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  #1  
Old 08-10-2009, 12:26 PM
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Tearing up Engine Mounts

For some reason I am tearing through engine mounts.

Last year, I replaced both front engine mounts and engine shock aboarbers (had just bought the car). Since then, I have had to replace the Left front (injector pump side) engine mount 2 times before and is needed a new mount now.

The mount is not getting saturated by oil or gas (luckily no leaks in the area).

What could be causing the mount to continually fail?

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(RIP Sept '10) 83 300SD Turbo Diesel (aka "Rocky")
(RIP April '10 - Accident) 86 Chevy M1009 CUCV (Blazer) - 6.2L Diesel (aka "Ogre")
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  #2  
Old 08-10-2009, 12:35 PM
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Real bad engine shaking.
You could have bought second rate mounts also.

If I was going through mounts that fast, I'd check:
-Valve adjustment
-IP Timing, Chain stretch
-Injector Service

Most of these cars have their original mounts in semi-decent condition unless they've got oil or fuel leaking on them. Good luck, I'm sure its not fun to replace those more than once in such a short time span.
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  #3  
Old 08-10-2009, 01:09 PM
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What brand are the mounts?

And does your car shake from side to side at idle?


If you want them to last, OEM MB motor mounts are the only way to go.
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-diesel is not just a fuel, its a way of life-
'15 GLK250 Bluetec 90k - mine - (OC-91,200)
'17 Metris(VITO!) - 18k - wifes (OC-25k)
'01 E320 Wagon - 161k - mine (OC-165,000)
'01 E320 - 180k - dad's (OC-182,500)
'07 E350 Wagon - 134k - dad's (OC-139,500)
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  #4  
Old 08-10-2009, 01:55 PM
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Yes, it shakes a little from side to side at idle.

They were Corteco/Meyle mounts, I believe.
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Big Fred

(RIP Sept '10) 83 300SD Turbo Diesel (aka "Rocky")
(RIP April '10 - Accident) 86 Chevy M1009 CUCV (Blazer) - 6.2L Diesel (aka "Ogre")
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  #5  
Old 08-10-2009, 03:44 PM
LarryBible
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It's that frame twisting 90 horsepower that's just ripping them to pieces.
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  #6  
Old 08-10-2009, 06:30 PM
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Quote:
Originally Posted by bigfredb View Post
Yes, it shakes a little from side to side at idle.

They were Corteco/Meyle mounts, I believe.

Those are the worst brand of mounts. I believe now they are even made in CHINA. Use only Lemforder brand or dealer OEM MB mounts, and they will last much longer. They will also cost 3-4x as much, but for good reason.
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-diesel is not just a fuel, its a way of life-
'15 GLK250 Bluetec 90k - mine - (OC-91,200)
'17 Metris(VITO!) - 18k - wifes (OC-25k)
'01 E320 Wagon - 161k - mine (OC-165,000)
'01 E320 - 180k - dad's (OC-182,500)
'07 E350 Wagon - 134k - dad's (OC-139,500)
'01 SL500 - 56k - dad's (OC-59,000)
'16 E400 4matic Sedan - 81k - Brothers (OC-88,000)
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  #7  
Old 08-10-2009, 07:49 PM
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Second that on the Corteco. Mine collapsed in under 10,000 miles.
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  #8  
Old 08-11-2009, 06:20 AM
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Quote:
Originally Posted by bigfredb View Post
Yes, it shakes a little from side to side at idle.

They were Corteco/Meyle mounts, I believe.

If you happened to buy them from a certain german-sounding internet company in arizona, they have a one-year warranty.

Sounds like you might want to see what Phil has, probably better quality than the ones you have.
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  #9  
Old 08-11-2009, 07:24 AM
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Quote:
Originally Posted by pawoSD View Post
Those are the worst brand of mounts. I believe now they are even made in CHINA. Use only Lemforder brand or dealer OEM MB mounts, and they will last much longer. They will also cost 3-4x as much, but for good reason.
i agree: lemforder or oem ones from the dealer. goes for other chassis, too.
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  #10  
Old 08-11-2009, 01:46 PM
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Thanks for the heads up on OEM or Lemforder.

Yes I did order from "that place" in AZ. Will look into the warranty. Guess I need to call the stealership about a mount.

I haven't replaced the Transmission mount yet. Is this something that might be contributing to the problem? If so, where is the trani mount and how do I check it?
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(RIP Sept '10) 83 300SD Turbo Diesel (aka "Rocky")
(RIP April '10 - Accident) 86 Chevy M1009 CUCV (Blazer) - 6.2L Diesel (aka "Ogre")
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  #11  
Old 08-12-2009, 02:29 PM
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Answer

Quote:
Originally Posted by bigfredb View Post
Thanks for the heads up on OEM or Lemforder.

Yes I did order from "that place" in AZ. Will look into the warranty. Guess I need to call the stealership about a mount.

I haven't replaced the Transmission mount yet.
Is this something that might be contributing to the problem?
If so, where is the trani mount and how do I check it?
A broken transmission mount adds stress/torque to the engine mounts, causing premature failure.

Failure mode:
* Turns to marshmallow goo.
* Rips apart.

Testing:
* Put a board on the transmission oil pan, and lift with a floor jack.
* You are checking for gummie stretch or separation.
Note: A new mount feels like fresh tire side wall rubber.


Other possible causes for broken mounts:

(rare issue, increasing with age) Weak or broken Ip rack return spring, (sloppy/eratic idle).

