Lower oil pan leak '99 E430 - Mercedes-Benz Forum
 
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#1 (permalink) Old 07-25-2011, 10:48 AM
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Lower oil pan leak '99 E430

Hello,

I have a 1999 E430 sport model. My lower oil pan seems to be leaking significantly enough to address it. From what I read here, and from the dealer, it uses a sealer and not a gasket. The dealer wants $32 for a large tube of the stuff that's way more that I need. In an earlier search on the subject, I came across a post about a permatex product that can be used for this application. I'm sure I can buy a much smaller amount than the dealer wants to sell me. I'm having difficulty finding that post. does anyone know what permatex product(s) will work for this application?

Thanks
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#2 (permalink) Old 07-25-2011, 11:20 AM
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Autopartsway.com (a newer supporting vendor on this site) sells a syringe-full of the stuff, I'm not sure how many gaskets it would do, perhaps at least the lower oil pan and the pair of breather covers? It's hard to tell from the description.

This is direct link to it. Still not cheap ($18), but it is the real deal.

2001 Mercedes-Benz E320 Sealant - Buy 2001 Mercedes-Benz E320 Sealant Online

Kobus had leaks at his breather covers when he used a permatex product. I used the permatex gray stuff when I resealed one of my breather covers, it's only been about ten thousand miles and though there is no leak, I think that's too soon to tell. This is the stuff I used:
http://www.permatex.com/products/Aut...sket_Maker.htm It was about $8 IIRC for a small tube.

Were I you, I honestly would spring for the tube at autopartsway. A leaky breather cover is just a seep, but if it doesn't seal the lower oil pan, that's a mess.

That said, before you dig in, pull the belly pan (or at least the smaller cover) and spray off all the goo, then check for the source. It's pretty rare for the pan itself to leak (assuming someone hasn't had it apart) but much more common for the level sensor to leak. You have to R&R the lower pan to replace the sensor, so if that's where the leak actually is you'd be able to kill two birds with one stone.

Good luck.

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#3 (permalink) Old 07-25-2011, 11:42 AM
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Thanks for the info. I'll say that I haven't inspected it in great detail, but the entire circumference of the pan seems to be wet. I have removed both the front and rear plastic belly pans in preparation for this and some other work. Where are the level sensors located (front, rear, driver, passenger)? if it is a leak at the sensor(s) how are they repaired (gasket, sealer, new sensor)? I don't even have my torx socket set yet, I ordered one online. I haven't had occasion to use them and I've owned the car since late '03. I'll continue to search the site, as it has a lot of great info. Thanks again for the insight.
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#4 (permalink) Old 07-25-2011, 03:03 PM
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Originally Posted by drfeno View Post
Thanks for the info. I'll say that I haven't inspected it in great detail, but the entire circumference of the pan seems to be wet. I have removed both the front and rear plastic belly pans in preparation for this and some other work. Where are the level sensors located (front, rear, driver, passenger)? if it is a leak at the sensor(s) how are they repaired (gasket, sealer, new sensor)? I don't even have my torx socket set yet, I ordered one online. I haven't had occasion to use them and I've owned the car since late '03. I'll continue to search the site, as it has a lot of great info. Thanks again for the insight.
It's entirely possible the sensor (passenger side, you'll see the connector going to it) was earlier replaced and they didn't use proper sealant or, just as likely, didn't do proper prep so the sealant didn't seal.

If it is all the way around at the gasket point, then you're right, there's probably not much point in investigating further for the source. There is a common leak point at the front of the engine, but that wouldn't explain a leak line horizontal to the engine and at the gasket point, particularly at the rear of the pan.

I would still suggest cleaning it up as best you can before you start disassembly, but after draining it. that way you'll have a clean surface on the upper pan so you can tape some plastic over the opening and prevent dust, hair, etc. from floating up in there while you're cleaning up the lower pan. Have some clean, lint-free rags to stuff up around the inside edges of the upper pan while you're cleaning the old sealant off, too.

Good luck. Hopefully you have someplace relatively cool you can work on it.

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#5 (permalink) Old 07-26-2011, 05:02 AM
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Thanks again for the info. I'll probably buy the $18 sealant, as I think 50ml is more than enough for my application. I'll check the sensor as well.
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