Engine Mount Part Question
 

So....the new Engine mounts I installed that came in the trunk of the 116 when I bought it have already failed after 3 months.

I'm searching around for new ones and my two usual parts sources (Fastlane and Autopartsworld) both have several choices for the left mount, but only one choice for the right mount and both sources are out of stock.

I had always assumed the engine mount was the same part# for both sides on the 617. It seems when I did my 123 last year it was the same identical part for both sides.

Does anybody know if the 116/617 takes different mounts on each side, or is it the same?

Also...I'm going for the Lemforder or Corteco...think I'm safe with either of those brands?

Thanks,
Sam

Any idea what brand the mounts you installed were?

No idea...but they were obviously new. Foolish of me, I know, to install an unknown part... but lesson learned.

They are now completely flat and I get a lot of vibration, especially on the highway. I can feel it in my gear selector. I can take the engine and rock it back and forth with my hand and I get a lot of movement...more towards the back of the engine. I did replace my transmission mount when I did all this, but I am certain the cause is the engine mounts.

I bet the ones you had that failed were meyle... right before I bought my '84 300SD from Johnhef a year ago, he replaced the motor mounts and tie rods with new meyle parts. The mounts went flat 6 months ago, and all 4 boots on the tie rods are broken. I replaced the tie rods with lems, and the motor mounts with some of an unknown brand he had in a parts car.

So I guess I can't give you any useful advice other than "not meyle" :D

Lemforder is reputable - from Germany. Auothause sells Karlyn mounts, which they told me are made in the USA. I have Karlyns on my 123 and so far, no problem.

I have Karlyns as well...haven't installed them yet...

i think you're safe with lemforder mounts. in fact i have a couple in the trunk of my 300dt if you need a pair

i got lemforders in the mail from ******** i believe. it's been a couple months now but i think that's the brand they sent me. maybe they send you whatever they have in stock, from one of a few brands they carry in stock

Does anybody know if the mounts are the same for left and right?

FSM procedure 22-211 for the 617 says that you should use different motor mounts for each side. However, I have never done this, and have never seen any third party motor mounts listed as specific for either side. If you bought mercedes parts you might be able to get them, but the fact that none of the third parties offer them implies to me that it might not be that important, but I could be wrong.

*EDIT* some third parties do make side specific motor mounts, as stated later in thread *EDIT*

While we're on the topic, my 126.120 is missing the motor mount heat shield that the FSM says I should have... does anyone know what the consequences of this are? Will the rubber just heat up and allow the engine to shake a bit more when hot?

It will probably just reduce the life of the mount.

Is it a heat shield, or a plate to keep oil/fuel from dripping on them?

I always thought it was to keep oil/fuel off them. Petrolium produts will
degrade the rubber.

Charlie

Answer
 

There is a design difference between left and right.

We have both of the mounts in stock.

Left
MB# 1232413013
Fastlane:
http://catalog.peachparts.com/item.wws?sku=W0133-1629653

Right
1232412713
Fastlane:
http://catalog.peachparts.com/item.wws?sku=W0133-1628946








Have a great day.

What is the difference? Visually they seem identical...are they made from a different type of rubber or something?

The exerpt from the FSM in my previous post says that "engine mounts differ with regard to shore hardness", so you're probably exactly right. Shore hardness is a way of quantifying the hardness of the material.

http://en.wikipedia.org/wiki/Shore_durometer

I'm curious just how quantitatively different these parts are, but I suspect that the shore of the rubber in these things is not something the competing manufacturers advertise.

Shore hardness, huh? Who knew? Interesting. I wonder if that is why when I replaced the mount on my '83 240D the one was completely obliterated and the other one (while old and ready to be replaced) was still entact and functioning.

I wonder if this applies to my model as well?

I also wonder if this is why we see complaints of mounts failing very early - some manufacturers selling the same component for left and right, when in fact they should be different.

Do your model have the anti-vibration T mount, located on the bottom of the engine behind the oil pan. I also changed that mount on mine because it was deteriorated due to an oil leak. (Or maybe it was just really old like everything else on the car).

Good point, now that you mention it I realize that I'm not sure. The FSM article that I was looking at repeatedly referred to it as a 'shielding plate', but did not say what it was shielding the mount from. Maybe we can figure it out based on where the shielding plate is used...


The FSM says that shielding plates should be used to protect both mounts for the 617 motor in the 116 and 123 chassis, but is needed on ONLY the right side in the 126. So, what's different? I've never poked around inside a 123 or 116, but the question we'd need to answer is whether something about the left side of the 126 protects the mount from heat or fluids that doesn't in either of the other chassis.

Or maybe the shield just doesn't fit in the 126 engine bay for some reason so they decided to skip it, and this line of investigation won't give us any useful information at all :D

Answer
 

Engine mount heat shield
http://www.peachparts.com/shopforum/mercedes-parts-reference-library/262133-engine-mount-heat-shield.html

Heat shield OM617 engine mount
http://www.peachparts.com/shopforum/diesel-discussion/121452-heat-shield-om617-engine-mount.html



Have a great day.

Pricy little buggers aren`t they?

I have my shields, but haven`t put them on.
Iam usually checking the engine bay before I start the car ea time, so do a
visual for leaks, check oil, brake fluid, coolant etc...........

so catch anything as it happens. not too worried if they are on or not.

I also wasn`t aware of left and right side engine mounts. maybe because of the engine torque pulling on one side and pushing down some on the other depends on R & L.

Charlie

Thanks, more evidence that I should search before I speak.

However, this still doesn't answer the question as to why the FSM (or at least the version of it I have on the CDs) says that a right side heat shield isn't required for the 126.120 chassis. Maybe I should take a gander in mine tomorrow and see if the arm that connects the mount to the engine has something heat-shieldy built into it, or if there's some (relatively) cool engine component nearby blocking line-of-sight to the block. (IP maybe?)

On the other hand, the chassis application for the right side heat shield (part # 126 241 04 34) listed by whunter includes the 126.120 despite what my copy of the FSM says on the matter. Maybe since the FSM was written mercedes changed their mind and decided it was needed on both sides...

brainlair,

You contradict yourself in your 2 posts.

First you say the shield plate "is needed on ONLY the right side in the 126." and then in your last post you say "that a right side heat shield isn't required for the 126.120 chassis.".

I have a 126 and I have no shield on the RIGHT SIDE(Passenger Side). The left side or drivers side closer to the IP has a shield plate.

So the Right side(Passenger) does not need the shield and the left side(Drivers) does need the shield.

I just wanted to clear this up because, when I read your first post, I thought I was in trouble since I only had one shield on the left side.

-pete