I remove my rear brake caliper to replace the brake pads. Both bolts were very difficult to remove and when I inspected one, there was a grey material on the bolt thread itself. So the mounting bracket thread was partially stripped and wanted to know if I should trust an epoxy thread repair kit to fix this problem. The torque rating for this bolt is 24Nm and the thread repair kit torque spec exceeds the recommended torque rating. I'm just not sure either way if the epoxy route is safe or not giving the caliper will go through many heat cycles. Could someone also confirm the bolt size - i think it's M8x1.25?
Standard tech question.... what year and model of Monster?
Quote from: Speeddog on April 15, 2012, 04:34:10 PM
Standard tech question.... what year and model of Monster?
Sorry, 94 M900.
Do it right and helicoil it.
You can get the kit at any auto parts store.
Quote from: transplant on April 15, 2012, 06:38:03 PM
Do it right and helicoil it.
You can get the kit at any auto parts store.
helicoil's for the birds. use a time-sert when ever possible for striped or blown out threads. if you need a brake bracket i actually have one off my old 95 m900 to make you life easier.
Quotehelicoil's for the birds. use a time-sert when ever possible for striped or blown out threads.
+1, FWIW, I've installed a Time-Sert for the pre-screen filter threads on my 2011 696 (still cannot figure out why the threads were damaged and I always use a torque wrench!).
There was another thread where a fellow just installed a Time-Sert for his oil pressure sender, worked well!
A properly sized Time-Sert (you can get them in stainless, by the way) will be STRONGER than stock and ensure you NEVER have to deal with the problem again, which by the way pertains more to the use of steel threads with aluminum, a near recipe for some sort of thread damage over the years...
I ordered from these folks, least expensive I've found...
http://http://www.mechanicstoolsandbits.com/ (http://http://www.mechanicstoolsandbits.com/)
I have heard but cannot confirm that many folks who race install thread inserts on a new bike to prevent this sort of problem, particularly on high maintenance items, I would not be surprised if it were true...
Personally, I would try to chase the threads with a tap before I'd use an epoxy kit or go out and buy a heli-coil / time-sert kit (they're expensive), particularly if the threads don't look completely f'd up. Then I'd put a dab of anti-seize on the bolt, and see if I could torque it to spec without stripping the threads. If I could, I'd call it mission accomplished, and periodically make sure the bolts are still tight.
If the threads really didn't look bad, I'd clean up the bolts, anti-seize them, and see if they'd torque to spec without stripping the threads further. Then when I did totally strip the threads way worse than they were before, I'd curse a lot, hit myself on the forehead, and get on eBay to buy a new bracket :).
It looks like there are several eBay brackets for sale cheaper or roughly the same as a helicoil / timesert kit, or you could take Dub Luv up on his offer and buy his old one. Either way, when you have steel bolts going into aluminum that is subject to high heat / cycling, anti-seize is your best friend.
Quote from: elgallo73 on April 15, 2012, 09:17:57 PM
There was another thread where a fellow just installed a Time-Sert for his oil pressure sender, worked well!
http://http://www.mechanicstoolsandbits.com/ (http://http://www.mechanicstoolsandbits.com/)
Yep, that was me but I at least this time, I didn't cause the problem. [laugh] If the consensus of DMF is no epoxy repair thingy, then so be it.
Dub luv you have PM!