Transmission Mount (140-240-03-18) NLA: Aftermarket now available 8/2025

[winmutt]

Moderator update: There is now an aftermarket reproduction available from Kurth in Germany, see post #39 for details.

Suggestions? I've got a reman inbound from Sunvalley. At this point it looks like I am going to get a tube of flashing caulk and "reman" my mount.

 

[036]

250 US$

A1402400318 Mercedes - Silent block A 140 240 03 18 - price on EXIST.AE

Buy Silent block Mercedes A 140 240 03 18 ⭐ Parts catalogs for all famous spare parts brands. Automotive parts manager.

exist.ae

 

[gerryvz]

I recommend noting what the part is in the title of the post, not just the part number. It helps forum members determine what the thread is about, as most folks do not know individual part numbers.

In this case, the thread is about the NLA status of the transmission mount for the E500E, from MB.




I would recommend scouring Google and eBay to find NOS parts. Certainly there are going to be some out there.

 

[Jlaa]

@jhodg5ck at Blue Ridge MB refills existing trans mounts with polyurethane as a workaround since the original part is NLA.

I remember that @nocfn told me that @jhodg5ck uses this:


As well, @dreaming.haze has told me that this is popular as well:

 

[nocfn]

yep those both work well.

 

[AMG5PT4]

So, this tranny mount is found on all w140 V8’s and R129 V8’s and w124 V8’s with the M119?

 

[sheward]

I cannot confirm the W140 chassis however the R129 up to 1995 uses a different mount shared with the W124 6-cylinder cars.

 

[gsxr]

 

[sheward]

I searched the number on a trans mount I acquired with a R129 car. That no. is 124 240 0618.

Dave. Can you tell me what it is I have? The search led me to what I believe was a MB site, not Ebay or equivalent sellers.

124-240-06-18 - Engine Mount 1954-1993 Mercedes-Benz | Mercedes-Benz USA Parts

Order your OEM Engine Mount (1242400618) for your 1954-1993 Mercedes-Benz vehicle from the official Mercedes-Benz USA parts store - nationwide delivery!

mbparts.mbusa.com

Thanks for the correction. Feel free to delete this post.

 

[gsxr]

I searched the number on a trans mount I acquired with a R129 car. That no. is 124 240 0618.

Dave. Can you tell me what it is I have? The search led me to what I believe was a MB site, not Ebay or equivalent sellers.

Drew, p/n 124-240-06-18 is the standard mount for pretty much all 124 and 201 chassis (except V8 models)... and, this is also used on the 6/8-cyl R129! Screenshot below from EPC.

The 124.034/036 rear mount is shared with the R129+M120, it's one beefy piece of hardware. I suspect it tends to be over-replaced.

 

[winmutt]

I recommend noting what the part is in the title of the post, not just the part number. It helps forum members determine what the thread is about, as most folks do not know individual part numbers.

In this case, the thread is about the NLA status of the transmission mount for the E500E, from MB.

View attachment 192833


I would recommend scouring Google and eBay to find NOS parts. Certainly there are going to be some out there.

Good call, sorry about that, I see no way to amend my subject.


I've scoured, hence my post.

 

[AMG5PT4]

Classic, so a 140 P/N Mount is specifically not used on a 140 chassis….

 

[gsxr]

Classic, so a 140 P/N Mount is specifically not used on a 140 chassis….

Yup! Sometimes the part number prefix does not match the chassis which use the part. This isn't common, but I've seen it happen more than once...

Clarification: I meant it is not common for a part number prefix to indicate a chassis, like this mount with a 140- prefix, yet that part was never used on the 140 chassis. It is very common for a part to be used across multiple chassis, e.g. to have a 201- or 126- prefix part used on the 124.

 

[gerryvz]

Classic, so a 140 P/N Mount is specifically not used on a 140 chassis….

Yup! Sometimes the part number prefix does not match the chassis which use the part. This isn't common, but I've seen it happen more than once...

This situation is actually much more common than many people think.

And, contrary to commonly-held opinion, just because a part number starts with a specific chassis number, DOES NOT AUTOMATICALLY MEAN that it is appropriate (or in some cases, ever was appropriate) for that chassis.

In other situations, a part (number) may have been once spec'd/used for an application on a specific chassis, but was later superseded out to another updated part.....yet the part was retained (using the original part number) for other applications on other chassis.

There are plenty of part numbers on the .036 from much earlier chassis such as the 108, 116, and the 123, and so on. The oil pump pickup boot and the rubber headlight/windscreen pump washer grommets are a couple of examples of this right off the top of my head.

 

[nocfn]

The 126 went thru the 3rd engine mount drama (transmission) a while back and it turns out that a different chassis uses the same mount with a different part number. Don't hold me to it but the 116 prefix comes to mind for that as well.

 

[AMG5PT4]

W140 chassis, R129 chassis and W124 034/036 all came out about the same time with the M119 (1991/1992). This is not a predated chassis like the W123 (1975) vs the W126 (1981). Seems clear to me the tranny mount was intended to be used with the W140 but something caused the mount to not work.

