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#1
08-28-2010, 02:55 PM
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How long do OE motor mounts usually last?
On a 603. Just curious. After replacing the front tires on my 87 300D, my neverending highway vibration reduced quite a bit (and the noise is gone!), but I'm definitely still getting a shake in the steering wheel and slight vibration in the floorboard, intermittently between 55-70. It seems to be most noticeable on acceleration, and is (in my nonscientific estimation) more often to occur while going up a very slight incline.
I noticed some very tiny cracks in the motor mounts and I'm wondering if it could be them starting to go? They were replaced 50,000 miles ago (five years). The transmission mount, as far as I know, has never been replaced, so I'm going to do that. Would it be wise to do the motor mounts while I'm at it, or a waste? For whatever it's worth, idle and low speeds are super smooth. As a side question ... the rear linkage on this car is a disaster, and the diff bushings (in the back, that hold it on the subframe) are shot. I plan to have my indy do that job when I get back from London in the fall (technically I can do it, but physically I don't think I can by myself). Can those problems in the rear manifest in vibrations in the front? Poor Bodhi, this has not been his year.  Guess it could sure be worse. At least I've gotten some things solved along the way.
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1987 300D, arctic white/palomino--314,000 miles 1978 240D 4-speed, Euro Delivery, light ivory/bamboo--370,000 miles 2005 Jeep Liberty CRD Limited, light khaki/slate--140,000 miles 2018 Chevy Cruze diesel, 6-speed manual, satin steel metallic/kalahari--19,000 miles 1982 Peugeot 505 diesel, 4-speed manual, blue/blue, 130,000 miles 1995 S320, black/parchment--34,000 miles (Dad's car) 
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#2
08-28-2010, 02:58 PM
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I can't see motor mounts causing a vibration in the wheel that's not felt at idle.
how smooth is your acceleration? it could be the trans mount allowing the motor to tilt down on a hilly climb though. start there and see. if your rear bushings are SHOT then all manner of issues could be felt...
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 560SL convertible 1987 190D 2.5-5SPEED!!!  1987 300TD 2005 Dodge Sprinter 2500 158"WB 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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#3
08-28-2010, 03:52 PM
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Go for the transmission mount...that is an easy job. The mounts are not likely bad after just 5 years and they collapse when bad. The rear bushings (multi-link arms) are significant in tracking at high speeds. As for subframe mounts, I have not done mine yet but at 185k or so, they SEEM to be okay.
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1987 300TDT - 195,000 (Original #14 head) 1993 190E 2.3 - 105,000 1981 300D - 250,000
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#5
08-28-2010, 05:11 PM
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Engine mounts on the 60x engines are usually good for about ten years, give or take.
__________________
 "Buster" in the '95 Our all-Diesel family 1996 E300D (W210) . .338,000 miles Wife's car 2005 E320 CDI . . 113,000 miles My car Santa Rosa population 176,762 (2022) Total. . . . . . . . . . . . 627,762 "Oh lord won't you buy me a Mercedes Benz." -- Janis Joplin, October 1, 1970
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#7
08-28-2010, 06:21 PM
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Quote:
 Last time I had the mounts replaced there was actually fluid coming out of one of the old ones, so it wasn't a tough judgment call.I'll start with the trans mount, I have a new one ready to go. I'd like to do the diff mounts if I can get my hand on the tool, too. There's no question they need to go, one of them is sort of half-collapsed. aaa ... the tires are brand new, at least on the front. I suppose it could be the ball joints or lower control arm bushings, but all look pretty good. It's kind of reaching a point where I'm just replacing things at random and hoping the problem goes away. The tires did make a big difference cruising on the highway, but not completely. And it could still be steering. And I'm not convinced the lug nuts didn't get damaged by the tire shop I used to go to. So basically it just comes down to what order to start replacing things, and I'd like to rule out (or in) whatever I can before doing so. I'll pick up a 13mm bolt and hopefully I can rule out motor mounts.
