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turbofurball

TY175 Output shaft seal?

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It looks like the seal might have gone, as my bike has decided to mark it's territory very thoroughly ... can it be swapped without major headaches?  And does anyone know what size it is?

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This is the seal

Loosen the drive sprocket nut first by bending the tab washer out of the way, select first gear, foot hard on rear brake to stop engine from turning whilst you undo the nut, remove the chain and drive sprocket, I think there's also a spacer on the shaft behind the sprocket, once you've slid that off, apply a bit of heat to the casing around the seal and you should be able to pop the old seal out.

When putting the new seal in, again a bit of heat on the casing and using the spacer as a guide and a suitable sized drift (usually a big socket or a piece of tubing) tap the new seal in keeping it square to the casing as you go.

Theoretically you should also replace the tab washer behind the nut on the drive shaft, also if the sprocket is showing signs of wear you might as well replace that at the same time

It's a fairly simple job if you have the right tools and a bit of mechanical savvy, but if you're not sure, then it's best to find someone who is

 

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As ourian explains but not how to pop the seal out. Clean thoroughly around the seal area and the shaft, WD40 or white spirit. Dry off and look carefully around the seal edge of the casing for any burrs or dings, carefully clean with a gentle scraping action using a suitable flat edged blade. Take a thin flat blade screw driver and carefully push in between the seal lip and shaft, downwards at a slight angle. Place a thin piece of aluminium or plywood against the seal housing to protect it from the levering (prying) action you will now need to exert on the seal, try this a number of times working around the seal and as access allows. The seal should start to move outwards and get easier to pry out. Once out clean the housing and check that no damage has been inadvertently done. When installing the new seal there is no need to use heat as the casing will dissipate this rapidly. Apply a thin coating of grease to the inside of the seal lip, wrap a piece of cling film around the shaft and smear some grease on the film this is to protect the seal lip and help it to slide onto the shaft. You could also apply a thin film of sealant around the outside edge of the seal to help it to stay in place. Drive in the seal to the housing as ourian explains. 

One way used to remove oil seals is to drill a small hole into the seal body and screw in a self tapping screw, repeat on the opposite side and use molegrips to pull the seal out.

BEFORE you fit the new seal ensure the output shaft is not ridged or rusty where the seal lip is going to run.??

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As Swept section says about the  self tapping screw method......done this many times and never failed.

 

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For anyone searching in the future, the seal is 26x38x5 single sided, and the collar is 20x26x11.3 (Yamaha p/n: 90387-202A0) :)

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