| Also known as | 57-948, T948 |
| Diagram | Fig. 5 — OIL PUMP, GEARBOX SPROCKET · ref 5 |
| Subsystem | gearbox |
| Listed in parts books | 1960–1962, 1964–1965, 1968–1971 |
Rubber sealing ring
Rubber sealing ring for the gearbox sprocket/crankcase area, likely at the speedo drive housing.
This is a rubber sealing ring listed under Triumph part number 57-0948, also found in older parts books as 65-3395 and under the T948 legacy number. It shows up in the catalog against the oil pump, gearbox sprocket, and crankcase figures, so this is a seal that sits somewhere in that cluster of parts where the gearbox and crankcase come together.
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Other catalog listings for this same seal describe it as a drive housing seal associated with the speedo drive, which fits with its appearance near the gearbox sprocket area — that's typically where a speedometer drive pickup lives on these engines. As a rubber seal in that location, its job is keeping oil in and dirt out at a joint that gets disturbed whenever the housing or sprocket cover comes off.
It's a small, inexpensive part to have on the shelf, and one that's easy to overlook when doing gearbox or crankcase work — if you're pulling the drive housing or sprocket cover, it's worth checking the old one and having a replacement ready rather than trying to reuse a worn or torn seal.
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