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What are these and how can I change them?
Hi All,
It's been a long time for me, but I'm still driving the trusty 1986 300e W124. It's been a good car and I plan to keep it for a bit longer... But it's making an annoying squeaking sound and I can only think it's coming from these dead bushings. Attached are 2 pictures. This is a cross member at the back of the car. The greasy gross thing there is the rear differential. It's mounted to this cross member with these 2 bushings that are clearly shot and need to be replaced. By gently lifting on the differential, I can hear a squeak and see this moving. I trust it shouldn't move (or if so, not by much and it should be much firmer than it is) So my first question is: Are these the Wheel Carrier Bushings? If not, what are they? My second question is: Is this something that I can carefully change myself? It looks as though I simply need to remove the allen bolt there, work out that dead bushing, somehow hammer or press in a new one and put the bolt back in. I'm sure it can't be that easy... is it? Thanks All!
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Kyle De Priest 2007 e320 Bluetec 2013 GLK 250 Bluetec |
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They're not wheel carrier bushings. I would descibe them as final drive mounts/bushings.
Changing them will likely entail dropping the final drive so they can be pressed/driven/hammered out. You should contemplate renewing whatever seals are leaking as the oil will degrade your new mounts. |
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Sounds redundundant to me. There isn't a front differential mount.
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I bet I could get a gear puller in there and work them out that way... I just need to find replacements. Could probably order them from my guy.
The grease is from a bad transmission that I've already had replaced, so I'll do a good clean up job on this differential when I'm there.
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Kyle De Priest 2007 e320 Bluetec 2013 GLK 250 Bluetec |
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On a 124 chassis in addition to the two rear mounts which attach to the differential rear cover, there is a single front differential mount that secures the forward end of the differential, it uses a 8 mm Allen head bolt which connects to a 17 mm nut which resides above it in a channel of the subframe on passenger side of the differential immediately adjacent to the differential's ABS sensor. There are upper and lower rubber disk mounts that sandwich a tab on the differential. Last edited by Billybob; 09-03-2010 at 08:27 PM. |
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Some folks have stated they have been able to move the differential forward just enough to remove the mounts and to install new mounts, I have never witnessed that being done. I unbolt the axles the driveshaft and the mounts and drop the differential, using a puller or a large bolt/large socket/large washer arraingment remove the old mounts and install new mounts into the same position. I unplug the differential ABS sensor behind the rear seat and push the pigtail and grommet out under the car. I do that because if you try to unbolt the ABS sensor and remove it letting it hang, it is common for the sensor to be damaged in the process, even if you do get the ABS sensor out without damaging it you will need a specific very thin O-ring to get it resealed without leaking, most common O-rings are too thick and will not allow you to reinstall the sensor. The grime on the rear cover is most likely is from differential fluid escaping the vent because it looks like it is on and possibly coming from the top of the differential, although the drive flange seals are often leaking after 150,000 miles. With the differential on the bench you can open it up, remove the clips which secure the drive flanges in place, pull the flanges out and replace the seals. If the front pinion seal is also leaking you can change that but it's a more involved process because you need to ascertain the preload and then replicate that upon re-assembly. The rear muffler section can be dropped and allowed to hang, allowing more space on the drivers side when dealing with the axle on that side. |
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I clearly spoke to the parts reference as "commonly referred to" Quote:
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I'm sure you can find something I'll post elsewhere to be disagreeable with and vent your vitriol. Last edited by Billybob; 09-03-2010 at 09:27 PM. |
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Yes, those with scant knowledge often refer to the final drive as the differential. Fact is the final drive might not contain a differential. Or sometimes we find a differential in the transmission/transfer case of AWD vehicles.
It's not a case of semantics, but one of intelligence and knowledge. |
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Boys, take your playground spat outside. The OP just asked for a little help identifying these parts. Typically called differential bushings, but EPC refers to them as rubber mounts for the axle housing to rear subframe. The photos tell me yours are overdue for replacement. P/N 124-352-77-65
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1988 California version 260E (W124) Anthracite Grey/Palomino Owned since new and still going strong and smooth MBCA member Past Mercedes-Benz: 1986 190E Baby Benz 1967 230 Inherited from mom when she downsized 1959 220S Introduced me to the joys of keepin' 'em goin' There are only 10 kinds of people in the world--those who understand binary and those who don't Last edited by Cal Learner; 09-04-2010 at 07:19 AM. |
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the mounts/bushings in your photos actually look pretty good. the left one is a bit off-center but for instance the ones in my car are much worse. and when they're bad they don't normally make a squeaking noise, more of a clunk. i think the squeak is coming from somewhere else.
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________________ punkinfair |
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I'd say if he can duplicate the noise by pressing up on the final drive, he's found his problem.
On the "semantics" episode, I was siding with ChasH until the statement, well here, I'll quote it: Quote:
And as far as the battle itself, if this would help get peace talks to ensue, in a Mercedes shop, if someone has worked on Mercedes for awhile, with prior mechanical experience, eventually you see the term "final drive" used enough that you start using that instead of the more generic term "differential". Before i was exposed to Mercedes, I know this is the term that was used, either that or just "rear axle". Of course I'm a little older and these terms were used regarding rear wheel drive American cars, before Chevy shocked the world with the Citation! Anyways, when you start to work on Mercedes, the "final drive" name is used a lot, especially in the maintenance sheets, ie "check final drive oil". In the REPAIR info, such as the microfiche sheets, it is usually referred to as the "Center Section". I will also use the term "Punkin' " (pumpkin), ie "don't drop that punkin' on your head!" Some of these terms might be used more or less frequently due to location, maybe? I don't see the big fuss in correcting each other, there are lots of terms like this, differntial, rear axle, final drive, hey you know what is being talked about, big deal. For some reason, I would be more apt to use the term "final drive" when talking about the fluid change, but if I had to REMOVE it, I would say something like "ah crap, the center section has to come out!" It's always strange for a guy who is used to solid rear drive axles to start working on IRS, to me that was always high tech Jag or Corvette stuff, it was a real leap to go into IRS. If someone would ask about the differential though, I knew what was being talked about, no need to do a correction, sort of like if someone offers me a soda, and where I live they always call it "pop" instead, no reason to say "huh?", I know what it is! (and usually I want to say "only if you're out of BEER!"). Gilly
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