Another Speedo Question

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Guido-
Having it soaking in PB now. Does the axle separate from the sprocket? Can I use a soft mallet to tap the axle out from the side shown in my picture?
Thanks
 
Guido-
Having it soaking in PB now. Does the axle separate from the sprocket? Can I use a soft mallet to tap the axle out from the side shown in my picture?
Thanks
 
wjrich said:
Guido-
Having it soaking in PB now. Does the axle separate from the sprocket? Can I use a soft mallet to tap the axle out from the side shown in my picture?
Thanks
Click to expand...

Yes , just tap it out if your worried about the threads put a nut on, gently tap the drive at the side also watch your top hat.

J
 
wjrich said:
Guido-
Having it soaking in PB now. Does the axle separate from the sprocket? Can I use a soft mallet to tap the axle out from the side shown in my picture?
Thanks
Click to expand...

The axle should tap out of the top hat bushing. However, the top hat may come out of the gearbox along with the axle.

The axle is supposed to be a slip fit in the top hat bushing, and the top hat bush a tight or press fit in the gearbox.

I do not think you can harm anything if you support the top hat with something that fits close to the axle, then tap out the axle.

Slick
 
Hi

The axel is going through the top hat ,it should be left in the drive. Is that a mk 111? Cos if it is ,I know nothing, I'm not into 828's.

J
 
Hi

Buddy you'll be fine , knock it through , tap side of drive with mallet gently and it will come off , take top hat out , and then clean her up but if it is notchy , the boys will probably be right and it is duff.

J
.
 
texasSlick said:
The admonition not to use a drill, is because most drills turn CW. Tell some guy it is OK if the drill is reversible, and set to CCW, and Murphy's Law says he will use it in CW mode.

Most failures in the speedo gearbox are due to the internal worm wearing down to nothing.

this is due to lack of decent grease. I grease mine before any long ride , and then probably every month or two















With the gearbox removed from the bike, and with the cable attached to the gearbox, spin the drive dogs with the fingers while holding the end of the speedo cable to offer resistance. If no rotation of cable, the worm is shot.

There was a thread recently on home repair of gearbox posted on this Forum. IMO, a new Smiths is the way to go....avoid the knock-offs.

Slick
Click to expand...
 
wjrich said:
Tried to post this earlier- not sure where it went.

Read some great threads on the speedo drive box, but still don't know ho to detach it from the sprocket. Seems like it is fixed to the axle, but I can't see how to detach it. Any ideas out there?

Another Speedo Question
Click to expand...


WTF is it doing inside the brake drum
 
I do 69 till 72, 828's a couldn't tell you what the seat looked like, but that hub cover if that is what it is doesn't ring any bells for me, it's a speedo drive not the space shuttle!

Perplexed from Plymouth.
 
kerinorton said:
wjrich said:
Tried to post this earlier- not sure where it went.

Read some great threads on the speedo drive box, but still don't know ho to detach it from the sprocket. Seems like it is fixed to the axle, but I can't see how to detach it. Any ideas out there?

Another Speedo Question
Click to expand...


WTF is it doing inside the brake drum
Click to expand...

It's a MkIII. That isn't the brake drum (as the MkIII doesn't have a drum rear brake).

http://www.nortonmotors.de/ANIL/Norton% ... &Plate=023
 
Tried a gear puller which didn't work. Ended up whacking the axle with a mallet and got the drive loose. Pictures below show it after a gas bath. Internal drive is rough and sticks, so a new drive is in order. Interesting also was that when I pulled the drive off the axle, there was no washer/seal, and I was looking directly at the bearings and cir clip which didn't seem correct to me. Looking at the Old Britts/AN exploded diagram, seems as if the washer/spacer shown in the pic with the drive still stuck to the sprocket should have been placed between the drive and the sprocket…
Another Speedo Question

Another Speedo Question

Another Speedo Question
 
wjrich said:
Interesting also was that when I pulled the drive off the axle, there was no washer/seal, and I was looking directly at the bearings and cir clip which didn't seem correct to me.
Click to expand...


The OB MkIII rear wheel parts diagram shows the seal (06-5662, item 25) in the wrong place, it belongs the other side of the bearing, the AN diagram is wrong too.
The MkIII workshop manual exploded diagram of the rear wheel does show the parts in the correct order and if you check your sprocket assembly then that's where you should find the seal? :
Another Speedo Question



wjrich said:
Looking at the Old Britts/AN exploded diagram, seems as if the washer/spacer shown in the pic with the drive still stuck to the sprocket should have been placed between the drive and the sprocket…
Click to expand...

The large diameter washer [32] belongs where it is shown, spacer [11] fits between the sprocket bearing and the drive gearbox.

Another Speedo Question


I can't be sure, but from your photo I think the spacer [11] might still be stuck in the drive gearbox?

Also, if I remember correctly, my MkIII's assembly needed an extra spacer shim to prevent the drive gearbox from being forced against the sprocket when the axle nut was tightened.
 
LAB-

Thanks for your attention on this. The spacer was in fact still in the drive, not so visible to my inexperienced eye. I heated the box up and whacked it with a drift and mallet and it fell free. I'm also looking at the exploded views in my Workshop Manual and it does show the order of assembly you suggest- bearing, bearing circlip, spacer, drive box, washer (#32). My replacement parts catalog does ave the assembly in the manner illustrated on Old Britt's AN's diagram, which is probably where it's sourced from. You mention an additional spacer required on the MK III to prevent too much pressure on the drive box- what size and where in the order of assembly would that go?

Another Speedo Question
 
I used item 32 page 4 which is the copper washer from the oil pressure relief valve - put it on either side of spacer 11 - when the spindle nut is tight, the gearbox is held fixed but the sprocket should rotate freely.
 
wjrich said:
You mention an additional spacer required on the MK III to prevent too much pressure on the drive box- what size and where in the order of assembly would that go?
Click to expand...

I couldn't tell you offhand, but it needs to be thick enough to prevent the rear ring of the drive gearbox from rubbing against the sprocket boss, however yours might not need one? Personally I would put the shim between the bearing and the spacer.
I noticed you said you had to drift the spacer out of the drive gearbox which shouldn't have been necessary, but from your last photo it looks as if the spacer may have been cutting into the drive gearbox? If so, that may perhaps need further investigation?
 
Not a great photo, but it looks as if the spacer did cut in to the drive, perhaps the reason for the difficult removal? Axle tightened beyond recommended torque?
Another Speedo Question
 
wjrich said:
Not a great photo, but it looks as if the spacer did cut in to the drive, perhaps the reason for the difficult removal? Axle tightened beyond recommended torque?
Click to expand...

Possibly too much torque or perhaps the spacer has been spinning, but it seems clear from your last photo that whatever the reason it was obviously why you had so much trouble removing the axle.
 
regental said:
I used item 32 page 4 which is the copper washer from the oil pressure relief valve - put it on either side of spacer 11 - when the spindle nut is tight, the gearbox is held fixed but the sprocket should rotate freely.
Click to expand...

Copper is a no no in this situation. it will compress and cause the parts to become loose. It wasn't you that owned my bike before me was it. The twit put a copper washer under the clutch hub nut and expexred it to work. It worked all right. just wore out and left everything loose.
Use steel spacing washers for this task. They usually come on 20 thou thicknesses as far as I cam remember./ IWL assortments and GEE JAY assortments.
regards. Dereck.

ps I have only ever owned the righthand drive Nortons. Not interested in the ones with the gear change on the left.
 
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