Replacing gear box main oil seal

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nopdog
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Replacing gear box main oil seal

Post by nopdog » Sat Aug 24, 2019 7:38 am

Hi gents.
My 67 Victor has developed a nice oil river coming from the gear box oil seal I think. Doesn't leak much at rest(overnight) but go for a ride, stop and the oil is pissing out and then stops after a short while. Bike's been parked in the corner of the shed for the last 2 years and have decided to tidy it up a bit and ride it but was going well prior with only the usual oil weeping.
Question
From memory to replace the main oil seal in the gear box, the gear cluster, engine sprocket and the clutch will all have to be removed.
Is this correct?
Thanks in advance
Simon

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Re: Replacing gear box main oil seal

Post by nopdog » Sat Aug 24, 2019 8:30 am

I've just been reading Ubert767 post and my oil leak could be coming from the primary side as the oil is black even after a complete oil change.
Any one know what the part no is for the oil seal on the clutch backing plate.
It is listed in the spare part books of both the 441 and B50 but with no number.
Simon

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Re: Replacing gear box main oil seal

Post by Canberra » Sat Aug 24, 2019 9:02 am

1971/2 B50 and earlier B44 parts books lists it as 40-0243. I just took one into bearing shop and got a replacement with a metal outer - I cannot remember the number.

John

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Re: Replacing gear box main oil seal

Post by Ubert767 » Sat Aug 24, 2019 1:47 pm

Yes, the seal is 40-0243 and also known by the (Triumph) number 70-3833. You may also need the felt washer 90-6074 which sits in front of the sprocket securing nut.
Rob

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Ian Hingley
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Re: Replacing gear box main oil seal

Post by Ian Hingley » Sat Aug 24, 2019 9:19 pm

Gearbox oil shouldn't be black!

Change the gearbox oil for fresh. Change the primary oil for red ATF. Go for a ride. Is the oil pissing out golden thick gearbox oil, or thin red ATF?

If it's primary, it's probably the little oil seal in the inner cover plate thing.

Ian
66 BSA Victor Enduro, 72 BSA Lightning, 62 BSA B40 trials, 2015 Truimph Street Twin, 89 H*nda Bros 650, 96 Aprilia Moto 6.5, 2000 Aprilia Moto 6.5

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