 

[Maxxximus]

Can someone tell, what is the resource of this mount? I have changed it 5 years ago, or 20k kilometres. And today my mechanic told me that it needs to be changed. Seems very little, in my opinion, considering that it was a new original part.

 

[gerryvz]

Can someone tell, what is the resource of this mount? I have changed it 5 years ago, or 20k kilometres. And today my mechanic told me that it needs to be changed. Seems very little, in my opinion, considering that it was a new original part.

It should be able to go 100,000km (60,000+ miles). I think you need a second opinion about it being bad. UNLESS the current replacement from 5 years ago was a cheap Chinese aftermarket part. If it was an MB part, then it should be good for 80,000-100,000 kms, or even more.

 

[Maxxximus]

It should be able to go 100,000km (60,000+ miles). I think you need a second opinion about it being bad. UNLESS the current replacement from 5 years ago was a cheap Chinese aftermarket part. If it was an MB part, then it should be good for 80,000-100,000 kms, or even more.

It was original OEM part...

 

[Maxxximus]

It should be able to go 100,000km (60,000+ miles). I think you need a second opinion about it being bad. UNLESS the current replacement from 5 years ago was a cheap Chinese aftermarket part. If it was an MB part, then it should be good for 80,000-100,000 kms, or even more.

Don't think another opinion needed...This is highly qualified mechanic. He showed me that this mount squeezes down with fingers.

 

[phoenix217]

I confirm, the A1402400318 is NLA in Germany. Would the A1402400818 (also NLA) fit into the E500? It's used in the W140 S420/S500. I used the Vaico aftermarket variant and it's working fine.

 

[Maxxximus]

I confirm, the A1402400318 is NLA in Germany. Would the A1402400818 (also NLA) fit into the E500? It's used in the W140 S420/S500. I used the Vaico aftermarked variant and it's working fine.

140 240 08 18 doesn't fit E500/E420. We tried it today

 

[phoenix217]

140 240 08 18 doesn't fit E500/E420. We tried it today

Because of the notch at the back, which is turned differently?

 

[Maxxximus]

Because of the notch at the back, which is turned differently?

If it was only because of notch, it wouldn't be a problem. Its bigger than 034/036 mount and has different/another form mounting places on the sides

 

[phoenix217]

If it was only because of notch, it wouldn't be a problem. Its bigger than 034/036 mount and has different/another form mounting places on the sides

I can contact some vendors in the EU. Maybe they have some in stock. But that has to wait till monday at least.

Otherwise: Time for reproduction.

 

[gsxr]

Can someone tell, what is the resource of this mount? I have changed it 5 years ago, or 20k kilometres. And today my mechanic told me that it needs to be changed. Seems very little, in my opinion, considering that it was a new original part.

Your highly qualified mechanic may not be highly knowledgeable with this specific mount or application. Gerry is correct, there's no way an OE/Genuine mount has failed in 20kkm. Unless the rubber oil soaked, it's fine. Leave it alone. These mounts can last decades / hundreds of thousands of km's.

Don't think another opinion needed...This is highly qualified mechanic. He showed me that this mount squeezes down with fingers.

It's rubber. It's meant to move. Squeezing with your fingers is SUPPOSED to move it! If the mount were solid, it would transmit NVH to the passenger compartment.

 

[Black 034]

I bought a transmission mount for my 1993 400E and the one every store is showing is not correct as it has 3 holes on base plate in a triangle configuration instead of two on center line fore to aft. Old mount is orginal one with the 140 2400318 part number. The one I bought is a Pioneer and looks fairy robust and made in Taiwan. Please advise where I can get a new mount or maybe fill the old one with expoxy/rubber.

Thanks,
Bruce F.

 

[Jlaa]

I bought a transmission mount for my 1993 400E and the one every store is showing is not correct as it has 3 holes on base plate in a triangle configuration instead of two on center line fore to aft. Old mount is orginal one with the 140 2400318 part number. The one I bought is a Pioneer and looks fairy robust and made in Taiwan. Please advise where I can get a new mount or maybe fill the old one with expoxy/rubber.

Thanks,
Bruce F.

You can get a new one in Doc's Delorean Time Machine if you go back to 2017.
This is what @nocfn mentioned to me that @jhodg5ck uses to fill old ones:

 

[gsxr]

I bought a transmission mount for my 1993 400E and the one every store is showing is not correct as it has 3 holes on base plate in a triangle configuration instead of two on center line fore to aft. Old mount is orginal one with the 140 2400318 part number. The one I bought is a Pioneer and looks fairy robust and made in Taiwan. Please advise where I can get a new mount or maybe fill the old one with expoxy/rubber.

Thanks,
Bruce F.

Bruce, is this what you received? I'm seeing this obviously-incorrect mount shown with p/n 140-240-03-18. It will take a while for customers to complain and eventually get the various vendors to fix their websites.

