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indybobm
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« on: March 24, 2012, 11:27:45 AM » |
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There have been previous posts asking whether or not to re-use damper plate bolts. My old rear wheel is ruined due to a missong thrust washer so I decided to experiment with it. The factory torque value for these bolts is 14 ftlbs. I started by torqueing the 5 used bolts starting at 5 ftlbs. and increasing by 3 ftlbs each time around. Two of the bolts torqued properly. The other three had a vague feel to them and I was getting concerned that they would break. One of the bolts that made it to 12 ftlbs only required 5 ftlbs to break it loose. I had measured the bolts previously and discovered that it had grown longer by .040. There was also a visible thinning of the threaded section just under the head of the bolt, where the threads begin
What this tells me is that these are torgue-to-yield bolts that should not be re-used. If they are re-used and do not break when tightened, they are not really as tight as you think they are and could stretch and loosen over time.
Being that this is the damper plate, there is not a lot of stress on it, but what about the brake rotor bolts? Honda says not to re-use them either. At least, they are accessible after the wheel is back on the bike. The rotor bolt is a bigger bolt but they could be torque-to-yeiald bolts also and the above problems could apply to them also.
Would do you think?
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« Last Edit: March 24, 2012, 11:43:21 AM by indybobm »
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So many roads, so little time
VRCC # 5258
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RP#62
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« Reply #1 on: March 24, 2012, 01:14:30 PM » |
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Its been a long time since I've had my damper plate screws out, but it seems to me that they're only subject to shear loads, not tension loads, so theoretically, they only need to be in tight enough to not vibrate out. I've always reused mine both on the damper plate and on the brake rotors.
-RP
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wild6
Member
Posts: 251
(Old enough to know better)
Vernon, NJ
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« Reply #2 on: March 24, 2012, 03:33:28 PM » |
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I agree. The damper plate bolts only hold the plate from rotating (shear force) and the plate isn't even being stressed in that direction when the wheel is being driven. The flange pins push on the dampers, not the plate.
On the other hand, the disk rotors are transferring all their (anti) torque through their retaining bolts to the wheel. It's those bolts I'd have reservations about re-using.
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  “Meddle not in the affairs of the Dragon, for you are crunchy and taste good with ketchup.” |
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Jeff K
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« Reply #3 on: March 24, 2012, 05:48:57 PM » |
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A dot of blue loctite and put em back in. Thats what I do.
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Mr Steve
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« Reply #4 on: July 25, 2012, 09:59:08 PM » |
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Just an FYI on reusing these bolts, once used they cannot take 14 lbs torque. I just snapped one off in a new rim  Should have bought new ones. Now it looks like drill and hellicoil. Good thing it wasn't a rotor bolt and is only an issue with shear. |
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Jeff K
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« Reply #5 on: July 25, 2012, 10:31:16 PM » |
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Mine have been in and out of my wheel at least 6 times. No problem.
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« Last Edit: July 26, 2012, 05:41:02 AM by Jeff K »
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dreamchaser
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« Reply #6 on: July 25, 2012, 10:38:19 PM » |
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I agree with you, Indybobm. I recommend that any time a bolt shows signs of measurable stretch, or "feels" like it is not giving a firm reading on the torque wrench, that the entire group of bolts in question should be replaced with the propper grade of new bolt.
Come on guys, we are talking reletively inexpensive fasteners performing an important function and it should not matter which stress factor is coming into play.... there is a torque value called out, therefore, it is to be respected as important. If this were not the case the manual would just say "snug".
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9Ball
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« Reply #7 on: July 26, 2012, 05:01:29 AM » |
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I'm with Dreamchaser on this one...always have been. For me, it's very little money but well spent.
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VRCC #6897, Joined May, 2000
1999 Standard
2007 Rocket 3
2005 VTX 1300S
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jer0177
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Posts: 556
VRCC 32975
Pittsburgh, PA
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« Reply #8 on: July 26, 2012, 07:44:07 AM » |
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Just an FYI on reusing these bolts, once used they cannot take 14 lbs torque. I just snapped one off in a new rim Should have bought new ones. Now it looks like drill and hellicoil. Good thing it wasn't a rotor bolt and is only an issue with shear. try using a left handed drill bit (actually available at autozone) before you go all heli-coil on it. |
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