Seal the vacuum pump on OM642, Mercedes Benz, Chrysler and Jeep 3.0L Diesel

[@NS000-00]

You can use the big O-ring that comes with the oil filter (Mann HU821X) in the vacuum pump by removing the front cover with four screws, since that's where it mostly leaks from. That orange seal inside the vaccum pump isn't available from Mercedes, and the aftermarket seal often fails too, which is why they make you spend $800 to replace the whole vacuum pump. Also, while you're at it, replace the metal gasket (MER-6420160280) where the pump connects to the engine, as that can leak over time as well. People have successfully done this on 2012-2015 ML, GL, and R class vehicles with the OM642 engine, but I believe it should work for all OM642 engines, regardless of the model year. Just remember to clean everything really well with brake cleaner and a lint-free cloth before installing the gaskets to avoid any leaks later on. Do this at your own risk since the vacuum is used for the brakes!

[@petermandt]

Thanks.....$800?, here in Seattle theyu quoted me $2,000

[@NS000-00]

$800 just for the part, haha. If you remove the pump from the engine where the metal gasket sits, you’ll likely need to replace the four bolts as well. Bolts used in aluminum, like the engine itself, aren’t meant to be reused. You will have to contact your local dealer for purchase or part number.

[@Konrad-c4b]

so youre saying to use the round black gasket to replace the orange one? I may try this.

[@NS000-00]

@ yes

[@Konrad-c4b]

@@NS000-00 thanks. went out and did this right away. oil filter gasket is a bit larger than the oem gasket for the front of the vacuum pump but shoving it into the groove made it fit. my pump was full of black oil and a bit of sludge. im not sure if thats good or not but i cleaned it out.

[@danieldavidsen4675]

Thank you👌

[@turhalordu4746]

Super, richtig gut gemacht. Danke. Wo kann man diese Ersatz Dichtlinge kaufen? Liebe Grüße und guten Rutsch in das neue Jahr wünsche viel Gesundheit und nur das Beste

[@benzworxx]

* Dichtungssatz Unterdruckpumpe amzn.to/3Z6kc82 steht aber auch in der Videobeschreibung

[@VitjaWolf]

top

[@Nebur-xx5xw]

Buen video! No pierde aceite motor al realizar el cambio? Gracias !

[@benzworxx]

There are maybe 5ml of oil in it, so it's negligible

[@Nebur-xx5xw]

@@benzworxx thanks!

[@coolcat23]

Ich fand es sehr interessant die Vakuumpumpe mal von innen zu sehen. Sollte man die Schrauben nicht mit einem definierten Drehmoment anziehen?

[@benzworxx]

M8ter Schraube in der Regel mit 25NM wenn nichts Anderes angegeben ist

[@n10plus40]

Mine is leaking somewhere at bottom half between engine and pump after replacement with original new pump and gasket. I could not find online any other cause but gasket or internal seal, but that is not the case with mine...

[@NS000-00]

The oil filter housing might be leaking, if thats the case replace the whole oil filter housing ($250) not just the gaskets.

[@TheDelux35]

Super Video! Haben Sie vielleicht ein link von wo man die Dichtung kaufen kann?

[@benzworxx]

www.ebay.de/itm/265996105948?mkcid=16&mkevt=1&mkrid=707-127634-2357-0&ssspo=POPAoacLS4m&sssrc=4429486&ssuid=eIfsgk1GQz2&var=&widget_ver=artemis&media=COPY

[@jackychan4960]

Where can buy the o ring and gasket hve you any link

[@benzworxx]

lmdfdg.com/?q=om642%20w%C3%A4rmetauscher%20dichtsatz

[@NS000-00]

You can use the big O-ring that comes with the oil filter (Mann HU821X) in the vacuum pump by removing the front cover with four screws instead of paying $800 to replace the whole vacuum pump. The aftermarket seal often fails too, so this is a cheaper and better option. I haven't tried it myself, but I know a few people who have, and it worked for them. Also, while you're at it, replace the metal gasket (MER-6420160280) where the pump connects to the engine, as that can leak over time as well. People have successfully done this on 2012-2015 ML, GL, and R class vehicles with the OM642 engine, but I believe it should work for all OM642 engines, regardless of the model year. Just remember to clean everything really well with brake cleaner and a lint-free cloth before installing the gaskets to avoid any leaks later on. Do this at your own risk since the vacuum is used for the brakes!

[@jackychan4960]

Thank you