Hi,

I have a 1988 W124 300D non turbo fitted with the OM603 engine.

In the morning when starting from cold, it will take roughly 10seconds for my oil pressure guage to show any pressure....when it does it goes straight to 3 and is fine thereafter.

I have read that the O rings on the stem/pipe that goes through the middle of the oil filter can wear, which in turn allows the oil to drain from the filter.

I also understand that you can replace these O Rings, however, when I went into my local Benz dealer, they said the only thing I could do is replace the whole stem/pipe as they do not list the O Rings individually.

Is this right?......or does anybody know the size of O Ring that I need to get....any other ideas or thoughts?

Many thanks

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Current Mercs
R129 1994 300-24SL
W124 320E Turbo Technics Twin Turbo 350bhp

Previous Mercs
W124 1986 Quad Cam AMG Hammer, 45,000 miles
W124 300E Turbo Technics Twin Turbo 320bhp
W124 E500

They are available seperately

part number A 015 997 94 48

Don't expect them to stock them, most techs don't change them cause they don't come with the filter. The dealer I work at only stocks them cause I buy them every 6000mi

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Alex.

MB Tech
Sydney, Australia
Volvo 122S
W201 190D 2.5 manual
W202 C240
W203 C32

also, if you look carefully there are 2 pin holes in the stem itself that can get blocked with crud. 1 is near the top and the other near the 2nd o-ring

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1984 300D Turbo - 231k....totalled 11/30/07 RIP

Nonsense. The o-rings are 6 x 10 x 2 mm. You are lucky that your fan belts were not worn out. They probably would have to replace your entire engine for a serious problem like that!!!

There were new orings with my Wix filter from NAPA. Filter is made in Poland.
Cleaning out the little holes in the stem is a good idea. I did it with compressed air last oil change and my pressure rises more quickly now. Of course, I also put in the new orings.

DS
87 300D

The "O" Rings are definitely available separately. My local Dealer gave me half a dozen for free and suggested I replace them every 3-4 oil changes. Top & bottom are the same by the way.

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1991 M-B 560SEL Arctic White/Grey 99,000 Miles
1987 M-B 300SDL Ivory/Palomino 229,000 Miles (sold but never forgotten)
2006 Volvo XC70 Blue/Beige
1999 Porsche Boxster Arena Red/Savanna Beige
1986 Porsche 928S Goldweiss/Brown

I mesured the grooves where the O-rings go on and found that the stem grooves are not same size. The proper O-ring for the larger groove it is 11x7x2mm and for the smaller groove it is 10x6x2mm. I bought the O-rings in a hardware store.

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Roman
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87 300SDL 152K
86 420SEL 228K
83 280SL 145K (5 spd)
_____________

Location alert!
Vladimir is in Reading, England. So the parts on his car may be different from ours.

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Rick Miley
2014 Tesla Model S
2018 Tesla Model 3
2017 Nissan LEAF
Former MB: 99 E300, 86 190E 2.3, 87 300E, 80 240D, 82 204D Euro
Chain Elongation References

The O-rings are available in the Performance Products catalog.
www.************************ I replace mine every other oil change, though they have never looked worn.

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'78 300D 310K Maple Yellow / Bamboo
'87 300D 81K Barolo Red / Safron (RIP @ 113K)
2003 E320 34K Pewter/Charcoal
-------------------------------------

when i replaced the o-rings (from the originals ) i noticed that the top one was a little larger. however 2 same size new o-rings fit ok in both places...
i noticed a marked improvement of startup oil pressure and by cleaning the pin holes in the shaft the hot idle oil pressure reading is much higher than it was.

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1984 300D Turbo - 231k....totalled 11/30/07 RIP

.56 cents each

http://www.***********************/catalog-exec/

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Audi TT

Not according to Mercedes.

Thanks guys for your responses.....time to go and give my Benz dealer a kick!

__________________
Current Mercs
R129 1994 300-24SL
W124 320E Turbo Technics Twin Turbo 350bhp

Previous Mercs
W124 1986 Quad Cam AMG Hammer, 45,000 miles
W124 300E Turbo Technics Twin Turbo 320bhp
W124 E500

These "O" rings can look like they are good but they can get as hard as rock and be very brittle. The heat from the oil does a number on them.

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N. Hodges
1994 S350
1987 300 SDL (for sale)

Now that you have mentioned it.... I was trying to take the gaskets off the other day and they broke off as if they were made out of plastic. Once I cracked the first one off I said to myself "Oh ****, I have the wrong o-rings since these are plastic" Then I realized that they were probably fried.

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Audi TT