| Also known as | E402 |
| Diagram | Fig. 13 — INNER AND OUTER CHAINCASE · ref 3 |
| Subsystem | primary |
| Listed in parts books | 1969–1971, 1973–1974 |
Washer – fibre, drain plug (·375" X ·563" X ·064")
Fibre drain-plug sealing washer for the primary chaincase, .375" x .563" x .064".
This is a small fibre sealing washer that sits under the drain plug in the primary chaincase, per the catalog listing at .375" x .563" x .064". It shows up in the parts book under the INNER AND OUTER CHAINCASE and INNER PRIMARY COVER — OIL PUMP figures, so its job is keeping the drain plug from weeping oil where it threads into the chaincase.
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It's a cheap piece to have on hand any time you pull the drain plug to change primary oil, since fibre washers compress and don't always reseal well once removed. The older parts books list this one under the E402 number, so if you're cross-referencing an older book that's the number to look for.
Our catalog record spans 1969 through 1974 across several listings, but we don't have anything narrowing it to one specific model — check what's actually on your chaincase before ordering.
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