A buddy and I ran up to the shop yesterday to install the new motor mounts. Mine had really let go and the engine was flopping like a fish on dry land. It didn't take long to discover that the problem with my mounts was a missing bolt under the driver's side. It turns out that engines don't like sitting still when they're not bolted down.Who woulda thunk it?

Despite that discovery, we threw the new mounts in anyway. The passenger side was sitting a touch low (rubber skirt covering the lower body) and likely took a beating without the driver's side being bolted down. Yes, I torqued down the driver's side bolt.

Anyway, the mounts slid right in with no issues other than the typical fussing you get when changing these mounts. I expected the fat rubber blocks on the wider transmission mount to be a tight fit into the transmission mount bracket but there is still a gap on each side. That allows freedom of movement and does not transfer vibration.

I noticed that the engine didn't seem to move about quite as much when brake torqued. There does not appear to be any unwelcome vibration from the engine making it's way into the chassis. Strangely, though, the engine note under heavy throttle has changed a bit. It just sounds a touch different. I imagine that's from a bit of harmonics previously absorbed by the stock squishy mounts.

The CLK63 Black mounts are 240-240-08-17 and have a dealer cost $30 lower than the standard 220 engine mounts used in our cars. The transmission mount is 171-240-01-18 and is about $80 more than the standard 212-240-08-12 mount used in most applications.

I like them. They make a good foundation for additional performance mods.

Here's a quick look at the trans mounts:

The pics show the CLK63 Black mount on the left and the standard 220 part number on the right.


CLK63 Black on left 220 on right.

CLK63 Black on left. 220 on right.

 

Nice! Thanks for following through and posting this. Do you know if it will fit a W211? First thing I did on my C55 and E55 was engine mounts.

 

Yes, the transmission mount interchanges between the RWD 211/212/203/204/209/220/215/230/207202/219/171 gas V6, V8, and V12 engines.
The motor mounts will fit most anything with a 112, 113, or 275 engine. The CLK63 is obviously included in that, too.

AMG V12s have a different part number but I think they are the same (or similar to) the Black mounts.

 

Thanks for sharing this value info..,,

APPRECIATED..

-;ZAYED;-

 

I just got back from another drive in the car. The engine feels a bit crisper and more responsive. Again, it's not a startling change but I can feel the difference.

It's another little step to take the car closer to what I like.

 

Well, i think i now know exactly what mounts are in my very near future.

Much thanks for the detailed info !

 

Is 171-240-01-18 same as 171-240-01-12 just an updated part?

 

Did you change both the engine mounts and the Trans mounts? I'm having my engine mounts replaced and thinking about including the Trans mounts on that job as well. Is it recommended to them both at the same time, or should I leave the Trans mounts alone?

 

171-240-01-12 is not a valid part number.
The 240-xx-12 sequence is uncommon. All 240-xx-18 sequences will be trans mounts.

 

I changed all three.

There's no reason to not change the trans mount. It's quick and easy. Maybe a 5 minute job if the car is in the air.

 

part number is from your first post thats why i got confused.
I PM'd you regarding the possibility of ordering. thanks

 

Yeah, I see that I goobered the number in the first post. Fixed it now. 171-240-01-18.

 

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I've done this upgrade as well, Very worthwhile and is probably the best oem mount for our applications.

 

just ordered these from FCP. thanks for the review!

 

as long as there isnt any interior cabin rattle or like crazy bad comfort change im in ? anyone encounter any of this

 

feels like stock just more direct...no additional vibration or noise. still a Mercedes.