240D third motor mount, t-mount - PeachParts Mercedes-Benz Forum

BodhiBenz1987 · #1 11-09-2009, 04:11 PM

I replaced both engine mounts successfully, and also bought a replacement for the mount behind the oil pan, a t-mount. The mount that's on there has partially disintegrated and the rest is moosh ... but I can't get the big bolt on the crossmember out ... not even with an impact wrench. The car seems to run fine without it, and I've read it's not really necessary, but nonetheless, it bothers me not to finish projects. Is there a trick to that bolt? The "nut" on it is rectangular and doesn't seem to be turnable because of its dimensions. Just curious. Guess I can just leave the mooshy mount there, but I hate to waste the lovely new one I bought.

Biodiesel300TD · #2 11-09-2009, 05:09 PM

If I remember correctly that big bolt is welded on, and you have to take the nut off the other end.

tankowner · #3 11-09-2009, 05:25 PM

I remember that being somewhat of a bear to change on my '83 240D. I can't recall exactly, I would have to take a look, but I am pretty sure the bolt head was on the back of the cross member - it wasn't square though, just regular style. Although, there was this little metal retaining piece that swung over the bolt head. I didn't really understand it, but I guess it is there to keep the bolt from coming out should it ever loosen.

Anyway, I had the car up on ramps, and the way I got it to break free was to get a rachet on it so that the handle was pointing down towards the ground. Then, I slid my legs under the car from the driver's side and, while holding on tight to something underneath, I used my foot against the rachet handle to break it free. I was on tight and I knew I wasn't going to be able to break it with just my upper body strength in that cramped position.

BodhiBenz1987 · #4 11-09-2009, 05:47 PM

Quote:

Originally Posted by tankowner

Although, there was this little metal retaining piece that swung over the bolt head. I didn't really understand it, but I guess it is there to keep the bolt from coming out should it ever loosen.

If that bolt every undergoes such trauma as to loosen it's weld job, I'm pretty sure that metal tab ain't gonna be much of a last line of defense.

I'll post a pic of the "nut" later, but it's odd. Could maybe turn it with channel locks, but it looks like it would just jam, even if it turned freely. The bolt head won't budge. I got an impact wrench securely on it, and it was no match for the bolt. Which is why I wondered if that funny nut was the key ...

tankowner · #5 11-09-2009, 07:19 PM

Quote:

Originally Posted by BodhiBenz1987

If that bolt every undergoes such trauma as to loosen it's weld job, I'm pretty sure that metal tab ain't gonna be much of a last line of defense.

Agreed, but mine wasn't welded. Unless, I am not recalling the correct orientation of the bolt. I'll have to look.

BodhiBenz1987 · #6 11-09-2009, 07:22 PM

Quote:

Originally Posted by tankowner

Agreed, but mine wasn't welded. Unless, I am not recalling the correct orientation of the bolt. I'll have to look.

I didn't think mine was either ... it has a washer under it, which generally leads me to believe it will come out. Also, the EPC shows the bolt, washer and "nut" as separate parts that can be ordered, which wouldn't make sense if the bolt was part of the frame.