Transmission Mount For 1992-1995 Mercedes-Benz Vehicles FEBI | eBay

FEBI PARTS. TRANSMISSION MOUNT FOR. I WILL DOUBLE CHECK FOR THE CORRECT PARTS FOR YOUR VEHICLE !

www.ebay.com

 

[gsxr]

But yeah, unless your old mount is completely destroyed, just re-install it... optionally fill with DEFCON5 as @Jlaa showed above.

I believe Blue Ridge MB is working on a suitable aftermarket replacement but AFAIK this is not yet available. (@jhodg5ck ?)

 

[Black 034]

Yeah thats the one I got from parts geek. I sent them pictures of the MB one off my car along with picture of 3 hole unit. Only problem with the Devcon is cost $100 plus more than a new MB mount if it wasn't NLA.

I have a vibration at 40 mph slowing down and I have trying to get Blueridge to replace my center bearing, ujoint and boot but not happening and I can't get the exhaust off on my back on jack stands.

I have new flex discs, overhauled rear axles, new rear suspension, new rear wheel bearings, new MB motor mounts. I will attache picture of old mount, which does not look too bad for 260,000 miles.

 

[Black 034]

Do I need to wedge something under it to center bolt hole before filling with Devcon?

 

[gsxr]

Do I need to wedge something under it to center bolt hole before filling with Devcon?

Probably wouldn't hurt. Even brand new mounts will "sag" noticeably immediately after installation, with the weight of the transmission resting on it.

On the bright side, your old mount looks serviceable despite the mileage. As long as the rubber isn't oil-soaked or ripped, it should be fixable.

And yeah, the exhaust is not fun to separate at the rear of the catalysts. Blue Ridge all booked up for a while, eh?

 

[Jlaa]

Only problem with the Devcon is cost $100 plus more than a new MB mount if it wasn't NLA.

Yeah I hear you, but essentially "$100 + more" is not valid ---- because the original MB mount price is basically infinite since it is NLA.

 

[Black 034]

Well I am 72 and have done all the work describe above by myself on jack stands. I also replaced both engine mounts, rebuild lower harness, new brushes in alternator, new upper timing chain guides. new hoses, transmission service, new power steering and transmission hoses, so kinda of tired and although I only spent a couple of grand on everything I am ready to drive it now. I finally got 4 16x8 8 hole 036 wheels, new tires and an alignment by someone that actually knew what they were doing.

 

[StefanSK]

But yeah, unless your old mount is completely destroyed, just re-install it... optionally fill with DEFCON5 as @Jlaa showed above.

I believe Blue Ridge MB is working on a suitable aftermarket replacement but AFAIK this is not yet available. (@jhodg5ck ?)

Can anybody advise about how to refill such a mount? I am missing any idea … thanks!

 

[Black 034]

I put a piece of soft wood under the bottom portion after wedging it back to center and then filled with the 3M 08609 window-weld suggested on this post.

 

[Black 034]

 

[MercEdi]

FYI, Kurth Classics from Germany now offers a repro Transmission mount for our beloved 034/036 cars.

The first batch sold out quick, but the next one should be available soon.

Mercedes W124 500e Getriebelager (ersetzt A1402400318)

- Passend für W124 500E/ E500 sowie - R129 600SL/ SL600 - Hochwertige Reproduktion - Ersetzt A1402400318 - Hergestellt aus Edelstahl/ VA

kurth-classics-autoparts.de

 

[Jlaa]

FYI, Kurth Classics from Germany now offers a repro Transmission mount for our beloved 034/036 cars. The first batch sold out quick, but the next one should be available soon.

View attachment 221966

Mercedes W124 500e Getriebelager (ersetzt A1402400318)

- Passend für W124 500E/ E500 sowie - R129 600SL/ SL600 - Hochwertige Reproduktion - Ersetzt A1402400318 - Hergestellt aus Edelstahl/ VA

kurth-classics-autoparts.de

Ohhh. Thanks for alerting us to this!

 

[gsxr]

FYI, Kurth Classics from Germany now offers a repro Transmission mount for our beloved 034/036 cars.

The first batch sold out quick, but the next one should be available soon.

Mercedes W124 500e Getriebelager (ersetzt A1402400318)

- Passend für W124 500E/ E500 sowie - R129 600SL/ SL600 - Hochwertige Reproduktion - Ersetzt A1402400318 - Hergestellt aus Edelstahl/ VA

kurth-classics-autoparts.de

Thank you, @MercEdi! I have updated the title of this thread.

 

[cmmwpi]

FYI, Kurth Classics from Germany now offers a repro Transmission mount for our beloved 034/036 cars.

The first batch sold out quick, but the next one should be available soon.

Mercedes W124 500e Getriebelager (ersetzt A1402400318)

- Passend für W124 500E/ E500 sowie - R129 600SL/ SL600 - Hochwertige Reproduktion - Ersetzt A1402400318 - Hergestellt aus Edelstahl/ VA

kurth-classics-autoparts.de

View attachment 221968

View attachment 221966

Dang! Just missed it. Any idea how we can be notified when another batch is available? Thanks for the heads up though!

 

[MercEdi]

@cmmwpi I asked them about it and they said they will notify me via email when the next batch is ready. I‘ll make a post here then.