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Differential bolts
One of the 4 small bolts for securing the diff on my 85' 300TD is buggered. Seems like the nut inside the body is cross threaded. I ran a die over the bolt a few times to help clean it up but it's still not right, too tight as it snuggs up.
I'm guessing that the nut is impossible to get to? I was going to add a lockwasher and use antisieze to reduce the chance of snapping the bolt (M8? what were they thinking?). Any suggestions?
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1985 300TD 1981 Scirocco 1.6D conv 1986 Golf 1.6D 2003 Golf TDI |
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I am wondering if blue locktite or antisieze is the way to go. I worry about corrosion in fasteners (especially these), but it did have locktite before.
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1985 300TD 1981 Scirocco 1.6D conv 1986 Golf 1.6D 2003 Golf TDI Last edited by sgnimj96; 07-26-2015 at 05:44 PM. |
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Blue loctite always with a structural bolt.
Anti seize will cause the bolt to loosen as it is slick. The prior owner of my car put anti seize on my brake caliper bolts, they worked loose and I started getting these weird clicking sounds when I braked. Turned out the caliper was about to fall off the car.
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The OM 642/722.9 powered family Still going strong 2014 ML350 Bluetec (wife's DD) 2013 E350 Bluetec (my DD) both my kids cars went to junkyard in 2023 2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles) 2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles) 1998 E300DT sold to TimFreeh 1987 300TD sold to vstech |
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Thanks!
Yea, after reading a bit on it, manual says those (coated) bolts are not to be reused. I replaced all (4) M8 bolts with my new ones with hex heads. Cleaned out all the threads with a tap and used blue locktite. The new bolts that I had on hand look good for the application, same length threads. McMaster-Carr I need new pads on my front calipers so I'll make sure those are clean with locktite as well; I think they are. And I'll be sure to do the rear calipers correctly as I still have to put them back on.
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1985 300TD 1981 Scirocco 1.6D conv 1986 Golf 1.6D 2003 Golf TDI Last edited by sgnimj96; 07-26-2015 at 09:28 PM. |
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The caution in the manual about not reusing bolts is CYA to make sure they are properly thread locked. They don't want to take a chance on someone reinserting the bolt and not applying more thread locker.
For non stretch to yield applications, in my opinion, thoroughly cleaning off the old thread locker, chasing the receiving threads with a tap, and applying fresh blue Loctite is adequate. Now if you have a stretch to yield bolt (like a head bolt) that is a different animal. Brake caliper bolts are definitely not stretch to yield. All that said, I would (and have) replace differential mount bolts on principle. Just because of what it's holding up and the abuse it takes.
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The OM 642/722.9 powered family Still going strong 2014 ML350 Bluetec (wife's DD) 2013 E350 Bluetec (my DD) both my kids cars went to junkyard in 2023 2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles) 2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles) 1998 E300DT sold to TimFreeh 1987 300TD sold to vstech |
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