Whywould my car shake at idle and in Drive, but not in Neutral or Park? Is this transmission mount related?

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1983 300SD White with Grey interior

Motor Mounts, Rack Damper Pin Adjustment, or possibly something else is loose making a vibration (like the air cleaner or something) Try checking those things and it might expose the problem....

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-diesel is not just a fuel, its a way of life-
'15 GLK250 Bluetec 118k - mine - (OC-123,800)
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'09 Sprinter 3500 Winnebago View - 62k (OC - 67k)
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but not so bad in neutral, I have two busted Air cleaner mounts (hurry up phil) and my Motor mounts are so bad the tranny hits the tunnel when I turn left...soon to be fixed I promise... anyone wanna help me name my car?
anyway the best reason I can come up with is while under a load, but not up to smooth rpm, the motor reacts strongly to the broken parts. a 5 cylinder motor is going to be unbalanced by nature simply due to 360* not easilly divisable by 5 smoothly 72degrees is kinda uneven on a crankshaft, and diesel is pretty vibration prone as well. combine all this with worn out parts and under a load... noisy!
John

Mine did this, and replacing the motor mounts took care of it.

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Jimmy L.
'05 Acura TL 6MT
2001 ML430 My Spare

Gone:
'95 E300 188K "Batmobile" Texas Unfriendly Black
'85 300TD 235K "The Wagon" Texas Friendly White
'80 240D 154K "China" Scar engine installed
'81 300TD 240K "Smash"
'80 240D 230K "The Squash"
'81 240D 293K"Scar" Rear ended harder than Elton John

i have relativeley new motr mounts (less than a year old) and just put a new air cleaner bracket with new mounts and heat shields, so I guess its safe to assume its the tranny mounts. Is this hard job to do? I have no idea whats involved.

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1983 300SD White with Grey interior

Replacing the mounts is an easy but sligtly dirty job. Steam clean the engine bay before you do it, you will be much happier.

Call your car nervous.

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1981 300D 147k
1998 VW Jetta Tdi 320k
2001 Dodge Ram 2500 141k
1979 300D 234k (sold)
1984 300D "Astor" 262k(sold)
Mercedes How-To and Repair Pictorials
I love the smell of diesel smoke in my hair

Replacing the rear mount is simple. Support the tranny with a big block of wood under the pan. Push up a little, you can go too far, so make sure you have clearance in the tunnel above the driveshaft. You have to remove the tray that holds the mount (4bolts). Should take you 30 minutes or so. Much easier then the other two motor mounts. Mine was actually seperated, the rubber was puffed up like a sponge. Never changed in 22 years. If you need a step by step, I'll be glad to write it up.

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Mercury is a boxer

1984 300d
1999 Prelude
Medici road bike
Klein touring bike
Klein mtn bike

I had some shaking problem and it ended up being one of the motor shocks was bad..

I had the same problem.....passenger side motor mount (destroyed from years of heat exposure).

I have the engine shock (190d 1984) completely removed.

I replaced both motor mounts and experience no vibration anymore in D...(nor in R)

I've heard of 'new' motor mounts going bad...send pics of the mounts if you can.

-Mike

You state you need mounts, so I'd do that first. If it still shakes, my bet is on a Rack Dampner Pin adjustment.

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85 300CD
83 300TD
78 240D (daughter)

hello. this is my first post ever so bear with me. thank you. i too have a shaking motor. it's a 300td 1982, china blue. i bought it at an auction not too long ago and have taken it upon myself to fix those things that require attention. the motor shakes something fierce and has from the get go. i replaced the motor mounts with the help of a friend and it seemed as though the shaking only got worse. with a little luck i found my way here and through reading up on similar problems, i am leaning towards replacing the engine shocks and shock mounts as well. does anyone have any advice in this regard? do i need to lift up the motor again? should i try something else first? the car shakes worse in drive than park or nuetral and reverse is some kind of blender shakin. i want to say that i can feel it moving around at up to around 30 mph, but maybe im trippin. please help me out if you can. thank you. shoots

What about the driveshaft rubber donut? I have replaced that before and it does shake in "D" and not in "N" or "P".

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01 Ford Excursion Powerstroke
99 E300 Turbodiesel
91 Vette with 383 motor
05 Polaris Sportsman 800 EFI
06 Polaris Sportsman 500 EFI
03 SeaDoo GTX SC Red
03 SeaDoo GTX SC Yellow
04 Tailgator 21 ft Toy Hauler
11 Harley Davidson 883 SuperLow

the driveshaft rubber donut? does this pastry come by another name? this sundry is one i've never heard of.

Flexible Joint Disc is the official MB name for it. Merkur people call it the GUIBO.

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01 Ford Excursion Powerstroke
99 E300 Turbodiesel
91 Vette with 383 motor
05 Polaris Sportsman 800 EFI
06 Polaris Sportsman 500 EFI
03 SeaDoo GTX SC Red
03 SeaDoo GTX SC Yellow
04 Tailgator 21 ft Toy Hauler
11 Harley Davidson 883 SuperLow

I would second Aklim. If it's shaking in D and not other modes I would have a look at the drivetrain and make sure all is well down there. Can''t hurt to look.

Unless you don't jack it up right.

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Ralph

1985 300D Turbo, CA model
248,650 miles and counting...