The BSA A7-A10 Forum
Technical (Descriptive Topic Titles - Stay on Topic) => Frame => Topic started by: Martin on 06.11. 2020 19:00
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Hi, i have bough new hard chromed stanchion and now I am wandering how to get upper bush into the slider. I need to get it as deep as is needed to fix it by C ring. Do i need some special tools for it? I have tried to do that by hand only to avoid any demages but it does not work. Also do you recommend some other tools which will be needed later? Stanchion puller, tool for oil seal holder,.... thank you very much. Martin
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Hi Martin,
You need to fit the seal holder to the fork leg from the bottom before fitting the bushes
There are quite a few long topics on here on fork rebuilding so worth a search
Also read the relevant service sheets
The top bush should just push down into place,
It is worth test fitting the top bush and circlip and checking if any shims are needed between them before doing the final assembly
John
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Hi Martin
To simplify fork leg assembly by getting rid of the need to shim and fit the circlip, try the seal retaining ring/cup off the later A65
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The picture shows the bottom nut will not pass through the top bush. The bare stanchion is assembled, starting from the top, with holder, (oilseal installed, open side faces down)), C Clip, shims as required (or later collapsible spacer), then top bush, bottom bush, washer and nut.This sub assembly is then loaded into the leg. Clip holds the top bush in place. Start by positioning the top bush in the slider and check for any gap between the top of the bush and the underside of the clip. Select shims as required.
If the bushes are new, pattern parts, the OD may be just a little larger for your sliders. As CJ mentions, the bush is just a push in fit. The oilseal holders, again if new, may require some attention to their threads, some sources are not to good getting this thread right. Try each individual part first for fit.
The oilseal holder tool is a simple tube with a couple of tangs to engage in the slots in the holder, and is certainly needed for dismantling. You can make something to do the job. Reassemble tightening can be done with a firm grip using among other tricks rubber gloves, that non slip stuff that goes under rugs or a well protected fabric strap wrench, all to prevent scratching your new chrome. Backyard stanchion puller for a "one off" is a broom handle, for more serious use a cut down old top nut with a length of threaded bar, and finally the official tool.
Billy's suggestion saves a lot of messing about if the clips need a shim underneath to keep the bush in place. Any gap between bush and clip allows the bush to float up and down in the slider...not good.
Swarfy.
Additonal. Thanks to RogerS for posting the link below.
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Here you are Martin. Overhauled my A10's forks 18 months ago, it's covered here:-
https://www.a7a10.net/forum/index.php?topic=14235.msg118136#msg118136
I found an easy way to fit the circlips but in the end I decided to try the A65 retaining cups, the circumference of them was slightly too big (badly manufactured) and I had to file them to fit. They work fine.
(Edit) Info on oil seal holders and thread problems in post 25. Also shimming the top bush post 30.
Cheers, Roger.