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Damaged Engine Mount Bolts 123, 126, 201
I can not STRESS this enough..
If the engine mount bolts are even slightly damaged, REPLACE them, don't put bad ones back in... Item Number: 914019008000 Main Category: Mercedes Benz Sub Category: Engine Mechanical Description: Bolt...engine mount to subframe...Application...Chassis: 100, 107, 108, 109, 110, 111, 113, 114, 115, 116, 123, 126, 332, 684 Weight: 0.050 Item Number: 1239900212 Main Category: Mercedes Benz Sub Category: Engine Mechanical Description: Bolt...engine mount to engine support bracket...Application...Chassis: 123, 126, 201 Weight: 0.150 NOTE – All prices on special order parts subject to change without notice. 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; 09-28-2010 at 12:25 AM. |
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Why?
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1987 W201 190D |
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Because next time, they may not come out.
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RRGrassi 70's Southern Pacific #5608 Fairmont A-4 MOW car 13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete. 91 W124 300D Turbo replaced, Pressure W/G actuator installed. 210K 90 Dodge D250 5.9 Cummins/5 speed. 400K |
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If that thread concerning the life of new Motor Mounts to be only 2-3 years is true; it makes sense to get rid of the damaged ones as you may be replacing the mounts in a few years.
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84 300D, 82 Volvo 244Gl Diesel |
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I'm still not clear... what is the issue? rounding out of the hex? Thread galling and seizing in the mount? Should the threads get cleaned up with a die before reinstalling? Anti-seize? Loctite? I just replaced my mounts... didn't notice anything unusual with the bolts.
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1987 W201 190D |
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The hex is easy to round out because dirt and grease gets in the hex hole and does not allow the allen bit to seat properly. My passenger mount's bolt is almost totally rounded out right now. The mount was not bad so I stopped trying to replace it for now...
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1979 240D- 316K miles - VGT Turbo, Intercooler, Stick Shift, Many Other Mods - Daily Driver 1982 300SD - 232K miles - Wife's Daily Driver 1986 560SL - Wife's red speed machine |
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engine mount bolts 123
I replaced the short allen head motor mount to frame bolts buried in the frame with 120 mm long bolts capturing a rubber cushion and washer under the frame. Biggest reason, I have spent a lot of time grinding off/drilling out stripped allen bolts at work, and buried in the frame like they are, original bolts would be inaccessible to a die grinder to cut them off. Also, since manual car doesn't have shock absorber mounts, a little additional rubber vibration isolation is a good thing. To buy these bolt one at a time cheaply, buy "gm starter bolt" from dorman "help" line. Of course, boxes of bolts are cheaper by the each. I've got some 1" thick x 6" wide rubber belting I use to make engine and transmission mounts, use a spade drill to drill holes in it.
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'80 240D biege "Mercey Bird" '80 240D light blue "Slug" '80 300SD dark blue "Theodin" Last edited by IndianaJo; 02-19-2009 at 07:46 AM. Reason: spelling |
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OK, how about this... if the hex rounds out, get a drill bit just larger than the shank of the bolt. The rounded hex will be a nice pilot for the drill. Drill until ye olde bolt head falls off. Lift mount off subframe. No?
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1987 W201 190D |
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OK, then what?? You still have an aluminum engine mount arm that needs a threaded hole for the next engine mount....
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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 |
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I hope I'm not a simpleton, maybe I am. I replaced my mounts about two weeks ago. I think I remember that all the threaded holes are in the mount. The aluminum bracket and the subframe (permanent part of the chassis in the W201) are both clearance holes. It's a W201 190D. Am I missing something?
If I'm wrong and there are threaded holes that get buggered up in more permanent parts, helicoils to the rescue. Really, I'm struggling to understand why these bolts are considered to be a big deal.
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1987 W201 190D |
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It's Not !
And you're correct , simply drill the head off the bolt then remove the aluminum, bracket and unscrew the old bolt .
