Solution for collapsed motor mounts

[wwheeler]

In conjunction with S&S Imports, I have developed soft inserts that fit directly under the factory motor mounts. The purpose of these insets is to prevent motor mounts from collapsing over time. When a motor mount collapses or sags in a SL, it causes clearances issues with the valve cover in the engine bay and also smooth operation of shift rods. 

While Mercedes never offered this part, premature mount collapse seems to be more of a problem popping up in recent years. Possibly due to changing motor mount rubber compounds and aftermarket offerings.   

These inserts fit directly under the factory mount and require NO modifications. See attached 1 & 2. The W113 uses (3) inserts. Plates to cover the subframe holes under the W113 motor mounts are also available. See attached 3. These inserts are best used with new mounts, but you can use slightly collapsed motor mounts to restore and maintain the correct engine height. The soft inserts will not transmit more vibration with no noticeable effect at idle.   

190SL inserts are also available and resolve critical engine clearances in that model.
 
Please PM me for more information.     

[Sead]

"Motoranschlagsbegrenzung" so no longer can be used??
https://www.sls-hh-shop.de/en/mercedes-230-280sl-w113/22-enginemounts
Pos 6, 8 and 12...
This prevents engine jump in opposite direction 

[wwheeler]

Yes, if you Drill a hole in the supplied flat plate. Or can use the SLS plate (#12). With the SLS plate, you would need to grind a bit off the insert to compensate for the raised boss on the plate. The motor mount should fit flush with the insert installed.

My understanding is that most leave off off the stop limit bolt. The new inserts will naturally suppress excessive movement with the mount. More or less makes the stop limit irrelevant.   

[dirkbalter]

My understanding is that most leave off off the stop limit bolt. The new inserts will naturally suppress excessive movement with the mount. More or less makes the stop limit irrelevant.   

Why would anybody leave off the stop limit?  Isn't it to prevent the mounts from "lifting up" and possibly causing the engine component's to hit the hood or fire wall?
Wouldn't a sagging motor mount create a bigger gap between the components?
I understand that bad motor mounts should be changed, but how often do these go bad once replaced?
I am trying to understand the problem / benefits.   

[wwheeler]

I am not not a repair shop so I personally do not see the mounts when they come in. The concept was developed in conjunction with S&S imports here in Dallas and they brought the issue of the mounts to my attention. They deal with mostly Sls, W113 and 190SL. My understanding from them is that this issue is more prevalent now than when they were new. Over the years, they have replaced mounts only to have them sag in a few years and needing replacement. The rubber itself is ok, its just the design.

Now when S&S Imports replace the mounts, they use the inserts as a default. There is also a shop in CA that uses these on W113s as well. They have used them many times and is quite happy with the end result.

Hopefully that answers the question.

[Benz Dr.]

So the trans mount, which is the same as a 190SL motor mount, would be a different part from the 113 part you have?

[wwheeler]

The insert for the 190SL motor mount is different in thickness from the rear trans mount. The rear mount has a raised area and therefore the rear insert is thinner than the front. The W113 rear mount also has this raised area but is taller yet. The W113 rear insert part is .605" thick where as the 190SL part is .688". The front 190SL insert with no raised area is .800". When installed, the mount should sit flush on to the metal mounting surface. The insert should fill the cavity and not cause the mount to lift off the mounting surface.   

Good question.

[wwheeler]

To be clear, I have separate kits for various models. all of these have different parts.
- 190SL and Ponton 4 cylinders
- Ponton 6 cylinders
- W113

The Ponton mounts are the weakest, but the W113 benefits from the extra support as well. Significantly extends the life of the mount and maintains correct engine height.