| Also known as | E8153, OS19 |
| Diagram | Fig. 3 — GEAR CLUSTER AND TIMING COVERS · ref 55 |
| Subsystem | engine bottom |
| Listed in parts books | 1968, 1970–1971 |
OIL SEAL,BSA C15/B25/B44 (40-0679)
Oil seal for BSA C15, B25, and B44 models, also known as 40-0679 or OS19.
This is an oil seal listed for BSA C15, B25, and B44 models, cross-referenced here under number 40-0679 and also known by the OS19 designation. It's a BSA part, not a Triumph one, despite how it's filed in our system — the description is plain about which bikes it belongs to.
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Oil seals like this one keep lubricant where it belongs and dirt out, sealing a rotating shaft against a housing. Beyond that, our records don't give us more detail on where exactly it sits in the engine or gearbox on these BSA singles.
If you're trying to match this up to a BSA C15, B25, or B44, give us a call and we can confirm before you order — we want to make sure the seal you get matches what's actually in your engine case.
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