| Also known as | E3833 |
| Diagram | Fig. 2 — CRANKCASE · ref 56 |
| Subsystem | primary |
| Listed in parts books | 1964–1968, 1970–1971 |
OIL SEAL CLUTCH WINDOW TRI 500 1959-67 (20mm ID, 30mm OD)
Oil seal for the clutch inspection window (trap door) on the Triumph 500 twin primary chaincase.
This is the oil seal for the clutch inspection window, sometimes called the trap door, on the primary chaincase. It sits in the small round cover on the outer chaincase that lets you check clutch adjustment without pulling the whole cover off. The seal keeps the primary oil bath where it belongs instead of leaking out around that inspection door.
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Catalog listings tie this one to the Triumph 500 twin, with the legacy number E3833 showing up as the pre-metric form of the same part. It's a small, simple item but an easy one to overlook when you're chasing a chaincase that won't stop weeping.
Given the size of the part, it's worth keeping a spare on hand whenever you've got the chaincase open for other work, since replacing it later means going back in for something this small.
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