| Also known as | T2279 |
| Diagram | Fig. 10 — CLUTCH · ref 23 |
| Subsystem | primary |
| Listed in parts books | 1967–1971, 1974 |
Cupped washer
Cupped washer that seats the clutch nut against the clutch center on the mainshaft, PN 57-2279 (also listed as T2279).
57-2279 is the cupped washer that sits at the clutch center on the mainshaft, in the clutch assembly of the primary side. It's shaped so the clutch nut seats into its recess when you draw the clutch assembly up tight on the mainshaft, giving the nut a proper abutment to bear against instead of just clamping down on a flat surface.
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This one shows up across a run of clutch figures in the catalog from 1967 into 1974, so it's a part that stuck around basically unchanged for a while. The older book reference for it is T2279, same physical washer, just the earlier numbering style.
It's a small piece but it does real work every time that clutch nut gets torqued down, so if the one in your clutch is worn, chewed up in the recess, or missing entirely, it's worth putting a proper replacement in rather than making do.
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