| ausmini https://www.ausmini.com/forums/ |
|
| Selector fork wear https://www.ausmini.com/forums/viewtopic.php?f=2&t=64081 |
Page 1 of 1 |
| Author: | harry33 [ Wed Jun 30, 2010 12:00 pm ] |
| Post subject: | Selector fork wear |
Hi all, I'm at the stage of figuring out which bits of my gearbox need to be replaced. The 1st/2nd selector fork has about 0.025" side clearance, and 3rd/4th has about 0.05". I assume 3rd/4th needs to be replaced, but would I be able to reuse 1st/2nd? Cheers, Harry |
|
| Author: | GT mowog [ Wed Jun 30, 2010 4:17 pm ] |
| Post subject: | |
They are both cactus. Maximum clearance is 0.015" |
|
| Author: | harry33 [ Wed Jun 30, 2010 5:36 pm ] |
| Post subject: | |
Ok, I'll add them to the shopping list.. One more thing, is there a trick to removing the pivot post that the bellcrank levers sit on? I'd like to renew the seal there, but I haven't been able to drift the post from the case (which is what the manual suggests). Cheers, Harry |
|
| Author: | GT mowog [ Wed Jun 30, 2010 6:00 pm ] |
| Post subject: | |
harry33 wrote: Ok, I'll add them to the shopping list..
One more thing, is there a trick to removing the pivot post that the bellcrank levers sit on? I'd like to renew the seal there, but I haven't been able to drift the post from the case (which is what the manual suggests). Cheers, Harry These don't normally give trouble so I usually leave them, but if you have disturbed it best to keep going with it. I have a support that I put under the gearcase that is a lttle larger in diameter than the pivot boss (underside) and I press them out. The gearcases are only alloy so I feel it not a good idea to go banging stuff around in them. |
|
| Author: | drmini in aust [ Wed Jun 30, 2010 7:02 pm ] |
| Post subject: | |
GT mowog wrote: They are both cactus. Maximum clearance is 0.015"
They had .015" clearance when NEW, I'd say a bit more is OK. IMO if over .030", find new or better ones. Yes we know they are expensive now. 
[edit] The Poms being cheapskates often squeeze them in a vice to close them up, I don't like to do this as they are a casting (brittle). |
|
| Author: | GT mowog [ Wed Jun 30, 2010 7:10 pm ] |
| Post subject: | |
drmini in aust wrote: They had .015" clearance when NEW Sorry here but I beg to differ, I have found them NEW to be around the 0.005 - 0.006"........but then that is on a Rod Shift
Oh and I only use genuine ones............ |
|
| Author: | drmini in aust [ Wed Jun 30, 2010 7:10 pm ] |
| Post subject: | |
GT mowog wrote: drmini in aust wrote: They had .015" clearance when NEW Sorry here but I beg to differ, I have found them NEw to be around the 0.005 - 0.006"........ Well I did find that figure in a BMC factory book somewhere. 
|
|
| Author: | GT mowog [ Wed Jun 30, 2010 7:13 pm ] |
| Post subject: | |
drmini in aust wrote: Well I did find that figure in a BMC factory book somewhere. Page f6 of the Black Book
|
|
| Author: | drmini in aust [ Wed Jun 30, 2010 7:17 pm ] |
| Post subject: | |
I successfully built a pair or remote forks up 15 years ago with SBA245 silver solder, and machined them to fit. I rebuilt the GT box (ex Chris Buckingham) for my boss along with the motor (now 1330) but it's still sitting on a pallet at work!!:mrgreen: I'm sure they will work OK, silver has a low friction coefficient and this stuff won't melt until 610°C. |
|
| Author: | GT mowog [ Wed Jun 30, 2010 7:23 pm ] |
| Post subject: | |
drmini in aust wrote: I successfully built a pair or remote forks up 15 years ago with SBA245 silver solder, and machined them to fit.
I rebuilt the GT box (ex Chris Buckingham) for my boss along with the motor (now 1330) but it's still sitting on a pallet at work!!:mrgreen: I'm sure they will work OK, silver has a low friction coefficient and this stuff won't melt until 610°C. I've often looked at doing something similar, especally on 1st / 2nd fork. The thrust area on these is pittiful. No wonder they wear so quick. |
|
| Page 1 of 1 | All times are UTC + 10 hours |
| Powered by phpBB® Forum Software © phpBB Group http://www.phpbb.com/ |
|