Gearbox access through the chain case

[Stephen Foster]

G'day Steve.
It may be a bit hard with the motor & gearbox together but it is possible. I can't remember the seal size I used, 19mm id, 5mm thick, ?? od.
With the g/box removed I ground off the rivets (clutch side) and carefully popped out the heads. New oil seal was a nice snug fit in the case hole then sandwiched between the two plates and riveted back together from the g/box side.
Cheers

[muskrat]

G'day Steve.
Draganfly list a modern seal I assume gets fitted between the plates. https://draganfly.co.uk/shop/74580/oil-seal-primary-case/#67-1242
This one is the "plate' on the sprocket/gearbox side https://draganfly.co.uk/shop/74582/oil-seal-washer-a-rigid-and-plunger/#67-1243
This page shows the plate/washer, seal (fiber) and the "slinger (clutch side) https://www.bsawiki.com/chaps/9-engine/16-chapter08
Hope that makes it a little clearer.
Cheers

[Stephen Foster]

Thank You Jim ,

I have now seen an old pair of crankcases with the seal in place so can understand the arrangement .
Will try Draganfly later .