| Diagram | CHAINCASE AND CHAINS |
| Subsystem | primary |
| Listed in parts books | Not catalogued by year yet |
Fibre washer
A fibre sealing washer listed under the primary chaincase and crankcase figures, PN 11738.
This is a fibre washer that turns up in the primary chaincase and crankcase areas on the catalog pages it's listed under. Fibre washers like this one are used as a sealing or spacing layer under a bolt or plug head, giving a bit of cushion where a metal-on-metal seat isn't wanted.
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Our catalog record shows it appearing across a handful of listings from the mid-to-late 1960s into the early '70s, but we don't have a breakdown of which specific model or fitting point each one goes with. If you're matching this against a parts book, check the exact location callout before ordering.
The manufacturer code on file for this one says Lucas, but a fibre washer isn't an electrical part, so that tag is likely just a catalog quirk rather than a real maker attribution. Bring in the old washer or the surrounding hardware if you want to confirm the fit before buying.
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