Cam Backlash Gear Without Pin/Tools - Triumph Forum: Triumph Rat Motorcycle Forums
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post #1 of 16 (permalink) Old 08-20-2017, 06:48 AM Thread Starter
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Cam Backlash Gear Without Pin/Tools

I've seen some great posts throughout here on the specs/process to DIY a set of locking pins/alignment tools for the cam backlash gear, which is all great stuff. It also appears that Triumph no longer manufacture/sell those tools, so this is seemingly the only route should I need to remove my cams (for instance, for sending overseas in a couple of weeks for a profile grind )

My issue is that I have very limited tools in my garage - the usual spanners, sockets etc - and that's about it, which will make it very difficult to jimmy up a set of these tools.

My question is - and I'm hesitant to ask (but will anyway) as I'm sure if it was that simple there would be reference to it already - can I simply get a few heavy duty cable ties and fix the backlash gear in place prior to removing (& simply snip them off when installed back in the bike)? I'm assuming being made of plastic they won't damage the gears, & I can swing off a couple of them fixed together so also assume they'd be strong enough to hold in place...

Can anyone highlight any issues I haven't thought about that would prevent this approach from being feasible?

Many Thanks
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post #2 of 16 (permalink) Old 08-20-2017, 07:15 AM
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You might be able to use ties, but I just bought a small machine screw with a nut and secured the gear through the hole. No need for Triumph's tooling. You can size the hole in the gears using a drill bit index if you have.
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post #3 of 16 (permalink) Old 08-20-2017, 12:04 PM
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I do what Felony does, which works great as long as you don't drop those little bits down into the motor. Whatever you do, make sure all holes are plugged/covered by shop rags before.

Not heard about anyone using cable ties. Not really sure they will fit through that hole. And the hole is bigger on one side than the other, so that angled head in Felony's picture is nice because it slides into the bigger side and keeps stuff from moving. But if it moves a bit it's not the end of the world, you can realign the gears if need be.
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post #4 of 16 (permalink) Old 08-20-2017, 04:58 PM
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+1 on the bolt, worked for me.


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post #5 of 16 (permalink) Old 08-20-2017, 05:27 PM
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Spot weld them together. Then break the weld later. I had a friend that would spot weld his a/c clutch together on his old Dodge station wagon in the Spring and break the welds off in the fall. Worked for him. Might not be good on cam gears.


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post #6 of 16 (permalink) Old 08-20-2017, 07:02 PM
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you don't need the alignment pins for removing your cams if you are disassembling the backlash gears from your cams, i would recommend removing the backlash gears when you send your cams away to be re-ground.

while your cams are away you will have plenty of time to arrange for your nearest machine shop or friend with a lathe to make some for you out of some suitable mild steel rod or even a suitably sized bolt ready for when you get your cams back, it's worth spending a few quid/dollars to get them made as they'll be handy for any future valve shimming job . you have the dimensions from the thread you read to give to who ever makes them for you.

a little tip for when you get them, drill a hole through the butt end of each pin and lock-wire both of them together with a 4"- 6" length of thin lock-wire, this stops one dropping into the engine if it accidently becomes dislodged during use, and makes it harder to lose one while they are rattling around your tool box inbetween valve shimming jobs.

who wudda thought id wanna bonneville!

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post #7 of 16 (permalink) Old 08-20-2017, 07:27 PM Thread Starter
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Quote:
Originally Posted by Felony View Post
You might be able to use ties, but I just bought a small machine screw with a nut and secured the gear through the hole. No need for Triumph's tooling. You can size the hole in the gears using a drill bit index if you have.
Beauty, that's a great idea, cheers!
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post #8 of 16 (permalink) Old 08-20-2017, 07:29 PM Thread Starter
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Spot weld them together. Then break the weld later. I had a friend that would spot weld his a/c clutch together on his old Dodge station wagon in the Spring and break the welds off in the fall. Worked for him. Might not be good on cam gears.


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If I had the tools to do that I dare say I could DIY some backlash tools!
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post #9 of 16 (permalink) Old 08-21-2017, 08:14 AM
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I used an old drill bit that fit the largest hole and ground one end down to fit the smaller hole size. But you need a grinder or a friend who has one. Mine aren't pretty but work great.


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post #10 of 16 (permalink) Old 08-21-2017, 09:18 AM Thread Starter
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Cheers - I might knock on a few neighbour's doors, someone will have a grinder I'm sure!
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