M1R Forks Rebuild

81Lav

81Lav

Hero member
Location
NSW Australia
I have a question for the M1R experts.

I am rebuilding a set and cannot remove the stanchion tube from the slider on the Compression fork.
When I try the bottom of the stanchion seems to bind in the old fork seal.

I am planning to replace the seals so I suppose I could just cut out the old seal and see what gives
but was just wondering if anyone else has had this issue and if so how did they resolve it?

Also The rubber seal on the rebound adjuster has split, does anyone know where to get parts for these suckers?

Cheers
 
I have 38mm MIRs but don't remember what they looked like wen I pulled them apart - 25 years ago! Quite a few forks with teflon bushes fitted require (careful!) removal of the seal circlip, then just use the stanchion like a slide hammer and the seal comes out of the fork leg with all the innards (seal is pushed out by the bush).

Someone else may come along with more detailed info!
 
Hi Quentin,
Thanks for the input.
These are the 41.7mm ones.
I have removed the circlip and tried exactly what you suggested (without getting too excessive!)
The seal is not budging and the stanchion jams in the seal.
Everything else has come appart as it should and the fluids whilst dirty are not full of sludge.
This seems to suggest that everything is not all corroded and welded togeather!

Before I get more brutal I will see if there are any other responses.

Cheers
 
If it has been assembled correctly, there should be a large washer between the seal and the upper slider bush and with close clearance to the stanchion.  Upper bush, washer and seal should eventually pop out, with a bit of force.  This assembly is shown incorrectly in the SFC1000 parts supplement with the washer on top of it all, totally useless...

piet
 
Awesome guy's thanks for this.
I think its the washer that Piet refers to that's holding things up.
I will get a bit more energetic with the removal and if that doesn't work I will pull the seal first.

I have the manual Lothar Thanks  :) but as Piet states my manual shows the washer under the dust seal (not the oil seal).

Now all I need to do is find the external rubber seal on the rebound adjuster!

Thanks again for the help.
Cheers
 
So I got the forks apart.
Lots of gunk particularly in the rebound side.

The damping mechanism has several "O" rings that are immersed in fork oil.
Do these need to be anything special ie Viton?

Does anyone have any ideas for replacement of the external rubber shroud that sits under the rebound adjuster.

Cheers
BK
 
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