| Diagram | Fig. 10 — Inner and Outer Chaincase, Hydraulic Tensioner · ref 21 |
| Subsystem | primary |
| Listed in parts books | 1975 |
Norton Gasket, Inner to Outer Chaincase
Gasket sealing the inner to outer chaincase on the 1975 Norton primary drive with hydraulic tensioner.
This is the gasket that seals between the inner and outer chaincase halves on a Norton, part number 06-5534. It sits at the primary drive, keeping oil in the chaincase where it belongs instead of leaking out along the joint between the two case halves.
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The catalog ties this one to 1975 and to the hydraulic tensioner version of the inner and outer chaincase, which points to the Commando Mk III primary case rather than an earlier hand-adjusted tensioner setup. If your bike still runs the earlier tensioner arrangement, check the case shape against this figure before ordering.
It's a one-time-use gasket job by nature — once you crack the chaincase open to service the clutch, alternator, or tensioner, plan on a new one going back in rather than reusing the old one.
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