Ip rack return spring r&r
Ip rack return spring r&r

(Common issue) Weak, broken or superseded rack damper bolt:

so, what does that rack damper bolt (617) actually do?
http://www.peachparts.com/shopforum/diesel-discussion/183139-so-what-does-rack-damper-bolt-617-actually-do.html#post1458468

Part# rack dampener pin for 1985 300SD
http://www.peachparts.com/shopforum/diesel-discussion/120005-part-rack-damper-pin-1985-300sd.html#post858324

Adjusting the Rack Damper Bolt
http://articles.mbz.org/engine/diesel/rackbolt/

Replacing Rack dampener pin
http://www.peachparts.com/shopforum/diesel-discussion/176580-replacing-rack-dampener-pin.html#post1391845



Topic related threads:

Bad engine mounts
http://www.peachparts.com/shopforum/diesel-discussion/121286-bad-engine-mounts-post868339.html

Heat shield OM617 engine mount
http://www.peachparts.com/shopforum/diesel-discussion/121452-heat-shield-om617-engine-mount-post873875.html

Engine / motor mount DIY
http://www.peachparts.com/shopforum/diesel-discussion/146482-engine-motor-mount-diy.html#post1104023

300D engine mount blues
http://www.peachparts.com/shopforum/diesel-discussion/109264-300d-engine-mount-blues.html#post758340



Have a great day.
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Tearing up Engine Mounts-w126_300sd-trans-mount-location.jpg  
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Last edited by whunter; 08-12-2009 at 02:45 PM.
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  #12  
Old 08-17-2009, 12:00 PM
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Thanks everyone for your help.

Called the Stealership to get an engine mount ('cause I wanted to fix it asap). . . they wanted $111.84 !

Well, that was enough to order online. Got a Lemforder engine mount (along with an oil filter, a spin-on fuel filter, a power steering filter, new window wiper inserts, a transmission mount, and a new accelerator pedal) for $64 to be delivered to my doorstep.

Will update when complete.
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Big Fred

(RIP Sept '10) 83 300SD Turbo Diesel (aka "Rocky")
(RIP April '10 - Accident) 86 Chevy M1009 CUCV (Blazer) - 6.2L Diesel (aka "Ogre")
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  #13  
Old 08-17-2009, 12:46 PM
pawoSD's Avatar
Dieselsüchtiger
 
Join Date: Oct 2004
Location: Grand Rapids, MI
Posts: 15,315
Quote:
Originally Posted by bigfredb View Post
Thanks everyone for your help.

Called the Stealership to get an engine mount ('cause I wanted to fix it asap). . . they wanted $111.84 !

Well, that was enough to order online. Got a Lemforder engine mount (along with an oil filter, a spin-on fuel filter, a power steering filter, new window wiper inserts, a transmission mount, and a new accelerator pedal) for $64 to be delivered to my doorstep.

Will update when complete.
Awesome, on-line is pretty much the only place to reasonably buy parts for (any) car....dealers charge about 5x on most anything. Except the common maintenance stuff like spark plugs.
__________________
-diesel is not just a fuel, its a way of life-
'15 GLK250 Bluetec 90k - mine - (OC-91,200)
'17 Metris(VITO!) - 18k - wifes (OC-25k)
'01 E320 Wagon - 161k - mine (OC-165,000)
'01 E320 - 180k - dad's (OC-182,500)
'07 E350 Wagon - 134k - dad's (OC-139,500)
'01 SL500 - 56k - dad's (OC-59,000)
'16 E400 4matic Sedan - 81k - Brothers (OC-88,000)
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  #14  
Old 02-15-2010, 03:17 PM
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Join Date: Sep 2006
Posts: 298
Quote:
Originally Posted by whunter View Post
A broken transmission mount adds stress/torque to the engine mounts, causing premature failure.

Failure mode:
* Turns to marshmallow goo.
* Rips apart.

Testing:
* Put a board on the transmission oil pan, and lift with a floor jack.
* You are checking for gummie stretch or separation.
Note: A new mount feels like fresh tire side wall rubber.


Other possible causes for broken mounts:

(rare issue, increasing with age) Weak or broken Ip rack return spring, (sloppy/eratic idle).

Ip rack return spring r&r
Ip rack return spring r&r

(Common issue) Weak, broken or superseded rack damper bolt:

so, what does that rack damper bolt (617) actually do?
http://www.peachparts.com/shopforum/showthread.php?p=1458468

Part# rack dampener pin for 1985 300SD
http://www.peachparts.com/shopforum/showthread.php?p=858324

Adjusting the Rack Damper Bolt
http://articles.mbz.org/engine/diesel/rackbolt/

Replacing Rack dampener pin
http://www.peachparts.com/shopforum/showthread.php?p=1391845



Topic related threads:

Bad engine mounts
http://www.peachparts.com/shopforum/showthread.php?p=868339

Heat shield OM617 engine mount
http://www.peachparts.com/shopforum/showthread.php?p=873875

Engine / motor mount DIY
http://www.peachparts.com/shopforum/showthread.php?p=1104023

300D engine mount blues
http://www.peachparts.com/shopforum/showthread.php?p=758340



Have a great day.

One troubleshooting item on the rack dampener bolt that helped me was the reference to shaking hot vs. cold. It wasn't as noticeable when I first started the car at cold. It smoothed out with a bit of idle. 850-900 RPM. It seemed worst right after I got off of the highway.

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