| Also known as | T2442 |
| Diagram | Fig. 12 — CHAINCASE AND CHAINS · ref 24 |
| Subsystem | primary |
| Listed in parts books | 1968–1970 |
Joint washer
A joint washer for the primary chaincase assembly, listed under 57-2442 (alias T2442), later superseded by 71-1457.
This is a joint washer that lives in the chaincase area, per the parts book figure it appears under. It's a gasket-type piece meant to seal a joint in the primary chaincase assembly, keeping the oil where it belongs instead of weeping out around a mating surface.
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The catalog shows this under 57-2442, with T2442 as the older-style alias you'll see in earlier books. It shows up across a run of catalog listings from 1968 through 1970, so if your parts book or a prior build sheet references either number, they're the same physical piece.
Triumph later superseded this part with 71-1457, so if you're chasing this down for a repair and 57-2442 comes up short or discontinued, that's the number to ask about next.
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