| Also known as | T2440 |
| Diagram | Fig. 11 — CHAINCASE AND CHAINS · ref 22 |
| Subsystem | primary |
| Listed in parts books | 1968–1971, 1974 |
ROTOR INSPECTION COVER,TRIUMPH 1968-74
Alloy inspection cover over the alternator rotor on the outer primary chaincase, Triumph twins 1968-74.
This is the small round inspection cover that sits on the outer primary chaincase, over the alternator rotor. It's the alloy plate you pop off to check the rotor and stator without splitting the primary case open. Catalog listings place it on Triumph twins from 1968 through 1974, under the chaincase and chains section of the parts books.
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The part number 57-2440 replaced an earlier factory number, 57-4645, so if your parts book or an old invoice shows T4645 or 57-4645, it's the same physical cover under its older identity. The legacy T2440 form is just the pre-metric-catalog way of writing the same 57-2440 number.
It's held on with three screws and normally seals against a gasket. If yours is scarred up from being pried at with a screwdriver over the years, or the threads for the screws are stripped, it's a straightforward swap - no primary case splitting required to get at it.
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