S350 oil pan - PeachParts Mercedes-Benz Forum

rdanz · #1 05-17-2003, 04:17 PM

How do you remove the oil pan from a 94 S350 .
Please explain in as much detail as you can, thank you

psfred · #2 05-17-2003, 04:38 PM

Let me check in the CD manual later, it can be done with the engine in the car, but is a PITA.

Peter

sixto · #3 05-18-2003, 03:59 AM

Peter, is there already a CD manual for a W140?

Sixto
91 300SE
87 300SDL
83 300SD

rdanz · #4 05-18-2003, 03:28 PM

Quote:

Originally posted by psfred
Let me check in the CD manual later, it can be done with the engine in the car, but is a PITA.

Peter

? I also would like to know if theres a cd for the 140?

psfred · #5 05-18-2003, 07:50 PM

Its in the W124 manual (the "aftermarket" cheap on from Ebay) that also includes some information for the W126.

The 350 went into both bodies, I think, but I don't imagine the removal would be all that different.

Peter

oldsouth · #6 05-19-2003, 12:12 AM

I just had mine done at the dealer because it entailed unbolting the engine mounts and raising the engine a little to get to the front bolts. Good idea to change the engine mounts and probably the transmission mount while you are there. Don't forget the seals for the dipstick.

rdanz · #7 05-19-2003, 05:33 AM

Quote:

Originally posted by oldsouth
I just had mine done at the dealer because it entailed unbolting the engine mounts and raising the engine a little to get to the front bolts. Good idea to change the engine mounts and probably the transmission mount while you are there. Don't forget the seals for the dipstick.

Did they remove the pan or just lower it to change gasket?
Also does you car clatter loudly when its warmed up and at around 600 rpm?
My dealer doesn't work to often on diesels and sez there supposed to clank and clatter. Car was wisper quiet when I first got it now it clanks and clatters.

oldsouth · #8 05-19-2003, 10:40 AM

They removed the pan. I think once you get the front bolts out and drop it down enough to get a gasket on, it is no trouble to take it all the way off. You will probably have to scrape some of the old gasket off anyway and it would be easier removed.
Check the little shock on the drive belt to see if the bushing is worn. This will give a clattering sound at idle. Just hold pressure against it while the car is idleing to see if the noise stops.
I wouldn't worry about the clatter if it is the engine unless it is using a lot of oil (quart every 1000 miles).

psfred · #9 05-19-2003, 07:33 PM

Only the lower part of the pan (actually on the side) has a gasket. The upper pan is machined, uses only a thin bead of RTV sealant.

The front shock will sound exactly like a bad injector or wrist pin, stops instantly when you touch it. Replacement requires removal of the visco clutch, requireing a special tool (or two) -- an 8mm allen key cut off and welded into a flat bar to break the center holddown bolt loose and a peice of heavy wire (about 1/8") to hold the visco clutch while loosening the bolt. Both can be shop made.

Lower oil pan doesn't require moving the engine, I don't think. Have not looked to see on the 300D, though.

Peter

rdanz · #10 05-20-2003, 01:17 AM

Quote:

Originally posted by psfred
Only the lower part of the pan (actually on the side) has a gasket. The upper pan is machined, uses only a thin bead of RTV sealant.

The front shock will sound exactly like a bad injector or wrist pin, stops instantly when you touch it. Replacement requires removal of the visco clutch, requireing a special tool (or two) -- an 8mm allen key cut off and welded into a flat bar to break the center holddown bolt loose and a peice of heavy wire (about 1/8") to hold the visco clutch while loosening the bolt. Both can be shop made.

Lower oil pan doesn't require moving the engine, I don't think. Have not looked to see on the 300D, though.

Peter

Peter what is the vicus clutch and where is it located?
Called dealer said there are only two ways to remove pan 1= remove engine
2- remove subframe assembly . I think they said that to scare me.

sixto · #11 05-20-2003, 02:06 AM

Cutting in on Peter here - the viscous clutch is the the thermostatic clutch at the core of the plastic fan between the engine and the radiator. Because the fan is not engaged at engine temperatures cool enough to work on the engine, you have to mechanically restrain the pulley so you can loosen the bolt holding the fan and clutch to the pulley. If there were a rigid fan drive, you could just hold the fan itself.

As for the pan, here's another perspective. The Performance Products catalog shows that the side pan and gasket they offer are for the 603.96x models only, not the 3.5l 603.97x models. Maybe there's a different oil pan design or maybe the 140 has a beefier crossmember that doesn't take kindly to working around it.

Sixto
91 300SE
87 300SDL
83 300SD

oldsouth · #12 05-20-2003, 09:08 AM

There is only one oil pan on my '95 350 and you can not get it off unless the engine is unbolted and raised. PITA

And I changed my drive belt shock without taking off the fan clutch.

psfred · #13 05-20-2003, 06:58 PM

Old South:

I need to change the belts on both cars also, much easier with the fan off.

I think the pan can be removed in the W124 and possibly the W126 without pulling the engine, but I don't know about the W140. Certainly you cannot remove the subframe as it does not have one.

Peter

rdanz · #14 05-20-2003, 07:12 PM

Quote:

Originally posted by psfred
Old South:

I need to change the belts on both cars also, much easier with the fan off.

I think the pan can be removed in the W124 and possibly the W126 without pulling the engine, but I don't know about the W140. Certainly you cannot remove the subframe as it does not have one.

Peter

The 140 has a sub frame.