oil diagram - PeachParts Mercedes-Benz Forum

tubular031 · #1 11-04-2009, 12:06 PM

I am still chasing down oil leaks on squirt (my new name, she squirts oil all over!)

The bigger one looks to be coming off the back of the motor somewhere. How/what connects the oil canester to the rest of the motor? how about the oil cooler lines? where do those attach to the motor and how are they sealed (orings?)

The valve cover no longer leaks and I also (for now) fixed the leak on the turbo return.

Les Jenkins · #2 11-04-2009, 01:20 PM

The filter housing uses 5 bolts and a gasket. Those with leaks often fix them simply by tightening the bolts using a 5mm allen key.

Biodiesel300TD · #3 11-04-2009, 01:24 PM

The oil filter housing bolts right to the block, and has a paper gasket that can be replaced. The oil cooler lines are attached to the oil cooler next to radiator and go to the oil filter housing. Typically the oil cooler lines start leaking at the crimp that holds the metal ends onto the hose.

tubular031 · #4 11-04-2009, 03:27 PM

both oil cooler hoses attach to the filter housing? I know my hoses are starting to leak up by the cooler but its a tiny leak.

Ill see if I can snug up the bolts on the housing that hold it to the block.

Biodiesel300TD · #5 11-04-2009, 04:02 PM

Quote:

Originally Posted by tubular031

both oil cooler hoses attach to the filter housing?

Yup.

tubular031 · #6 11-04-2009, 04:49 PM

How do those lines seal to the housing? O rings, paper gasket, JIC (I wish!), NPT?

compress ignite · #7 11-04-2009, 05:57 PM

Same as at the Oil Cooler.

Yak · #8 11-04-2009, 07:35 PM

Oil leaking on the driver's side back and flowing down onto the tranny is probably the oil filter housing gasket. There are five allen bolts and one is a PITA since there's no clearance to get a regular one in there. Do a search and you'll find advice. ************** claims to sell a special kit with cut-down tools to make it easier. The danger with trying to crank down on the bolts to seal the leak is that now you've just torqued the hard-to-reach bolts you'll need to remove in order to replace the gasket if that repair doesn't stop it. It's a risk vs. reward judgment on your part.

I found getting all the lines back into position a hassle, since you're dealing with the turbo line, both oil cooler lines, the oil pressure line.

The oil cooler hoses are bit pricey, but they break down and start to weep oil over time. That oil flows back onto the engine mount and other components on the driver's side and makes it hard to ID other leaks. The fittings on the cooler seem to be a troublespot in the repair due to corrosion issues between the cooler and the hoses. 27 mm wrench, I think.

The best starting point is probably a can of engine cleaner and high-pressure car wash. Get it as clean as possible, ID the leak, clean it before the repair.

Scruffyguy1981 · #9 11-04-2009, 09:39 PM

sure to keep a close eye on your oil levels. My current project had a rod knock on number five due to lack of maintenance on the oil cooler hoses. On the up side I purchased the car for $400.00 because of this. I say had...it finally broke the piston in half, destroyed the rod jornal and connecting rod and poked out under the oil filter. Only 171k on the motor....died too young because of the hoses. I'm taking the hoses to a local shop to have new lengths of hose crimped onto the tubes since this will be cheaper than the mercedes ones. Anyplace that carries hoses and such (dunno if EVCO is national or not) should be able to do it.

Les Jenkins · #10 11-04-2009, 10:02 PM

Quote:

Originally Posted by tubular031

How do those lines seal to the housing?

It is a flare fitting. No gaskets, rings or sealant.

tubular031 · #11 11-05-2009, 10:00 AM

Quote:

Originally Posted by Yak

Oil leaking on the driver's side back and flowing down onto the tranny is probably the oil filter housing gasket. There are five allen bolts and one is a PITA since there's no clearance to get a regular one in there.

That is exactly what I am experiencing. Its going to be a few days will I can get to the car again. Ill take a crack at this and see what I come up with.

charmalu · #12 11-05-2009, 12:41 PM

The hose has a tiny leak by the oil cooler? HMMM, that could become a gusher. the hoses are probably the original and 20 yr old rubber will be like a rock. any seeping around the crimps is a warning.

If the SDL is like the 300D 617, then use a 7/8 on the oil cooler as a back up and make a Flair nut wrench out of a 1 1/6 box wrench for the oil line.

Charlie

tubular031 · #13 11-05-2009, 03:19 PM

Guess the next thing to do is replace the oilcooler lines