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Author Topic: Front seals keep leaking  (Read 208 times)
Dash
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« on: October 03, 2017, 03:08:07 AM »

Im having issues with the seals in my front suspension: they start leaking every time. Ive already changed them twice now to no avail. I then replaced the front fork uppers with new ones thinking that the small dents / scratches on the uppers may have been the cause of the leakage. Apperantly they were not: with new uppers the fork seals still keep leaking.

Im kind of at a loss here. The uppers are nice and smooth, there s no denting or whatever in the suspension travel. The seals are installed properly. Could it be the lowers perhaps? Huh
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a_morti
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« Reply #1 on: October 03, 2017, 03:20:52 AM »

Have you replaced the bushes yet? As they wear, you can get more play in the suspension which will put undue stress on the seals.

Also be sure you're not over filling the oil as this will stress the seals.
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Cam Drive Gear Train Smiley
a_morti
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« Reply #2 on: October 03, 2017, 04:29:11 AM »

And try allballs seals, they are triple lip and do a bit better. Won't fix an underlying issue though.

I guess the fork lowers could wear with enough miles especially if the oil wasn't refreshed regularly enough and if the bushes were worn. Don't think I've ever seen it though
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Cam Drive Gear Train Smiley
Dash
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« Reply #3 on: October 03, 2017, 05:06:57 AM »

Have you replaced the bushes yet? As they wear, you can get more play in the suspension which will put undue stress on the seals.

Also be sure you're not over filling the oil as this will stress the seals.

I dont think the bushes have ever been replaced.

Also, overfilling isnt an issue I daresay. Always kept to the prescribed amounts.
« Last Edit: October 03, 2017, 05:10:23 AM by Dash » Logged
Pod70
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« Reply #4 on: October 03, 2017, 08:59:16 AM »

As Aaron says try the All Balls or Athena seals, a lot of the cheaper seals on Ebay and some of the general suppliers are rubbish. Worth checking the bushes, if there are any copper coloured areas on the bushes, then they are worn and should be replaced
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spacetiger
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« Reply #5 on: October 03, 2017, 07:15:41 PM »

Also be sure you're not over filling the oil as this will stress the seals.

+1 on the oil level.  If it is too high (even the stock level) when the fork compresses, it really drives up the pressure in the fork.  At the factory oil level, it is way above the seals.  So, with [very] high pressures, it can push oil past the seals even if they are new.  Next time you check out the oil level (spring out, fork tube compressed), note how high the oil level is above the damper rod, or how high it is above the seals.  You'll be very surprised.

Jerry
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Dash
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« Reply #6 on: October 04, 2017, 05:10:44 AM »

Thanks guys. Gonna take your tips to heart when I get to disassambling the lot.
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