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Classic, Vintage & Veteran For Coventry and Meriden Models. Anything pre-Hinckley goes.

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Old 11-20-2011, 08:11 PM   #1 (permalink)
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Transmission Rebuild

My '71 Bonnie is hard to get into gear sometimes and jumps out of gear some as well. I am guessing I need a transmission rebuild. I am not a mechanic but I can follow directions semi-well. For one, does it sound as if I need to rebuild the transmission? Secondly, where do I find instructions, what do I need to buy and are there special tools I will need? You guys have been great with all the help and I am asking for yet more.

Thanks!
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Old 11-21-2011, 03:23 AM   #2 (permalink)
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Originally Posted by BOBDE View Post
My '71 Bonnie is hard to get into gear sometimes and jumps out of gear some as well. I am guessing I need a transmission rebuild. I am not a mechanic but I can follow directions semi-well. For one, does it sound as if I need to rebuild the transmission? Secondly, where do I find instructions, what do I need to buy and are there special tools I will need? You guys have been great with all the help and I am asking for yet more.

Thanks!
I would not rush into any assumptions about the tranny. All transmissions everywehere, usually give up on bearings before anything else, and you'd quickly know a bearing was running out.

Your problem is quite likely a combination of clutch adjustment and/or some springs in the gearbox outer cover. The '71 model had a rotten camplate retaining spring setup that caused many owners to find false neutrals and other strange things during gear changes.

You do need to acquire a workshop manual and parts catalogue. I have mislaid the link for a free download but someone may be able to help you out.

Summing up: Some minor mechanical work from you and a few new springs here and there, should see this bike OK. RR
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Old 11-21-2011, 09:50 AM   #3 (permalink)
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I agree... carefully adjusting your clutch will solve a lot of going-into-gear problems. That, and holding the clutch in while letting the bike warm up a bit goes a LONG way to stopping that first-gear *crunch*, first thing in the morning.

Popping out of gear, however, could be worn dogs on the gears in the transmission. My '72 popped out of 2nd all the time when I'd get on the throttle in 2nd gear, and it was due to badly rounded-off gear dogs.
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Old 11-21-2011, 10:12 AM   #4 (permalink)
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This is my favourite manual website:

http://www.classicbike.biz/Index.htm
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Old 11-21-2011, 11:44 AM   #5 (permalink)
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I'll add this tidbit of info I picked up while doing a recent engine overhaul. Tranny was a 4 speed but should apply, regardless.

The shift forks have rollers that run in the cam plate. I found one of my rollers was stuck firmly on the pivot. These appear to be riveted on by peening over the pivot. I assumed these were replacements and an overzealous peening operation seized the roller to the pivot. I ended up having to cut it off with a Dremel.

Later, while rummaging thru my friend and former dealer's stash of used parts, I came across a used shift fork that had exactly the same situation. Roller was firmly seized to the shaft. In both cases, the roller had a flat spot on it from rubbing rather than rolling.

I would think that if you have a seized roller in there for any length of time, both the roller and the cam plate goove will wear and this will in turn provide imcomplete engagement of the driving dogs on the gears. So, not saying this is your problem, but something to look for should you tear into your tranny.

I would have assumed my stuck roller was an anomoly until I found a similar one in Lance's stash. My guess is there are others out there.

regards,
Rob
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Old 11-21-2011, 12:54 PM   #6 (permalink)
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Using the books and this forum

I'll add a few bits from my experience. First off, the word transmission might scare a well experienced mechanic, let alone a hobbyist like myself, but back in the 70s I had the opportunity to replace shifter forks in a Volvo and it was pretty easy and worked. But still... having the gearbox out of my two Triumphs has turned confusion to understanding and joy. Download the Parts Book and Shop Manual from the link above and after that, if you decide to take the plunge and remove your gearbox from your bike, you might get the same joy of figuring it all out as I did - fondling the parts on the work bench blew me away to learn that the power comes in the gearbox through the clutch basket on the Mainshaft, through the selected gear on the Layshaft and then out to the Primary Sprocket which rotates on the same Mainshaft the power came in on - Brilliant! Discovering this was such an exciting epiphany, the time spent turned out to be very well spent.

Good luck - and remember, the folks here will help you every step of the way.
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Old 11-21-2011, 04:01 PM   #7 (permalink)
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Quote:
Originally Posted by RetroRod View Post
You do need to acquire a workshop manual and parts catalogue. I have mislaid the link for a free download but someone may be able to help you out.
Can find here:

http://www.classicbike.biz/

oops! didn't see DerryUK's post. Sorry for oversight.




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Last edited by triumpt120rv; 11-21-2011 at 04:47 PM. Reason: apologies to DerryUK
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Old 11-23-2011, 10:06 PM   #8 (permalink)
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I very much appreciate all the advice and help. I shall give the camplate retaining spring setup a shot at repairing. I have ordered parts from my supplier. I'm thinking an investment in gaskets would turn out well!

Thanks to everyone on this site. You guys are soooooo helpful and knowlegeable.

Bob De.
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Old 11-24-2011, 11:50 AM   #9 (permalink)
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Bob,

You can modify your tranny to use the plunger type cam plate detent. Somebody here has a complete tooling set up to drill and tap your case for the plunger. It is packaged in a wood box. Somebody here can probably tell you who it is and what the costs would be to get it to you. I just don't remember.

You might try searching cam plate plunger tools or something to that effect to find threads on the topic.

regards,
Rob
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Old 11-30-2011, 08:05 AM   #10 (permalink)
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I'm going to look at a '71 today that jumps out of 2nd gear under load, most reading points to worn dogs and the leafspring. I'm gonna do the conversion for the plunger (link below) if I buy the bike today. Just need to find a place to buy the gears and what not. Suggestions?

http://www.triumphrat.net/classic-vi...onversion.html

http://www.triumphrat.net/vintage-te...unger-mod.html

Last edited by pyromedic; 11-30-2011 at 11:39 AM.
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