Forkin’ seals...

Fast Eddie

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So, my brand new fork seals with brand new stanchions are leaking. They only started leaking after I upgraded the front brake, so I guess it’s at least a sign that the brake is good!

Are there any brands of seal that actually work and last? Any to avoid? Any proven mods in this area?

And as daft as it sounds, is any particular brand / type of fork oil more or less prone to leaking out passed the seals?

I hate fork seals. It’s such a big job to fix such a small / cheap thing. I only want to fix it once !
 

Fast Eddie

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Standard issue 1980, so the softer, so called ‘leak proof’ I guess.

But I’ve no idea who made them etc. Hence the request for a known and proven brand or supplier etc...
 
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Ariete fork seals have a good reputation and are double lipped not single lipped as the Norton OEM, but they need reducing on the OD and the ones used on Nortons are for 35mm stanchions not 34.5mm. Have a set but never had to fit them.
 

Fast Eddie

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I was kinda hoping for a recommendation for seals that would fit without re-engineering if possible...
 

L.A.B.

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Standard issue 1980, so the softer, so called ‘leak proof’ I guess.
Your 1980 model should have the 'circlip' forks, so were the 'loose' retainers and circlips fitted?

Leak Proofs seem to work for some forks but not for others although I suspect they are not always genuine Leak Proof.
https://leakproofforkseals.com/

An alternative is to use conventional seals such as genuine Ariete.
https://www.thunderbirdspares.com/f...ers-97-4001-ariete-superior-quality-939-p.asp
 

Fast Eddie

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Thanks all, Ariete seem worth a try.

Now... similar question regarding gaiters... I stopped using gaiters cos I got fed up with them splitting. But I’m considering using them again, recommendations on gaiters that last ?
 
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I can't understand why the rubber parts supplied for Brit bikes are so shit. I've had gearchange & kickstart rubbers fail the first time I've used them, & gaiters don't seem to last long either.
Years ago I worked in the tool room of a rubber mouldings company & the compounds are available to ensure long life parts. Maybe it's because they are made in India.
Check out the Ariete website as I know they list fork gaiters.
 

lazyeye6

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This may not apply, ..........but somewhat recently I installed new fork seals in my Norton Commando. They leaked badly.
When I tore the forks apart, I discovered I had installed them upside down. I installed new fork seals correctly and they
haven't leaked a drop since. I didn't get any special leakproof types that some vendors sell.
 

L.A.B.

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https://www.ebay.co.uk/itm/TRIUMPH-...-SEAL-PAIR-97-7079P-AFTERMARKET-/261379975419

"A PAIR OF AFTERMARKET LONGLIFE TYPE FORK OIL SEALS -- BEWARE OF IMITATIONS.
FOR TRIUMPH T140 BONNEVILLE, TIGER TR7 1973-82 T150, TR6, TR5T & T120 1971-74 AND T160 1975/6.
THESE SEALS SHOULD ALSO FIT BSA & OTHER TRIUMPH MODELS FROM 1971 ONWARDS. A50 A65, A65FS, A70, B25T, B50, T120 TR6 WITH THE CORRECT ADAPTOR RETAINING RINGS
THESE PARTICULAR SEALS ARE NOT OF U.S. MANUFACTURE BUT OF SOME OTHER ORIGIN. DO NOT BE MISLEAD BY INFERIOR IMITATIONS.
CHECK OUT OUR OTHER LISTING OF THE ORIGINAL PART IMPORTED BY OURSELVES DIRECTLY FROM THE MANUFACTURER IN THE USA
EMBOSSED WITH MANUFACTURERS NUMBER SDA S74A THESE ARE NOT GENUINE.
TRIUMPH PART NUMBER IS 97-7079
PLEASE BE AWARE THAT IF THESE SEALS HAVE NOT BEEN FITTED TO EARLIER MODELS PREVIOUSLY THEN YOU MAY REQUIRE ADDITIONAL RETAINER PARTS TO KEEP IN PLACE."



https://www.ebay.co.uk/itm/TRIUMPH-...471807?hash=item4619f92fbf:g:U20AAOSwu3db2bAa

"A PAIR OF ORIGINAL USA MADE LONGLIFE FORK OIL SEALS -- BEWARE OF IMITATIONS.

SUITABLE FOR TRIUMPH T140 BONNEVILLE, TIGER TR7 1973-82 T150, TR6, TR5T & T120 1971-74 AND T160 1975/6. ORIGINAL FACTORY FITMENT TO T140 MODELS 1980 ONWARDS*.
THESE SEALS WILL ALSO FIT BSA & OTHER TRIUMPH MODELS FROM 1971 ONWARDS. A50 A65, A65FS, A70, B25T, B50, T120 TR6 WITH THE CORRECT ADAPTOR RETAINING RINGS
THESE ARE ORIGINAL SEALS OF U.S. MANUFACTURE NOT CHINESE OR INDIAN. DO NOT BE MISLEAD BY INFERIOR IMITATIONS. IMPORTED BY OURSELVES DIRECTLY FROM THE MANUFACTURER IN THE USA
EMBOSSED WITH MANUFACTURERS NUMBER CG1 72-16 - HAVING THE ORIGINAL FACTORY DRAWINGS WE CAN VERIFY THIS INFORMATION. UNLESS THE SEALS HAVE THIS MANUFACTURERS CODE, THEY ARE NOT GENUINE.
TRIUMPH PART NUMBER IS 97-7079
PLEASE BE AWARE THAT IF THESE SEALS HAVE NOT BEEN FITTED TO EARLIER MODELS PREVIOUSLY THEN YOU MAY REQUIRE ADDITIONAL RETAINER PARTS TO KEEP IN PLACE."

*(1978 onwards under part number 97-7010 for '78-'79 as the seal and retainer were not available separately)
 
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They are for Triumph T120/140/150/160 disc type sliders & may also fit the earlier drum brake aluminium sliders. I have these in my TR7 & recently sold OIF T160. I have also fitted this make to a couple of T160s, Hinckley Triumph, Honda RC30, Ducati 888 to name a few. They are top quality & don't seem to give problems.
 

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