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Removing Gearbox Sprocket? #739845
06/25/18 6:05 pm
06/25/18 6:05 pm
Joined: Sep 2014
Posts: 72
GA
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eelmgren Offline OP
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eelmgren  Offline OP
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I've got a 1970 A65. What's the best/easiest way to remove the drive sprocket? I've read several threads that speak to this, but neither the thread discussions or my manuals are real clear.

I've got the clutch basket off, haven't got the cover plate off or split the cases yet. I understand once the cover plate is off I can fit a VERY deep socket, but have also seen references to removing it after the cases are split. I don't see a removable splined shaft in the overhaul or parts manuals. Wouldn't I still need the deep socket? Or - if all looks good, can I just leave it on with the transmission?

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Re: Removing Gearbox Sprocket? [Re: eelmgren] #739851
06/25/18 6:41 pm
06/25/18 6:41 pm
Joined: Aug 2005
Posts: 1,400
melbourne florida
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bodine031 Online content
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melbourne florida
Pull off the cover plate (5or6) flat head screws. I would use a Impact driver you wack with a hammer with the proper slot bit. Then with the cover off jam the sprocket so it won't turn and a deep socket with a 1/2 impact to remove the nut.

Re: Removing Gearbox Sprocket? [Re: eelmgren] #739864
06/25/18 8:22 pm
06/25/18 8:22 pm
Joined: Jan 2004
Posts: 3,723
ca, us
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DMadigan Offline
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You can dismantle everything in the gearbox except the high gear and bearing if you leave the sprocket in place.
A deep 1-1/2" socket is needed. I believe there are 4WD ball joint sockets in that size deep enough. I welded a 1" socket 1/2" drive onto a 1-1/2" 3/4 drive socket.

Re: Removing Gearbox Sprocket? [Re: eelmgren] #739869
06/25/18 8:55 pm
06/25/18 8:55 pm
Joined: Sep 2004
Posts: 798
Farnham, Surrey, UK
gunner Online content
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gunner  Online Content
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Farnham, Surrey, UK
In my experience the gearbox sprocket nut usually needs a box spanner to undo it, the main problem is finding a socket deep enough to fit, box spanners are easier and cheaper to find although being made of softer steel can cause wear and slippage.

If you can find a socket to fit the go for it as it will be easier, either way use penetrating oil and heat before attempting to undo.

For info the 1970 A65 manual posted Here page 20 part no 2, suggests the nut is 1-3/16 whitworth so might be worth checking what size nut is fitted.

Last edited by gunner; 06/25/18 8:57 pm.

1968 A65 Firebird
1967 B44 Shooting Star
1972 Norton Commando
Re: Removing Gearbox Sprocket? [Re: eelmgren] #739871
06/25/18 8:57 pm
06/25/18 8:57 pm
Joined: Sep 2017
Posts: 62
Windsor, Virginia, USA
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VANDOLSON Offline
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VANDOLSON  Offline
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Windsor, Virginia, USA
If you are not pulling the transmission I bought a very deep 1 1/2 in socket for doing this.
The socket is about 4 1/2 inches deep internally. Fits over the trans main shaft all the way to
The sprocket nut. Had a rounded crown that I had to grind flat so it would lay flush
Against the sprocket to grip the nut. Then as stated jam or use the chain to prevent
The sprocket from turning. The torque on the nut is 100 ft lbs on my 1971! Harder to
Retorque then to take off. Socket cost me around $25 but well worth it to me. I mean
Who can pass off buying a tool?! LOL

Re: Removing Gearbox Sprocket? [Re: eelmgren] #739872
06/25/18 9:27 pm
06/25/18 9:27 pm
Joined: Aug 2001
Posts: 3,916
argyll. scotland, uk
gavin eisler Online content
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gavin eisler  Online Content
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argyll. scotland, uk
old mini ball joint socket.
https://www.minispares.com/product/classic/TOOL03.aspx,

get a 2 foot length of 2 x 3/4" wid, use that as a lever on the brake pedal, undo the nut. If it has been on a long time, after the tabs are knocked back dont be surprised if its finger tight.


