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#1
12-19-2009, 08:49 PM
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To replace....or NOT to replace (mount bolt)
So...here I am again R&R the motor mounts (not replacing this time though) and I'm just wondering if the main center M10 bolt should be cleaned up and re-used...or would it be prudent to replace the bolt with a fresh one? (Concerned maybe this bolt is getting worn out and is in a high-stress application)
The current ones *look* fine - hex head not stripped at all, etc. Also noticed that these center bolts are sorta weird. They seem to have a sort of built-on washer at the head. If I went *aftermarket* with this bolt, would be just be okay to use a standard M10 bolt (matching hardness) and put a couple washers on there to match the thickness of the 'built-on' one...or should I stick with a MBZ bolt in this case?
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Chris 1985 300SD - 'Grace' (198K mi.) 2018 Honda Civic Sport 2018 Honda CRV LX 2010 Honda Fit Sport (RIP) 2013 Honda Accord Sport (Sold) 1996 Lexus LS400 (Retired) 1995 Ford Contour SE (Retired) 1976 Porsche 914 (Sold) 1972 Datsun 240Z (RIP) Last edited by ck42; 12-19-2009 at 10:29 PM. 
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#2
12-19-2009, 11:02 PM
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I have not read of any reason not to reuse the "Washer Head" Blots (I reused mine).
I have read of them breaking during removal but do not recall reading of one just breaking by itself. If you are worried about over tightening it if the FSM has a torque for it use that. Maybe someone will supply that torque for you.
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84 300D, 82 Volvo 244Gl Diesel
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#3
12-19-2009, 11:27 PM
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I had one break while tightening it after I had replaced the mounts. http://www.peachparts.com/shopforum/showthread.php?t=266793 It was kind of a puzzle to remove the stranded piece of bolt. After that I replaced both ... got them from the dealer and they weren't outrageously expensive.
While mine did break, I don't think one is likely to break on its own, although I'm not an expert in physics. My bolt broke under extreme torsional force (I idiotically WAY overtorqued it) ... that type of force wouldn't be reproduced by the engine or movement of the car. The correct torque is 75nm. Don't go over that ... read my thread. 
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1987 300D, arctic white/palomino--314,000 miles 1978 240D 4-speed, Euro Delivery, light ivory/bamboo--370,000 miles 2005 Jeep Liberty CRD Limited, light khaki/slate--140,000 miles 2018 Chevy Cruze diesel, 6-speed manual, satin steel metallic/kalahari--19,000 miles 1982 Peugeot 505 diesel, 4-speed manual, blue/blue, 130,000 miles 1995 S320, black/parchment--34,000 miles (Dad's car)
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#4
12-20-2009, 12:41 PM
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For as often I wish to replace the engine mounts, I would go for the MB bolts. Hardness, size, etc will be factory orginal and you will save the agg.
BTW, Big Time cudu's to your attention to the hood & frt of your car. That finish is factory. Fantastic for a '85. Gary
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Gary Experience is something you get, Just after you needed it.... '99 E300 295K, '83 300D 220K, '75 240D 185K sold '80 MCI Bus Conv DD 6V92TA, w/4 cyl. Kubota diesel GenSet 12.5KW
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