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  #1  
Old 01-26-2011, 09:18 PM
2.5Turbo's Avatar
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Motor mount R&R 1990 300D 2.5 Turbo-138k

I finally got around to replacing my motor mounts today. Last fall I noticed a oily fluid that smelled like tire rubber dripping under the car. It took a while for me to probe around with a screwdriver and find the big crack that had formed in the side of the driver's side motor mount. I had been feeling more and more of the engine especially at shutdown, so two and two added to needing new mounts.

I finally got around to it today after getting higher priority items like the leaking DV seals, bad lifters, glow plugs, and a new style vacuum pump done first. I'm sure the leaking diesel contributed to it, but the driver's side mount was totally trashed (new one on the right for comparison)...



The passenger side mount hadn't leaked yet, but it was noticeably shorter than the new one. The top bolts were a little bit of a pain...a number of extensions and a U-joint were needed to get enough clearance for the breaker bar. Even needed to use a cheater pipe on the 18" bar to break 'em loose. They made quite a crack when they broke loose...for half a second I thought I broke the head off the first one. The bottom allen head bolts weren't nearly as bad, came off pretty easy with the 1/2" ratchet.

Now it's running as smoothly as it should...no more vibrating rear view mirror
Attached Thumbnails
Motor mount R&R 1990 300D 2.5 Turbo-138k-motor_mounts_uyg65465.jpg  
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1990 300D 2.5 Turbo -155k
2000 E430 - 103k
2014 Jeep Grand Cherokee Ecodiesel 4x4 - 11k
2014 VW Passat TDI SE - 7k Bro's Diesel
2006 E320 CDI - 128k Pop's Benz


Pre-glow - A moment of silence in honor of Rudolph Diesel

Last edited by whunter; 01-27-2011 at 06:04 PM. Reason: attached picture
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  #2  
Old 01-27-2011, 08:05 AM
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85 300D 4spd+tow+h4
 
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They all compress like that. I think when they are still good they are supposed to pop back. It sure does make a difference. I was told there is a 13mm clearance check. Get something that is round and 13mm and run it between the cross member from one mount to the other. If it gets stuck, you need new mounts. Never tried it though.
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Old 01-27-2011, 09:12 AM
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on the top bolt, I recommend a GOOD impact wrench. my old IR 550 would not do it. I had to get a new 900FP from harbor freight. popped em right out. I can't imagine trying to do it with breaker bars!!!
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  #4  
Old 01-27-2011, 05:21 PM
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I did mine with a box-end, ... on two cars. Just takes a little adrenalin and some good gloves to protect the knuckles.
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  #5  
Old 01-27-2011, 05:31 PM
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Quote:
Originally Posted by babymog View Post
I did mine with a box-end, ... on two cars. Just takes a little adrenalin and some good gloves to protect the knuckles.
you did the drivers side with a box end....??? congrats.... my younger son was able to do it as well...

i had to spend money to get the drivers side done.
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  #6  
Old 02-11-2011, 09:25 AM
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How do I measure the height of the mounts to determine if they need replacement? I get a lot of vibration when I shut down the engine. Thanks.
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  #7  
Old 02-11-2011, 09:28 AM
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85 300D 4spd+tow+h4
 
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The FSM specifies sticking a 13mm diameter round object between the lower edge of the top part of the mount and the cross member. Never done it but it looks simple enough.
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1987 300D Sturmmachine
1991 300D Nearly Perfect
1994 E320 Cabriolet
1995 E320 Touring
2001 Eurovan FOR SALE
1985 300D car, sold and missed.
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  #8  
Old 02-11-2011, 09:34 AM
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Sounds simple, I agree. Do you have the FSM # so that I can look it up. I've looked around the FSM but haven't yet been able to located anything about this.
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1993 W124 300D 2.5L Turbo, OM602.962
2000 Chevrolet Cavalier, 2.4L DOHC
2002 Ford Explorer, 4.0L SOHC
2005 Toyota Prius, 1.5L

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  #9  
Old 02-11-2011, 10:12 AM
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a finger makes a good gauge- if you can get your fore/index finger in the gap then they're ok (unless you've got really fat fingers of course...) Make sure you check the side nearest the engine. Recently changed one of mine that was knackered after failing the finger test (I had loads of vibration at idle)

Attached Thumbnails
Motor mount R&R 1990 300D 2.5 Turbo-138k-enginemount.jpg  
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1993 320TE M104
---------------------------------------------------
past:

1983 230E W123 M102
1994 E300D S124 OM606 (x2)
1967 250SE W108 M129
1972 280se 3.5 W108 M116
1980 280SE W116 M110
1980 350SE W116 M116
1992 300E W124 M103
1994 E280 W124 M104
----------------------------------------------
"music and women I cannot but give way to, whatever my business" -Pepys

Last edited by whunter; 02-11-2011 at 10:31 AM. Reason: attached picture
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