Board logo

OT Motorbike Fork Oil Seals
whitestu - 14/4/09 at 10:33 AM

I'm trying to change the oil seals on my FZX750 and can't get the buggers out!

I've got forks fully apart [top nut, spring and damper rod all out] but can't get the two tubes to seperate.

I've already tried giving it loads of welly pulling the two apart and it won't budge.

Any suggestions?

Thanks

Stu


Triton - 14/4/09 at 10:38 AM

Is there anything underneath where spindle runs...like a big allen bolt?


handyandy - 14/4/09 at 10:42 AM

yep what he said ^^^^^^^.
if there are bolts at bottom of forks, undo em & tubes should seperate then take fork seals out.
andy


whitestu - 14/4/09 at 10:42 AM

quote:

Is there anything underneath where spindle runs...like a big allen bolt?



The allen bolt holds the damper rod in, but that's already been removed.


handyandy - 14/4/09 at 10:45 AM

in that case maybe there is a circlip hiding underneath the fork seals that stop the upper tubes being removed, have you prised the seal or dust cover away from where they sit on the fork? sorry not had same bike as you.
hth
andy


Triton - 14/4/09 at 10:48 AM

Yep big circlip under the seal and bingo they will come apart, Been awhile since i did owt like that but easy really.


whitestu - 14/4/09 at 10:48 AM

quote:

in that case maybe there is a circlip hiding underneath the fork seals that stop the upper tubes being removed, have you prised the seal or dust cover away from where they sit on the fork?



Thanks

Should have said the circlip and dust cover are also off - there doesn't appear to be anything to stop the forks coming apart other than the seal.

Stu


handyandy - 14/4/09 at 10:54 AM

Hmmmm the seals should prise away from the tube with a helpful screwdriver
can,t think of anything else to hold them in???
andy


MikeCapon - 14/4/09 at 11:02 AM

Hold the fork leg in a vice and providing you've removed the plunger (bit held in to fork leg with allen bolt) and the wire circlip (under the dust seal) you then need to use the fork tube a bit like a slide hammer. This will then gradually knock out the seal and the bush which lives in the top of the fork leg.

This won't work just by pulling on the fork tube. You need to use the inertia of the tube to knock out the seal and the bush.

Have fun!

Mike


NigeEss - 14/4/09 at 11:02 AM

Some times the top guide bush comes out at the same time and these can be tight.
Clamp the lower leg in a vice by the caliper mounts and use the top leg as a slide
hammer. A few good pulls and they should budge.
HTH
Nige


whitestu - 14/4/09 at 11:06 AM

Thanks

All the bolts / circlips are out.

quote:

you then need to use the fork tube a bit like a slide hammer




That's what I've been doing, until my arms ache and everything has fallen off the shelves above my bench! And it hasn't moved at all.

Stu


Mr Whippy - 14/4/09 at 11:25 AM

quote:
Originally posted by whitestu
Thanks

All the bolts / circlips are out.

quote:

you then need to use the fork tube a bit like a slide hammer




That's what I've been doing, until my arms ache and everything has fallen off the shelves above my bench! And it hasn't moved at all.

Stu


glad thats not my bike


whitestu - 14/4/09 at 11:27 AM

quote:

glad thats not my bike



Thanks!!

I need to get it sorted for the MOT on Friday!


thebull - 14/4/09 at 11:32 AM

fasten lower fork leg in a vice and use the chrome stantion as a slide hammer.


whitestu - 14/4/09 at 11:41 AM

quote:

fasten lower fork leg in a vice and use the chrome stantion as a slide hammer.



Thats what I've been doing!


NigeEss - 14/4/09 at 12:08 PM

Gently heat the area around the seals ?


oily85 - 14/4/09 at 01:56 PM

I had the same problem on one fork of my cb500, turned out the previous owner had siliconed the fork seal in, so had to prize the seal off first with a screwdriver.

Id been using the fork tube like a slide-hammer for so long and so hard, that when it eventually came apart, I also needed new bushes, as they'd been smashing into each other for about 3 hours and one had a step in it about half way down.

The right fork seal, which hadn't been siliconed in, took me three slides of the fork to remove.


whitestu - 14/4/09 at 05:49 PM

I heated it up and it came out a lot easier - both out now so just need to reassemble them.


handyandy - 14/4/09 at 06:56 PM

glad you got it sorted
sounds like it was a bit of a pain in the butt tho
my vfr750 needs the seals doing, your thread,s made me think "must get it done".
cheers
andy


whitestu - 15/4/09 at 08:17 AM

I think it depends on the bike how difficult it is. On mine the top bush is a very tight fit and the bottom bush needs to push the top bush out as well as push out the oil seal.