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#1
01-26-2011, 09:18 PM
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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 
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Dale http://i52.photobucket.com/albums/g1...MG_2277sig.jpg 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
01-27-2011, 08:05 AM
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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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http://superturbodiesel.com/images/sig.04.10.jpg 1995 E420 Schwarz 1995 E300 Weiss #1987 300D Sturmmachine #1991 300D Nearly Perfect #1994 E320 Cabriolet #1995 E320 Touring #1985 300D Sedan OBK #42
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#3
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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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 190D 2.5Turbo 1987 190D 2.5-5SPEED!!!  1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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#4
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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 Gone to the dark side - Jeff
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#5
01-27-2011, 05:31 PM
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Quote:
i had to spend money to get the drivers side done.
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1989 300ce 129k ( facelifted front,updated tail lights, lowered suspension,bilstein sports, lorinser front spoiler, MOMO steering wheel, remus exhaust,stainless steel brake lines). (Gone) 1997 s320 154k (what a ride). Sold with 179k miles. Replaced with Hyundai Equus 1994 e320 Cabriolet 108k  1972 280se 4.5 153k Owned for 12 yrs, sorry I sold it [/SIGPIC]
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#6
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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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 http://www.fuelly.com/sig-us/40601.png
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#7
02-11-2011, 09:28 AM
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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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http://superturbodiesel.com/images/sig.04.10.jpg 1995 E420 Schwarz 1995 E300 Weiss #1987 300D Sturmmachine #1991 300D Nearly Perfect #1994 E320 Cabriolet #1995 E320 Touring #1985 300D Sedan OBK #42
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#8
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 http://www.fuelly.com/sig-us/40601.png
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#9
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)
 
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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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