Please help me on this.
I have a 98 Vmax and I have oil leaking from behind the clutch slave cylinder at a seal known as an "SDO type" seal. I don't know what "SDO type" means.
My question is, can this seal be installed without splitting the case? My service manual does not stipulate.
Thanks in advance.
Jim
SDO refers to Standard(s) Developing Organisation. It appears immediately in a sequence of information on the outward facing edge of the seal as 'SDO 8.8 22 6'
This means Standard(s) Developing Organisation 8.8mm inside diameter, 22mm outside diameter, 6mm width or thickness. i.e. it is an engineering standard measurement for oil seals.
The previous replies in this thread have given you most of the clues on what to do to replace it but I've just done this job on the clutch push rod seal so here are a few tips.
The old seal has to be removed (duh). I’m sure there is a tool for this job but I didn’t have one and will probably never use one again, so I improvised.
Depending on its condition the old seal could fall out or be very difficult to remove. If it was installed with a sealer then it probably will be difficult to move. I removed mine by fashioning two 25cm, metal rods. I flattened the ends and then made a right angle bend 3mm from its flattened end.
The external face of the seal is molded on a metal disk like a washer to give the seal rigidity and strength. Remove the push rod. The 3mm bends can then be used as grappling hooks (wheel puller style) behind the face of the seal and I was able to pull the seal out.
Once its out you have to clean the rubbish out of the space you just removed it from. Use a suitable solvent to remove dirt and oil from the seal cavity. Old sealant may require you to use a scraper or fine brush but be careful not to scratch the seal seat in the cases. The cleaner the cases, the easier the new seal will seat in.
Sean is right. Clean (and polish) the push rod to remove any burrs, scratches or corrosion from the shaft.
When these are clean, you can apply a sealer which Yamaha sell or something like a Loctite sealer. I didn’t use a sealer and it sealed just fine.
When you put the new seal in you should use a suitable drift to press or tap the seal in into its seat. Make sure the drift is perpendicular to the seal and use light force. You do not want to bend the metal substrate of the seal. Check it as you go to see that it is going in evenly. If one side is high, tap it down lightly until it is even, before proceeding further.
I left the push rod in place, oiled the seal with engine oil, placed it over the push rod and pressed it to the seat in the case. I then put a metal washer on the push rod, pushed the washer down onto the face of the lightly seated seal and used a tube spanner as a drift to lightly tap the oil seal into its seat. Worked like a charm.
Don’t forget, the push rod seats into the convex face of a metal plunger (piston) in the slave cylinder and needs to have grease packing before you re-apply the slave cylinder assembly so that the top of the push rod does not press on bare metal. The manual doesn’t mention this.
Hope this helps.
