| Listed in parts books | Not catalogued by year yet |
OIL SEAL HIGH GEAR 4 SPEED METAL BACKED
Metal-backed oil seal for the high gear shaft on the Triumph four-speed gearbox.
This is the oil seal for the high gear (mainshaft) on the four-speed gearbox, part number 57-0946M, and it's the metal-backed version. It sits at the end of the gearbox where the high gear shaft comes through the casing, and its job is simple: keep the gear oil in the box instead of letting it work its way out along the shaft.
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The metal backing on this seal matches how the originals were built, which gives it a bit more rigidity going in and helps it seat properly against the casing. If your gearbox has been weeping oil around the high gear area, a tired or hardened seal here is a common cause, and it's cheap insurance to replace it while you've got the cover off anyway.
We don't have a lot of extra catalog history on this one beyond the part number itself, but it's listed for the four-speed unit gearbox used across the 650 twins. If you're not sure which seal your gearbox takes, give us a call before you order and we'll sort it out.
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