SOHC.co.uk Forums > CB350/400

Tacho worm drive removal/installation

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Clem2112:
I don't think (sure?) the bush is available separately and probably never was?

Come to think of it , the bush may remain in the casting when the gear is driven out.
I think the OD of the teeth is slightly smaller than the ID of the bush (and gear shaft plain dia)
so there is a clearance..... You will see either way.

Chris400F:
Looking at the parts manual the setup looks very similar to the G5 models.
I have an engine for those in bits so could have a look at the parts.
The shaft diameter is quite a bit smaller than the gear so you won't get one out without the other.
P/N for the bush (parts list calls it a collar) is 12435-377-000.
I don't think you'll find a new one (although you never know ....), found a S/H one and doubtless there are others:
http://www.ebay.co.uk/itm/75-Honda-CB400F-Supersport-Tachometer-Drive-Gear-Collar-OEM-Bushing-Cylinder-/400936697439

beemsquar:
Cheers guys, thats what I thought Chris. Looking at it from inside the rocker the gear looks larger than the collar, so I didn't want to force it.

The main problem other than the gear is that the collar itself is damaged and and new seal wont seat against the bush, the old seal I removed looked like it had been cut down and siliconed in place, but I don't fancy bodging it.

I have a spare rocker with an intact bush and screw, so If I could remove it I will swap them over, thanks for the link though, good to know I can possibly get a spare if needed.

Clem2112:
That picture of the bush in the ebay ad explains why it was so hard to drive out !
Over an inch of engagement in the alloy casting.

beemsquar:
At last I managed to get the little bugger out! I removed the one from my spare rocker cover easily by removing the circlip and gently tapping the worm drive with a piece of cut down acrylic so not to damage the splines.

The reason it wouldn't come out of the rocker I was using was because there were remains of the old oil seal in there still, once I had carefully picked it out, it came out as easily as the first one. It also explains why my new seal wouldn't seat properly! Panic over.

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