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Just wanted to document the process I did for my 2010 E350 4matic motor mounts. It’s a giant pita but if I ever have to do it again it would be terrible now that I know what I do and do not have to do. They were def shot and now more shaking at idle now.
Here’s what I did:
Disconnect battery
Remove airbox
remove the 2 bottom motor mount bolts from the topside with a swivel and 2 12” extensions.
remove serp belt, and alternator. Disconnect cable from back of alternator and voltage regulator connector. Slide alternator forward and to the side in front of the engine.
Disconnect o2 sensors and remove exhaust from manifold on driver side (left side in US). I removed both sides, but driver side is definitely required.
disconnect top of steering shaft and push shaft back into firewall allowing steering shaft to fall down.
on driver side use the Mercedes motor mount tool to loosen the top bolt of the motor mount. Use a 16mm flex head ratchet wrench to get it loose enough to slip over the top of the motor mount.
lift engine to remove mount. This one will go out the back of the engine where the exhaust and steering shaft were.
reattach top motor mount bolts on driver side.
Lift engine on passenger side until the CV axle hits the frame then you can use the motor mount tool to release the top bolt. This side is a total pain. Work the top bolt with the tool or the ratcheting wrench till it’s loose enough to slide off the motor mount bracket. I actually had to cut the motor mount tool so that it was thin enough to fit between the bolt and the manifold.
remove mount from front of engine where alternator was.
I have a 2 post lift so I used an underhoist lift for the drivers side from the bottom, and a floor jack to lift from the bottom for the passenger side.
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