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#1
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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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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") |
#2
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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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I-------------------------------------1981 300TD, Thistle Green, 140K------------------------------------I
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#3
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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 118k - mine - (OC-123,800) '17 Metris(VITO!) - 37k - wifes (OC-41k) '09 Sprinter 3500 Winnebago View - 62k (OC - 67k) '13 ML350 Bluetec - 95k - dad's (OC-98k) '01 SL500 - 103k(km) - dad's (OC-110,000km) '16 E400 4matic Sedan - 148k - Brothers (OC-155k) |
#4
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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") |
#5
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It's that frame twisting 90 horsepower that's just ripping them to pieces.
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#6
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Quote:
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 118k - mine - (OC-123,800) '17 Metris(VITO!) - 37k - wifes (OC-41k) '09 Sprinter 3500 Winnebago View - 62k (OC - 67k) '13 ML350 Bluetec - 95k - dad's (OC-98k) '01 SL500 - 103k(km) - dad's (OC-110,000km) '16 E400 4matic Sedan - 148k - Brothers (OC-155k) |
#7
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Second that on the Corteco. Mine collapsed in under 10,000 miles.
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Greg Schwall 1983 300SD - 465,000 miles |
#8
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Quote:
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. |
#9
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i agree: lemforder or oem ones from the dealer. goes for other chassis, too.
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#10
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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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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") |
#11
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Answer
Quote:
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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ASE Master Mechanic asemastermechanic@juno.com Prototype R&D/testing: Thermal & Aerodynamic System Engineering (TASE) Senior vehicle instrumentation technician. Noise Vibration and Harshness (NVH). Dynamometer. Heat exchanger durability. HV-A/C Climate Control. Vehicle build. Fleet Durability Technical Quality Auditor. Automotive Technical Writer 1985 300SD 1983 300D 1984 190D 2003 Volvo V70 2002 Honda Civic https://www.boldegoist.com/ Last edited by whunter; 08-12-2009 at 02:45 PM. |
#12
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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") |
#13
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Quote:
__________________
-diesel is not just a fuel, its a way of life- '15 GLK250 Bluetec 118k - mine - (OC-123,800) '17 Metris(VITO!) - 37k - wifes (OC-41k) '09 Sprinter 3500 Winnebago View - 62k (OC - 67k) '13 ML350 Bluetec - 95k - dad's (OC-98k) '01 SL500 - 103k(km) - dad's (OC-110,000km) '16 E400 4matic Sedan - 148k - Brothers (OC-155k) |
#14
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Quote:
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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This area is typically used to brag about one's current or former automobiles. |
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