Leakproof Fork Seals
 

I have a small leak on my 600SS forks - AGAIN. I can't understand this. Every year, just before the MOT, the right-hand leg weeps oil. Dealer fixed it once, since then I have fixed it twice. No signs of chips or marks on the slider.

Im thinking of trying "leakproof" seals - anyone had any experience of them?

The seals on the wifes 750 Monster are just the same.I changed them about a year ago and noticed the r/h side leg is leaking again.She has only done about 1500 miles since last year.I think the problem is with the Marzzochi forks,I heard that the seals that were origionally fitted were the wrong size!I have bought a new set of seals and will fit them this weekend.Hopefully they will last a bit longer.:lol:
BTW,Some bikes were fitted with Paoli forks,which were a lot better.

I thought the seals were a bit too easy to fit over the slider - they seem very loose. Maybe they are the wrong size!

I've found a source of the leakproof moly seals in the UK and I'm going to try them.

The leakproof ones are just double lipped seals. If you but a any decent set of aftermarket seals they should be fine.

Should have 2 lipps and a proper spring in them.

Kev

I dont believe it.
 

The new seals have lasted a month!:mad:
When Maria pulled into the drive after the GP,I noticed some oil on the front of the bike.The L/H seal had completely blown and oil was dripping out of the dust seal.The R/H was weeping and looks like it may do the same soon.
AAAAAAAAAAAAAARGH!!!

must be something wrong with the forks then, The tubes are ok no scratches or chips.

Are you overfilling it with oil.

Must be a reason why, just need to find it out.

Update of fork seals
 

OK. Got some pro-moly seals from Motohaus marketing (good service). The new seals are the same size as the oem seals but require you to use an additional washer on top of the seal and instructions say there must be 0.5mm float. Well, there would be NO float even without the additional washer. After looking at things closely, I removed the thick oem washer and relaced in with one supplied in the kit (much thinner). Then on went the seal, then the other (thin) washer supplied in the kit. This left about 0.5mm float. Re-assembling the forks I noticed that the stanctions were a very tight fit through the new seal (so much so that I was worried about the forks sticking down). Now all re-assembled it seems to work fine. I'll report back in a while - but I wont be able to do many miles yet as my regulator has just gone! Damn damn damn! It's just one thing after another.

[Edited on 20-7-2003 by Graham M]

One thing after another?
 

Stick with it Graham, it'll be worth it in the long run mate! :roll:

:ninja:

More seal woes
 

Well, I don't believe it! I haven't used the bike for a while as I was waiting for the regulator. Fitted that last night and wheeled the bike out tonight in preparation for tomorrows MOT - AND THE FORK LEG HAS FLUID ON IT! Despite my checking the fork leg there HAS to be a fault with it.

I seem to vagely remember an American company (Bel-ray ???) used to sell fork oil that contained a component to make fork seal "swell" and seal correctly.

Just thought I'd throw that in.

Is it possible that there has been some wear on the slider somewhere so that the tube is not completely circular and true? Or that there is internal wear that allows the slider to move forward and back slightly???????????????????

Good luck - Frank

Latest info
 

Well, this is strange. I took the bike for MOT today (wiped the oil off the stanctions up the road from the MOT centre and crossed my fingers). Got thru MOT ok.

Went for a ride and NO OIL LEAK!

This is strange.

I had a good look at the forks when I had them to bits and there is no obvious damage, but I guess there must be somewhere.

I'm gonna take the forks to a dealer and have them checked.

If they are u/s I guess I'll be in the market for a pair of second hand 750SS forks (dual disk).

Any advice?:(

It may be that some of the fork oil has crept inbetween the seal and the dust seal when you re-assembled the forks.I had exactly the same happen to me when I changed them on the wife's Monster.I went for a little test ride and spotted oil weeping down the slider.Stopped and wiped it off,then carried on.It never leaked again.

Looks like it is sorted
 

Seems it's sorted - you may be right keefyboy.

Just in case I took BOTH forks to bits on Sunday (between WSB on telly) and changed the oil for 10W and slightly lower level. I noticed that the oil in the "old leg" (the one that never leaks) was dark red and VERY thick compared to the 7.5W silkolene I had been using. Anyway - all reassembled, all oil tight. For now.