Leak proof fork seal which side up?

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Hi All,

Can someone help with this?

Does the solid side face up or down? The instruction I got with the seals were unclear.

Thanks,
 
The flat side sould face upward.
As a general rule oil seals should be fitted with the lip ( the part where the spring is fitted) towards where the oil is.
 
Peter R said:
As a general rule oil seals should be fitted with the lip ( the part where the spring is fitted) towards where the oil is.

However, 'Leak Proof' seals don't have the lip or the spring, nevertheless the flat side still faces upwards, away from the oil.
Leak proof fork seal which side up?
 
Wierd thing is they need to "float " up and down freely in the bore. Just a tad. Mine have never leaked a drop. Filed a few (4) notches in top of the bushing to acomodate oil travels and movement for them. No washers , circlip or paper gasket required. Oil seal and push in gently by hand only.
 
Makes me smile when i see the discription "leak proof" surly all seals should be "leak proof"? and "stay up floats" compared to what?
Never been in a shop for wellie's and the the guy asked " which sort would sir require...waterproof ones ? :lol: Nar....give me the ones that leak!!
 
Leak proof seals, any seals will leak when they get old and hard or any damage even the leak proof ones, I did use them once and found they failed quicker than nomal fork seals, but since putting gaiters on my forks I haven't had any problems with leaking fork seals.

Ashley
 
I put some kind of Honda seals in my forks back in the 70's and they still work. I wish I could remember what Honda they came from in case I never need them again. Does anybody remember? I think it was a common mod back in the day.
Jaydee
 
Original seals on the left (see the paper washer), Honda parts on the right.

The Honda seals need to have the outside diameter rubber coating turned down just a bit.
While you are into the forks, check/replace the red fiber washer way down in the bottom of the slider.

Leak proof fork seal which side up?
 
The Honda seals have 2 lips, one acts as the oil seal the second as a dust seal, Triumph and BSA fork seals also tend to be this type. Why Norton used single lipped seals is a mystery, maybe less stiction.
 
john robert bould said:
Makes me smile when i see the discription "leak proof" surly all seals should be "leak proof"? and "stay up floats" compared to what?
Never been in a shop for wellie's and the the guy asked " which sort would sir require...waterproof ones ? :lol: Nar....give me the ones that leak!!

You make me laugh! Like "New and Improved"; how could it be improved if it's new?
 
Never found any stiction issues with them ...maybe the extra oil pathways slots I cut into top of the bushes helped. They are designed to move a wee bit up or down in the holder fork leg bores with the compression or relaxations of fork travels. I use Synthetic fork oil now.
 
jseng1 said:
The leak proof fork seals add too much sticktion.

That's been my experience too, even with the bushes slotted to promote oiling.

Still running them though.
 
I think it was Lucas Synthetic 15W fork oil. 2 years back now , not a drop leaked so far and no stiction issues. These are good seals if left to move on their own.
 
More often is the wear in the slider ,ie dragging on the "Iron" lower bush that gives the feel of sticking. i have now got all the equipment to ream out the sliders and fit .005 thou oversize bushs in PEEK ..just completed a pair of Seeley forks..must admit they feel good..
Again i repeat...when the sliders wear the lower bush gets trapped in the slider on braking..after 40 years the forks do wear..i have seen 5-8 thou common. You know the score.. New bush tight at the top going in, and slack in the centre. :twisted:
 
I last fitted a set of seals provided to me by Bob Nesbit. They were quite soft, with no solid outer and had 2 lips on both ID and OD. They were slightly tricky to fit, but have never leaked. The only problem I found with them was that I ended up with rust spots on my staunchins after a long trip one time and through a small amount of rain. Just goes to show you why the brits designed bikes to leak oil. I run hydraulic oil in both my Commando's.
Dereck
Which reminds me, I have to make up a decent funnel for replacing the oil next time. Could be made using an oil top nut.
 
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