| Also known as | E2534 |
| Diagram | Fig. 6 — CYLINDER BLOCK AND HEAD · ref 44 |
| Subsystem | engine top |
| Listed in parts books | 1963–1970, 1974 |
Thrust washer, 7/16 in.
A 7/16 in. thrust washer used in the cylinder block and head assembly on a range of Triumph unit-construction twins.
This is a 7/16 in. thrust washer, part number 70-2534, also listed under the older E2534 number. It shows up in the cylinder block and head figures across a wide run of Triumph parts books, from the 350/500 unit singles-based twins like the 3TA, 5TA, T90, and T100 variants through to the larger cylinder head assemblies, spanning catalog years from 1963 to 1974.
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A thrust washer like this sits against a rotating or pivoting component to take up end float and keep things running true rather than grinding against a shoulder or casting face. Given the figure titles here, it's associated with the cylinder head hardware rather than anywhere else on the engine.
It's a small, inexpensive part but one that's easy to lose track of during a top end rebuild, so if you're tearing into the head on any of these unit-construction twins it's worth checking this washer's condition and having a spare on hand before you button things back up.
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