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#1
06-20-2025, 04:30 PM
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How to stop my oil leak. 83 300sd
I have a 83 300sd and recently I started to leak oil out of my injection pump. It is a small dribble and not constantly flowing. How can I fix this. Is it a bad seal? If that is the case where can I buy a new one and install it?
here is where the oil is coming from. https://imgur.com/lhaHUwZ 
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#2
06-21-2025, 02:05 PM
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Pull the clip and washer and you should find an o-ring in there. You might be able to order it by application, but it might be easier to try to match it visually.
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#3
06-21-2025, 10:19 PM
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It may be a round cryosection O-ring but usually that is not so.
If that is a moving shaft like the throttle lever shaft the O-ring has a cross section like the first one at this site. I think it is called a quadring. https://www.lindepolymer.com/what-are-the-special-cross-section-o-shaped-rubber-seals/ However, a round crossectiond O-ring may work for a long time. Those are easier to find and could be worth a try. If you go to one of the Russian parts sites they may show the Mercedes part number for the individual O-ring. Bosch fuel injection pump shops will have them and likely a lot of extra ones just in some box, but it takes someone who has worked on them to pick the correct O-ring from a box of extra different sized O-rings.
__________________
84 300D, 82 Volvo 244Gl Diesel
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#4
06-24-2025, 08:08 PM
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Hm ,that's challenging. The EPC does not list the seals (no surprise)...and the Italian seal kit manufacturers do not list Bosch corresp. part #...and either put extra stuff...or omit some (understandable) .
We're looking at position 410 on the schematic :   ...and the seals sure do not look like simple o-rings...I think they must be the simmerrings on this pic judging by their size (Italian SPACO PES6mw seal kit #GK210) , 2 pcs. included in the kit, here next to the pump elements' o-ring seals. They cannot be IP camshaft radial seals ...then what could they be?   ........... ...or, position #6 in FLAG #801271 PES5MW seal kit . https://flaggermany.de/en/produkt/gasket-kit-373/ I could not trace the Bosch or MB or any other part #...or the size ...
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#5
06-25-2025, 01:16 PM
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Quote:
Spaco is an aftermarket maker of this simmerring (17mm OD x 11mm ID X 4mm Thickness)
__________________
78 W116 300SD 'Desert Rose' new as of 01/26/2014 79 W116 300SD 'Stormcloud' RIP 04/11/2022
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