__________________
1987 300D, arctic white/palomino--314,000 miles 1978 240D 4-speed, Euro Delivery, light ivory/bamboo--370,000 miles 2005 Jeep Liberty CRD Limited, light khaki/slate--140,000 miles 2018 Chevy Cruze diesel, 6-speed manual, satin steel metallic/kalahari--19,000 miles 1982 Peugeot 505 diesel, 4-speed manual, blue/blue, 130,000 miles 1995 S320, black/parchment--34,000 miles (Dad's car)
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#8
08-28-2010, 06:44 PM
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Mine has been shacking too and I have two new transmission mounts sitting in my garage waiting for installation. How hard of a job is it? Would I have to lower the transmission in any way or form?
__________________
1982 300GD Carmine Red (DB3535) Cabriolet Parting Out 1990 300SEL Smoke Silver (Parting out) 1991 350SDL Blackberry Metallic (481)  "The thing is Bob, its not that I'm lazy...its that I just don't care."
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#10
08-28-2010, 07:00 PM
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Quote:
__________________
1987 300D, arctic white/palomino--314,000 miles 1978 240D 4-speed, Euro Delivery, light ivory/bamboo--370,000 miles 2005 Jeep Liberty CRD Limited, light khaki/slate--140,000 miles 2018 Chevy Cruze diesel, 6-speed manual, satin steel metallic/kalahari--19,000 miles 1982 Peugeot 505 diesel, 4-speed manual, blue/blue, 130,000 miles 1995 S320, black/parchment--34,000 miles (Dad's car)
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#11
08-28-2010, 07:51 PM
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Quote:
It does when you don't have a lift....
__________________
1982 300GD Carmine Red (DB3535) Cabriolet Parting Out 1990 300SEL Smoke Silver (Parting out) 1991 350SDL Blackberry Metallic (481) "The thing is Bob, its not that I'm lazy...its that I just don't care."
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#13
08-28-2010, 10:39 PM
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Quote:
I probably wouldn't jack up the car to do the motor mounts ... easier to reach the top bolts with it on the ground. Trans, I'll have to take another look ... a bit snug back there but I fit OK to do the steering damper with wheels on the ground.
__________________
1987 300D, arctic white/palomino--314,000 miles 1978 240D 4-speed, Euro Delivery, light ivory/bamboo--370,000 miles 2005 Jeep Liberty CRD Limited, light khaki/slate--140,000 miles 2018 Chevy Cruze diesel, 6-speed manual, satin steel metallic/kalahari--19,000 miles 1982 Peugeot 505 diesel, 4-speed manual, blue/blue, 130,000 miles 1995 S320, black/parchment--34,000 miles (Dad's car)
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#14
08-28-2010, 11:47 PM
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Mounts are a lot easier job than brakes/ wheel bearings Bodhi !!
You dont need a special tool to check mounts, I just see if my finger fits, if not then the mount has collapsed. Sixto's post takes the guess work out though!! A bit of 1/2" rod or the end of a 1/2" square from a socket extension should work. Normally its the left mount that fails first, too much fuel etc around it. If you have a vibe at speed or under load, the right hand one would need to be checked.
__________________
Grumpy Old Diesel Owners Club group I no longer question authority, I annoy authority. More effect, less effort....  1967 230-6 auto parts car. rust bucket. 1980 300D now parts car 800k miles 1984 300D 500k miles  1987 250td 160k miles English import  2001 jeep turbo diesel 130k miles  1998 jeep tdi ~ followed me home. Needs a turbo. 1968 Ford F750 truck. 6-354 diesel conversion. Other toys ~J.D.,Cat & GM ~ mainly earth moving
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#15
08-29-2010, 12:32 AM
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Alright, I've searched for about an hour and can't find the torque specs for the 87 300D transmission mount anywhere. I found them in a thread this morning and didn't write them down (
 ) and can't find them now. They don't seem to be in my AllData discs and I don't have the print FSM with this job in it. Lots of good threads on the procedure, but ...Can anyone please list the torque for the bolts to hold the trans mount in place? I promise I'll write it down this time.
__________________
1987 300D, arctic white/palomino--314,000 miles 1978 240D 4-speed, Euro Delivery, light ivory/bamboo--370,000 miles 2005 Jeep Liberty CRD Limited, light khaki/slate--140,000 miles 2018 Chevy Cruze diesel, 6-speed manual, satin steel metallic/kalahari--19,000 miles 1982 Peugeot 505 diesel, 4-speed manual, blue/blue, 130,000 miles 1995 S320, black/parchment--34,000 miles (Dad's car)
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