Clutch Removal Norton Commando
Article by Mark Trotta
A specialty tool is required to remove the clutch on Norton twin engines, which includes all 750 and 850 Commando models.
Steps To Remove Clutch
After outer chaincase removal, the clutch adjuster locknut and threaded clutch adjuster are removed.
The clutch diaphragm spring is released by applying pressure with a tool, then removing the large circlip.
CAUTION: The clutch spring is under pressure!
Although a tool can be fabricated, you can buy one for about $25. I purchased mine from The Bonneville Shop in Montana.
It functions the same as the Norton service tool # 06-0999. Fitment includes all Commando models 1968 and up.
Commando Clutch Tool Procedure
First, screw the bolt into the spring center. The factory workshop manual recommends at least 1/4" engagement.
With a wrench, tighten the nut that's under the bolt head, only enough to compress the spring so that it can rotate freely behind the spring clip (it will spin in place).
Do not over-tighten nut, or spring may get damaged.
CAUTION: Do not attempt to remove the circlip until the spring feels loose in the housing.
Once the spring is free to rotate, remove the circlip from it's groove with a flat-blade screwdriver.
The tool and diaphragm spring can then be lifted clear. Slacken nut to remove pressure from the spring.
Clutch spring retaining clip (55.0471) and clutch diaphragm spring (06.0770)
Clutch Plate Removal
This '74 Roadster had been sitting for so long, the clutch plates were stuck together in one piece!
They can usually be pulled out one at a time with a magnet or two.
Clutch plates did come loose after a little WD40 and some gentile prying with a flat-blade screwdriver.
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Clutch Pushrod
If you're removing the chainwheel (clutch drum), the clutch pushrod can now be removed. If not, you can leave it in place.
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Chainwheel removal requires another specialty tool.
Clutch locking tool (Norton # 06-1015 or equivalent) allows removal of the nut on the end of the gearbox mainshaft.
After removing nut and washer, locking tool fits over center hub, allowing removal of nut of gearbox mainshaft.
Norton clutch hub locking tool in use.
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Notes and Misc
Time to polish the chaincase.
Read: How To Polish Aluminum Engine Parts
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