fork seals. going to do them myself (UPDATE AND QUESTIONS)

befdelta7 · Brolly Dolly Joined: 24 Aug 2006 Karma :

hi,
one quick question, my forks seals on my cagiva supercity 125 'went' a few months ago now the mot's due im in need of some answers.

the seals leaked all the oil out the forks months ago, can a put it in for the mot with the forks as they are? there not leaking but dont dampen as they did before the seals 'went' would this pass the mot do you think?

cheers!!
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Paddy Blake · World Chat Champion Joined: 29 Jun 2006 Karma :

They are not leaking because there is no oil in them.When you put the oil in they will leak again.
I don't know about mot but I would think it's best to put new seals and oil in them.

Paddy.

Blau Zedong · Banned Joined: 26 Jun 2006 Karma :

It'll fail on insufficient damping and you'll fail on mechanical insensitivity!
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befdelta7 · Brolly Dolly Joined: 24 Aug 2006 Karma :

right as the title says, im going to do them my self.
iv got a manual and have had a read through it, i understand the ins and outs of these dam things now!

is it an easy job to do? they are the usd type forks aswell Exclamation

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ms51ves3 · Super Spammer Joined: 08 Jun 2007 Karma :

I've watched a few videos on YouTube as I'm planning on doing mine soon. One guy changed them in 15 minutes.

Clicky

Clicky

Not sure about the method of getting the seal out by using the fork as a slide hammer as my TZR manual says you should just pull them apart.

Hopefully someone will clarify if this is OK as I would like to know too.

befdelta7 · Brolly Dolly Joined: 24 Aug 2006 Karma :

if my understanding is correct all i have to do is:

undo the top fitting on the top of the slider

compress the slider untill the inner rod extends out the slider and exposes the 2 half stopper things

empty the oil from the slider tube by pumping the slider up and down

remove the slider out of the fork leg

remover the dust seal, clamp ring and prize out the oil seal from the fork leg

clean the seal seating area

replace the dust seal and clamp ring onto the slider

place the new oil seal into the fork leg and slide the slider tube into the fork leg

impact the oil seal into its seat with pvc pipe and a mallet

fill up the slider with correct oil giving the slider a few pumps while filling the slider, then retighten the top fitting
JOB DONE Question

anyone feel free to point out anything i have missed, will be very helpful

thank you all Thumbs Up

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Dont do a wheelie in front of a traffic copper... it gets you 3pts and £220 fine.

MarJay · But it's British! Joined: 15 Sep 2003 Karma :

Frost · World Chat Champion Joined: 26 May 2004 Karma :

Some garages might pass them with no oil in, but its probably for the best to get them sorted.

the hardest bit is getting the front of the bike off the ground. Makre sure you loosen all bolts whilst its on the ground to avoid tipping it off the jack or something!

FerretFing · World Chat Champion Joined: 12 Nov 2007 Karma :

at least you`ve saved yourself some time by emptying the oil first Shocked

I made a tool (pic) for holding the damper rod on my Er5 using socket extensions until long enough + using a 8mm socket at the very end.

Thought I`d post it just in case it helps Thumbs Up

Paddy Blake · World Chat Champion Joined: 29 Jun 2006 Karma :

It is best to open the top nut while pushing down on the fork as it is fine tread and can get messed up if you don't.
Second video.

Paddy.

Paddy Blake · World Chat Champion Joined: 29 Jun 2006 Karma :

Can you post a picture of the forks.4.One of each one just over the seals(6 in) and the same from the back of them.Just to see if there is more damage from no oil.

Paddy.

ms51ves3 · Super Spammer Joined: 08 Jun 2007 Karma :

befdelta7 · Brolly Dolly Joined: 24 Aug 2006 Karma :

thanx for the replys lads!

paddy: ill try to get a few pics, if i come across the camera.

i got round to fitting new sprockets and all round brake pads today as the weather was sunny (makes a change) but the chain was too long, by about 4links i think. any ideas how to cut it shorter? was thinking of using the dremel and grinding the the pin then pushing it out with a small drill bit or something. tryed some chain tool thingy, pin didnt even budge!

just waiting on the fork seals to arrive and then i can get going fitting them.
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befdelta7 · Brolly Dolly Joined: 24 Aug 2006 Karma :

hi people,

well, i just thought id take the old fork seals off as im bored, im still waiting on the new ones arriving.
10 mins later the old ones are out Exclamation

taking off the brake caliper is harder lol. thought it was a hell of a lot harder than that.

anyways,
i undone the top nut at the top of the forks, pulled the 2 half circle washer type things off the damper rod then the bloody stanchion fell out the bottom of the fork tube! i didnt need to do anything else, no undoing the nut at the bottom of the forks or anything! super simple to do, was really confused as people have been mentioning that its a bastard job to do. must just be lucky to have forks that are so simple.

all i got to do now is play the waiting game with regards to the new seals arriving.

i had a look over the forks and the bushes are in good condition, the seal on the caliper side was knackered, the seal on the otherside was fine. there was a slight amount of oil on the caliper side and it was black! the other side had loads of oil in it and it was red, still as new!

just got a question(s) for the people in the know:

how much oil goes into the 1992 supercity forks? the manual says 94 cubic inches i think.

and how do i bleed the oil once the forks have be topped up? just put oil in there, put the thing back together and pump the stanchion up and down a few times?

thanks for your replys!! Thumbs Up

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Jamie S · World Chat Champion Joined: 28 Dec 2006 Karma :

Ichy · World Chat Champion Joined: 15 Jul 2005 Karma :

Better check on the amount of fork oil you need, 94 cubic inches sounds way too much, you sure its not 94cc?

No need to bleed, the oil sorts it self out.
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befdelta7 · Brolly Dolly Joined: 24 Aug 2006 Karma :

befdelta7 · Brolly Dolly Joined: 24 Aug 2006 Karma :

befdelta7 · Brolly Dolly Joined: 24 Aug 2006 Karma :

yep i did get it wrong, its 24.4 cu in of SAE 7.5 oil to be pored into the forks(400cc)

also whats this mean in 'normal' terms?
"pour 24.4 cu in of SAE 7.5 type oil inside the rod, by extracting the sliding element from the bearing pipe till the plug hole is open"
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Dont do a wheelie in front of a traffic copper... it gets you 3pts and £220 fine.