Replacement Bolts for the transmission mount?
Thread Starter
Senior Member
Joined: Jul 2014
Posts: 369
Likes: 61
CLS63, S55
Replacement Bolts for the transmission mount?
Are the bolts on the transmission mount just standard 13mm and 17mm hex bolts? or is there anywhere that I can get the actual replacements?
Reason I ask is because I recently took a look at the mount and the previous owner must have over torqued one the bolts because the head is missing.
Reason I ask is because I recently took a look at the mount and the previous owner must have over torqued one the bolts because the head is missing.
Senior Member
Joined: Dec 2010
Posts: 282
Likes: 66
From: Virginia Beach
2005 S600 2005 SL600
Bolts are measured by the thread size and pitch, not the hex head size. Take the old intact bolt out, head down to a good hardware store, match up a new metric bolt by thread size, pitch and length. It's likely an 8mm bolt in 8.8 strength. You could go 10.9 if you like, but there's probably not enough stress on the mount to warrant the higher strength bolt.
The dealer will sell you actual replacements, but they will be expensive....
The dealer will sell you actual replacements, but they will be expensive....
MBWorld Fanatic!
Joined: Dec 2012
Posts: 2,474
Likes: 439
From: Ball Ground, GA (N of Atlanta)
2003 S500 2007 GL450
My only concern is that if you end up with cheap Chinese bolts from a hardware store, there might be two problems. The bolts may not meet the strength rating on the head of the bolt, and the corrosion protection will be very, very low. If you live in an area where the roads are salted, the bolts might rust away the first winter.
