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Old 02-24-2013, 08:10 PM   #1
AussieGreg's Avatar
Join Date: May 2011
Location: Australia
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Default Triumph 21 timing / gearbox case stuck

I recently bought a 1957 triumph 21 350cc. The bike is pretty much original and seems like replacing the oil, new spark plugs, carb clean and a new battery and the thing will be good as gold. The only thing is the kickstart spring snapped and I'm trying to get the case off.

I have undone the screws which are on both covers and the nut in the middle of the gearbox cover. Is there anything else I need to remove? The cases are stuck on super tight. Is it just the previous guy went overboard with the gasket concrete?

How do I remove the cases?
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Old 02-28-2013, 09:09 AM   #2
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Default Re: Triumph 21 timing / gearbox case stuck

Hi, I have a 1961 Triumph 21 and although there are small differences year-to-year I think the same applies for your bike as what I see in my manual. I quote: "To remove gearbox outer cover. Second gear should be selected and the kickstarter lever taken off before removing the outer cover. Remove the four screws and two nuts which secure the gearbox outer cover and use the gearchange pedal to pull the cover off as a complete assembly. Disconnect the cover from the clutch cable."
Grain of salt: I have not done this myself on my bike... yet.
Have a look at the link below, where you will find a scanned manual for the 1959-1960 500 unit engine, closest thing I could find to yours:

Page 26 shows an exploded view of the gearbox cover and you can see the two central studs as well as the four screws on the outer edge of the cover.

the Big D Cycle website has other manuals for reference that are quite useful.

I hope this helps, good luck!

Last edited by wipeout; 02-28-2013 at 09:33 AM.
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stuck, timing cover, triumph, twenty-one, unit

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