| Diagram | Fig. 11 — GEARBOX INNER COVER AND SELECTORS · ref 21 |
| Subsystem | gearbox |
| Listed in parts books | 1976–1980, 1983, 1985 |
Joint washer, inner cover to crankcase
Joint washer sealing the gearbox inner cover to the crankcase, later carried under Triumph part number CD-534.
This is the joint washer that seals the gearbox inner cover to the crankcase, listed in the parts books under the GEARBOX INNER COVER AND SELECTORS figure. It's a gasket, not a metal washer in the fastener sense - it keeps oil where it belongs at that mating surface. Older parts books list this same piece under the 8T legacy number, and Triumph later carried it forward under the CD-534 part number, so if you're working from a different book don't be surprised to see either of those in place of 57-7012.
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Catalog records put this gasket in gearbox inner cover work across 1976 through 1985, and it turns up in six separate catalog listings over that span, which tells you it's a piece that gets replaced whenever the inner cover comes off. It's not an expensive part, but a torn or hardened one will leak, so it's worth having on hand any time you're in there for selector work or a clutch job.
If your parts book shows the CD-534 number instead of 57-7012, that's the same gasket under Triumph's later numbering - either number should get you the correct part.
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