| Also known as | F1880 |
| Diagram | Fig. 2 — CRANKCASE · ref 19 |
| Subsystem | engine top |
| Listed in parts books | 1960–1962, 1964–1971, 1974, 1976–1980, 1983, 1985 |
COPPER WASHER 5/16ID
A 5/16 in. ID copper sealing washer used at multiple oil-tight joints across Triumph engine and gearbox covers.
This is the 5/16 in. ID copper sealing washer Triumph used across a wide range of engine and gearbox joints where a bolt or stud passes through an oil-carrying face. It shows up under our records at 82-1880, with the older-style number F1880 for the same part. The catalog has it turning up in figures for the crankcase, chaincase, gearbox inner and outer covers, and the cylinder block and head on several small and mid-size unit twins, which tells you this is one of those washers the factory used in more than one spot rather than a single dedicated fitting.
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Being copper, it deforms slightly when torqued and creates a better seal than a plain steel or fiber washer would at a joint that has to hold oil rather than just clamp two surfaces together. Because it appears in so many figures across a long catalog span, it's worth keeping a handful in the parts drawer — these get reused any time you pull a cover or a stud that seats against one.
If your parts book calls for a copper washer at 5/16 in. ID in an oil-tight location, this is almost certainly the one you want. Check the specific figure for your model and year in the parts book before ordering to confirm the exact joint you're working on.
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