Thanks Max. I was planning on adjusting the valves soon. It does seem to be coming from the breather tube.
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1st MBz: 1982 300SD
2nd MBz: 1987 300SDL
3rd MBz: 1995 S420
4th MBz: 1987 190DT
5th MBz: 1984 300SD w/1983 300DT engine
6th MBz: 1999 C230k I'm 3rd owner, got it w/57,235 miles.
and manages Mom's 2007 R320 CDI
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  #4  
Old 03-11-2015, 04:48 PM
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Location: Ontario, Canada
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Quote:
Originally Posted by Gregory View Post
I opened the air cleaner box on the 84 300Sd to track down oil all over the top of the strut mount, the box is directly over the mount. There is a drain hole in the box, its seems that is where the obvious oil is coming from.

There is quite a bit more oil than usual in the box. What might be the usual suspects for that?
The oil no doubt comes from the breather.

But on the 84 SD, doesn't the air cleaner have a cylindrical separator in the center that separates the oil and allows it to return to the engine? There should be a pipe coming off the bottom that connects to the block/sump.

If you are getting oil on the inlet side of the filter, then maybe the separator is not draining?

On my 85 300D, we switched to an earlier (82?) engine that did not have the sump connection. As a result, that cylindrical separator fills with oil. Some of it no doubt goes back to the engine with the air. But when I do an oil change, I can always suck out a cup or so of oil from the separator (outlet at bottom is plugged)
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85 300D14 GLK250,72 350SL, 98 E320
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  #5  
Old 03-12-2015, 01:19 PM
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Join Date: May 2005
Location: Twin Falls, Idaho
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I looked at my spare valve cover and took some photos. Is this the gap that needs to be filled with epoxy?

__________________
.
1st MBz: 1982 300SD
2nd MBz: 1987 300SDL
3rd MBz: 1995 S420
4th MBz: 1987 190DT
5th MBz: 1984 300SD w/1983 300DT engine
6th MBz: 1999 C230k I'm 3rd owner, got it w/57,235 miles.
and manages Mom's 2007 R320 CDI
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  #6  
Old 03-12-2015, 01:33 PM
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Location: Mount Holly, NC
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if oil is getting into the filter area, the lid of the seperator in the air cleaner needs to be sealed as well.

also, if oil is leaking on the mount below the air cleaner, the o-ring on the nipple to the drain tube ls failed, and needs to be replaced...

I'm not sure about the gap.
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  #7  
Old 03-12-2015, 02:55 PM
WTB: 94/95 E320 Wagon
 
Join Date: Oct 2007
Location: Charleston SC
Posts: 2,456
Quote:
Originally Posted by Gregory View Post
I looked at my spare valve cover and took some photos. Is this the gap that needs to be filled with epoxy?
Yes.
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Respectfully,
/s/
M. Dillon
'87 124.193 (300TD) "White Whale", ~380k miles, 3.5l IP fitted
'95 124.131 (E300) "Sapphire", 379k miles
'73 Balboa 20 "Sanctification"
Charleston SC
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