SOHC.co.uk Forums > CB350/400

Tacho worm drive removal/installation

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Drew400:
Hi Andy,

I gave up on mine. Circlip out, no problem, but the rubber bung resisted all attempts! The word b%%%%%d sprang to my lips a few times.

Good luck with yours, but if it's any consolation, mine was vapour blasted in situ and barely leaks after the rebuild!

Cheers, D.

beemsquar:
I think I really need to get it out, it's worn and also I can't get the new oil seal in correctly as the PO has squished the metal flange inside and the seal won't seat properly.

I also have removed the circuit and tried to push it out, but you have to give it way more force than I'm willing to put on it to push it out, which is why I thought I would check if there's something else that needs to be removed first.

So close to getting this engine together now.

beemsquar:
Can anyone else offer any advice please?  I really want to get this all together now and don't want to force it out.

I dont think you can buy the bush part anymore from DSS or CMSNL :(

Clem2112:
These things seem to defy removal even after extracting the seal and circlip.
From memory I got the the seal out by screwing in 2 small screws and extracted it with pliers.
The circlip is a plain one and is fiddly to prise out.
I filled the cavity where the gear sits with plus-gas to ease the bush which is a tight fit.
Left that for a day or two to soak in warm conditions ... Might have put the whole thing in the oven ...only 100 C or so to be safe.
Next bit was a bit brutal but I saw no other way......
Got the shaft to move a bit by tapping the gear with an ally drift to protect the hardened teeth.
Then I  used a blunt flat bladed screwdriver as a wedge once the end was free of the blind hole
tapped that until there was enough gap to get the drift in. Then the side of the drift can be
hammered to drive the gear out.
 As mentioned thecgear comes out complete with its bushing.
Probably the trickiest engine part to dismantle so it's nice when it finally comes out !

beemsquar:
Thank you so much, this is vary helpful!  Do you know if you can fit a used bush inside or does it have to be replaced with a new one?

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