This is routine service on collage kids cars after they screw it all up .
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-Nate 1982 240D 408,XXX miles Ignorance is the mother of suspicion and fear is the father I did then what I knew how to do ~ now that I know better I do better |
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Confused
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* Damaged parts should be re-used until they totally fail, requiring additional time, money, and/or energy to repair. Sorry, that defies both Logic and Common Sense.. Engine mounts are safety = Heli-Coil® repair should be the LAST resort, it can fail the wrong way during a traffic impact, possibly killing you or others... Example of repair: W123 and W126 engine mount If the two small upper Allen cap screws are damaged/rounded, the mount will NOT come off the frame!!! If the large lower Allen cap screw is damaged/rounded, the engine will not separate from the mount!!! If the inner upper and the lower cap screw are damaged: * You must raise and support the vehicle high enough for drill access underneath * Drill the head off the lower bolt * Raise and support the engine * Drill, saw, or grind out the upper bolt head, (any V8 is seriously difficult to access) * Remove the mount * Extract the threaded stubs * Replace the engine mount * Replace the destroyed cap screws with NEW This repair could have been avoided by replacing six damaged fasteners.. Here is a short list of some vehicles using these mount bolts. W123 280TE W123.000 M110.000 200, 230, 230E W123.023 M115.954 280E W123.033 M110.984 230C, 230CE, 280CE W123.053 M110.984 200D, 220D, 240D W123.123 OM616.912 I4 300D W123.130 OM617.912 I5 300D-T W123.133 OM617.952 I5 300CD Coupe W123.150 OM617.912 300CD W123.153 OM617.952 OM617.912 300TD W123.190 OM617.912 300TD W123.193 OM617.952 OM617.912 230E W123.223 M102.I4 200T, 230TE, W123.283 M102.000 W126 280SE W126.000 300SE W126.024 M103.981 I6 300SEL W126.025 M103.981 I6 380SE W126.032 M116.961/963 V8 380SEL W126.033 M116.961/963 V8 420SEL W126.035 M116.965 V8 500SEL W126.037 M116.963 V8 560SEL W126.039 M117.968 V8 380SEC cpe W126.043 M116.963 V8 500SEC cpe W126.044 M117.963 V8 560SEC cpe W126.045 M117.968 V8 300SD W126.120 OM617.951 I5 300SDL W126.125 OM603.961 I6 350SD W126.134 OM603.970 I6 Last edited by whunter; 02-20-2009 at 02:22 AM. |
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Routine service, yes
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Yes, this is routine service, because so many damaged cap screws are used again, any service garage loves this work = $$$.$$ in their account. It is penny wise and dollar foolish, when the repair could have been avoided by replacing damaged fasteners before installing the new mount.. |
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In my world, any damaged bolt gets replaced.
Did a head gasket when I was in high school, and reused the bolts because the dealer wanted 5 bucks apiece for them!!! First one to get torqued broke. Thankfully, there was enough left to get ahold of with a vice-grip when I removed the head again, but didn't have to be that way. Lesson learned, and the guy at the parts counter was laughing when I came back for the bolts I had just refused 3 hours before. Best time to replace something that is worn out, is when it's already removed. One easy out for a rounded out allen head is to weld a bolt right onto the end of it so you can get a wrench on it. |
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Quote:
Second, the original post I read as being rather alarmist, as if the concern was similar to that of reusing stretched head bolts. I asked why, because with my recent experience I couldn't see any cause for such concern. Now I understand. Third, I'm quite experienced with fasteners as both a former mechanic and a current mechanical engineer. I wouldn't reuse any component that I deemed to be damaged in way that would meaningfully affect its serviceability. But that doesn't mean that I discard every fastener simply because it might be a little beat up. It's always a judgement call, and I feel quite comfortable with my ability to make the judgement for myself. The original post made me think there was more to the story than there is. Thanks for the clarification.
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1987 W201 190D |
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