Shock Works - rear shock info

[FluffyChicken]

I have a rear shock to service, called Shock Works that is all.
It's coil/oil as far as I can see with some adjustable piggy back which must do something.

I don't know rear shocks, but pulled it apart as basically oil had come through the main seal and it packed in.

The piggy back says it's high pressure, so leaving it as is as there seems no way way in to it.


It's a 165mm of a Marin (1997).
The DU bushings are shot so I can measure up and get some.
The main oul seal will have a code on it, just need a magnifying glass


What I want or know is what oil weight these would use (or at least a typical weight for say the similar Vanilla or Deluxe)

Now I'm off to search for myself so may find the answer, but figured someone might know or give hints and tips

 

[spacehopper]

Re:

(this is a fox shock.. but the principal is still the same..)

to service it correctly... you are going to need to depressurize (and then re-pressurize) the piggyback

as the IFP in the piggyback needs to be in the correct place in the piggyback..

removing all the oil will have (if the piggyback is still pressurized correctly) pushed the ifp right to the end (right hand side of the piggyback in the pic above) and reduced the pressure in the piggyback and this means the shock wont work correctly..

there is usually a rubber bung or similar (that may be sealed with wax or similar) in the end of the piggyback so it can be pressurised with a needle valve.. but they are sometimes pressurised to 400PSI!

the piggybacks can be modified to accept an air valve to make pressurising easier.. which i did myself with a noleen shock from a GT RTS..

 

[coomber]

Not sure if they all were, but the ones on the 1997 marin B17s were absolutely dross. So might not be worth your hassle if you can buy something (anything) better for under fifty quid.

 

[spacehopper]

ifp = Internal floating piston

 

[FluffyChicken]

It's not mine and cannot see anything for pressurising a piggyback. I think a Float of the same age is being used now.
It's just as a spare or to put it back to 'stock'

Main oil seal is easy to get hold of. DU eyelet bushing I'll have to measure up. Doesn't look designed to actually be serviced given to get the valving and seal off you have to crack the 'bashed do not unscrew' threading at the end.

But like I said I've never used a rear shock let along serviced one ;-)

Inside is quite simple and multilayered/diameter shims around the 'ports' spacer.

 

[FluffyChicken]

I assume 5wt in these as it seems quite thin (could be less)
If I don't pressurise, (was going for say 175psi if I did given RShox used that at the time according to Barnett's), then I guess I would just loose the adjustability the piggy back provides? (assuming I leave an air gap when filling before its mentioned)