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Old 01-21-2020, 08:42 AM   #1
Mkuczyra
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Default 35mm fork seal question

I searched though a bunch of rebuild threads but I can’t seem to find one with the answer for this. I’m rebuilding a 35mm front end off a 79 FXS showa lowers. After I pulled the snap ring and the fork seal there was another seal sitting in the lower. I don’t see this seal in the service manual and it doesn’t seem like it comes in any rebuild kit. It’s about an 1/8 in thick. I’m gonna attach something pictures and hopefully someone can help me figure it out.
Thanks
Mark
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Old 01-21-2020, 07:26 PM   #2
govmule84
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Default Re: 35mm fork seal question

I've pulled that same seal out of some forks.

After doing what you did (not finding the fucking thing in a diagram in a parts manual) the first time, I put it together like the manual said.

Never had a problem out of any one I did like that. YMMV.
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Old 01-22-2020, 09:14 AM   #3
joe49
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Default Re: 35mm fork seal question

I've never found one like that in the small forks, but was common add on in the big forks. As was stacking the short seals.
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Old 01-22-2020, 06:32 PM   #4
alongrider
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Default Re: 35mm fork seal question

The double seal is an old trick from back in the day. Not sure exactly but I know I first heard of it, and started running'em, in the early 70's. Runnin just the one seal and the felt wiper tended to leak so we found that stacking 2 of the seals and leaving the wiper out would solve the problem.
I doubt you are gonna find it in any manual but an early copy of "Easyriders" magazine from that time had like a tech tip showing how to install the trick.
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Old 01-22-2020, 08:59 PM   #5
MikeJustice55
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Default

The smaller seal acts as a buffer to lessen the strain on the outer seal. We do that on hydraulic cylinders on machines as well to reduce the chance of blowing a seal or getting any leaks. You should be able to put a new seal in and secure it with the snap ring and be good to go.
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