71 Devimead A65 750
56 Norbsa 68 Longstroke A65
Cagiva Raptor 650
MZ TS 250
The poster formerly known as Pod
Re: Removing Gearbox Sprocket? [Re: VANDOLSON] #739873
06/25/18 9:31 pm
06/25/18 9:31 pm
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eelmgren Offline OP
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eelmgren  Offline OP
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Thanks, guess I'll shop for an extra deep socket

Re: Removing Gearbox Sprocket? [Re: eelmgren] #739907
06/26/18 2:56 am
06/26/18 2:56 am
Joined: Aug 2001
Posts: 4,470
Owego, NY, USA
Mark Z Offline
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Mark Z  Offline
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Owego, NY, USA
eelmgren, from your original post, it sounds like you're doing a total tear-down. If that's the case, and you're planning on pulling the gear cluster anyway, you could do that first, and then the tranny mainshaft won't be in your way, and you won't need such a deep socket to remove the sprocket nut.


Mark Z

'65(lower)/'66(upper, wheels, front end, controls)/'67(seat, exhaust, fuel tank, headlamp)/'70(frame) A65 Bitsa.
Re: Removing Gearbox Sprocket? [Re: eelmgren] #739910
06/26/18 3:17 am
06/26/18 3:17 am
Joined: Dec 2002
Posts: 3,252
arkansas
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leon bee Offline
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arkansas
Eelmgren: If you have a welder there, just go to the plumbing supply and buy a water heater element socket. They are plenty deep. Then weld a little flat on top, and then a nut.

Re: Removing Gearbox Sprocket? [Re: eelmgren] #739955
06/26/18 6:18 pm
06/26/18 6:18 pm
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eelmgren Offline OP
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GA
Got it off with a drift punch, but I will still have to get it back on. And yes, it is a total teardown. I've got no problem buying tools, but my box is already full of both tools I've used maybe once and special tools made for applications I haven't worked on in decades. I'd much rather modify something I already have.

Plumbing socket... Will they handle the torque? What is the torque? My books only list a few torque values and I don't see this nut listed.

Re: Removing Gearbox Sprocket? [Re: eelmgren] #739962
06/26/18 7:50 pm
06/26/18 7:50 pm
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Posts: 3,252
arkansas
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leon bee Offline
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arkansas
Man, that's the arkansas way, chisel and a BFH. I use my homade socket with the impact wrench. Ugly, but it's removed dozens of those big nuts.

Re: Removing Gearbox Sprocket? [Re: eelmgren] #739996
06/27/18 2:59 am
06/27/18 2:59 am
Joined: Aug 2001
Posts: 4,470
Owego, NY, USA
Mark Z Offline
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Mark Z  Offline
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Owego, NY, USA
Originally Posted by eelmgren
Got it off with a drift punch, but I will still have to get it back on. And yes, it is a total teardown. I've got no problem buying tools, but my box is already full of both tools I've used maybe once and special tools made for applications I haven't worked on in decades. I'd much rather modify something I already have.

Plumbing socket... Will they handle the torque? What is the torque? My books only list a few torque values and I don't see this nut listed.


I think 100 ft-lbs is overkill. The locktab washer does an adequate job of holding it in place. Just get it as tight as you reasonably can and bend up the locktab washer. You can probably dress up the nut and reuse it, but the locktab washer should be replaced.


Mark Z

'65(lower)/'66(upper, wheels, front end, controls)/'67(seat, exhaust, fuel tank, headlamp)/'70(frame) A65 Bitsa.
Re: Removing Gearbox Sprocket? [Re: eelmgren] #740051
06/27/18 5:38 pm
06/27/18 5:38 pm
Joined: Sep 2017
Posts: 62
Windsor, Virginia, USA
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VANDOLSON Offline
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Windsor, Virginia, USA
I agree that 100 ft lb torque as called for in the work shop
manual may be overkill since as stated it has a lock tab
Washer. I got mine torqued up to 85 and could really
Not get it more torqued with my 3/4” torque wrench
Without adding a pipe to extend the wrench for more
Leverage (my comment anout harder to retorque).
Bent the lock tab over the nut and called it a day.


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