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Tacho Drive Oil Seal

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Martin6:
My cylinder head cover is back on and I've tried to fit the new tacho drive seal. I just can get it to work.

I'm putting it in the hole / shaft that the drive gear spindle exits the cover into. I'm putting the seal in, flat face outward. It goes over the gear spindle and flat against the cover, but I can't then get the end of tacho cable in far enough for the lock screw to engage. It seems to need to go 2 to 3mm further in. It engages fine without the seal in there. I tried putting the seal in the other way round, with the cup end outwards, still no joy. The old seal is definitely not in there and the hole in the cover is clean.

Any idea what i'm doing wrong? I'm reluctant to apply too much force to pushing the tacho cable onto the seal, but I have pushed it reasonably hard and the seal seems pretty solid.

Bryanj:
It goes flat side outwards and are you sure the old one is out?

Oddjob:
I seem to recall I tap them down with a long 8mm socket, just wide enough to go into the drive housing but the internal bit is wide enough to accommodate the drive gear shaft. Works on the 500/550 can't see why it wouldn't work on the 750. Seal markings outwards

Skoti:
Is the oil seal the correct dimensions? Make sure it's the correct depth.

4.8x14.5x4mm
Genuine part number 91256-096-651

It's not normally a tight fit, mines pushed in by hand with a 1/4" drive 8mm deep socket.


Good luck

Skoti

McCabe-Thiele (Ted):
Check the new  seal is the same size as the old one if you still have it. Just in case a different drive unit has been used in the past.
Last thought is the cable an original part or is it corroded where it slides in?

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