| Also known as | F4078, M82-4078 |
| Diagram | Fig. 15 — SWINGING ARM, SUSPENSION UNITS AND CHAINGUARD · ref 49 |
| Subsystem | primary |
| Listed in parts books | 1963–1966, 1968–1970, 1974 |
THRUST WASHER, SWINGARM .064
Thrust washer, .064 in. thick, for the swinging arm pivot on Triumph swingarm/suspension assemblies.
This is a thrust washer that lives in the swinging arm assembly, sitting on the pivot spindle to take up end float where the swinging arm rotates against the frame. It's listed at .064 in the catalog, which tells you the thickness you're working with when you're shimming things up during a swingarm rebuild.
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The part shows up across catalog listings for the swinging arm and suspension unit figures from the mid-60s into the early 70s, and it's also carried under the F4078 and M82-4078 numbers if you're cross-checking against an older parts book.
These washers are the kind of thing worth having a couple of on hand when you've got the swingarm out anyway - cheap enough to replace on principle rather than reuse a worn one and fight slop in the pivot down the road.
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