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Motor mount installation

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3 replies [Last post]
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bnzowner's picture
The Colony, TX
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Joined: July 7th, 1998

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61

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2006 ML350
1985 380SL
1977 300D

Seems with age, things with rubber need to be replaced. Well the motor mounts have served it's life and definitely need replacing. My wife complains about the motion when we are at idle and says it's worse than the spin cycle on the washing machine! HA Anyways, I've looked at threads in the past and have done the test with rocking the engine side to side....no movement....so therefore it's time. Is this an easy task to be able to do at home and if so, how or whats the best way to replace them?

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Maxbumpo's picture
Mount Pleasant, SC
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1995 E300 Diesel
1987 300TDT
Re: Motor mount installation

The procedure is in the MB service manual, but it really is quite simple. Basically, loosen the bottom and top bolts, jack up the engine, remove bolts and mounts, install new with hand tight bolts, lower and torque to spec.

There may be an engine shock to disconnect, watch the clearance of the fan and the exhaust manifold, do one side at a time, put block of wood between jack and oil pan.

Consider also replacing the rear engine mount (aka transmission mount), the flex discs, the drive-shaft carrier bearing mount and the differential mount. If the rubber for the engine mounts is dead, so is all the rest...

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Max Dillon
Charleston SC
'87 300TD, 334k miles (head is off, getting ready to install a different used head...)
'95 E300 Diesel, 348k miles (daily driving duty)
'73 Balboa 20

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bnzowner's picture
The Colony, TX
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Joined: July 7th, 1998

Posts:
61

Vehicles
2006 ML350
1985 380SL
1977 300D
Re: Motor mount installation

Yeah...
I've already replaced the carrier bearing support and had the shaft and all balanced as well. I've looked at the flex disks and they are in good shape. Is it okay to put a block of wood on the oil pan? Wont it cause the oil pan to bend? sounds pretty easy. Would this task be easy for a novice? And, I have the service manuals volumes 1 and 2 for the 123 car. Seems like the Haynes manual is easier to understand rather than the Mercedes manuals. And where would the transmission mount be located? and is it easy to replace as well?

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Biodiesel300TD's picture
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Re: Motor mount installation

I've done motor mounts on several 123's it's pretty easy. As far as the wood, I generally try to find a good wide piece to use, it's spreads out the pressure so nothing bends. Make sure you remove the nuts from the top of the engine shocks if you have them. You'll destroy the shock mounts if you don't. Do one side at a time and make sure you get the bolt threaded in by hand first, especially the one from the bottom. The mount arm is aluminum and you strip it in a hurry if you're not careful. Asking me how I know.:p

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Andrew  <> 1978 240D ~ Flo ~307k mi <> 2004 VW Jetta Wagon TDI ~ Her Car ~ 115k mi <> 1982 300TD ~ Winnie ~ Sold at 178k mi <> 1977 300D ~ Sold

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