| Also known as | 70-8153 |
| Listed in parts books | 1968, 1970–1971 |
OIL SEAL BSA CRANK T/S UK
An oil seal for the crankshaft timing side on BSA engines, also listed under part number 70-8153.
This is an oil seal for the crankshaft timing side on BSA engines, listed in our records under 40-0977P with the older alias 70-8153. The description in our catalog names it specifically as a BSA crank timing-side seal, not a Triumph part, even though it turns up filed under a Triumph-style part number in our system.
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An oil seal like this sits where the crankshaft passes through the timing side of the crankcase, keeping oil inside the engine and grit and moisture out. We don't have detailed fitment notes beyond what's on the part itself, so if you're matching this to a specific BSA model, give us a call and we'll confirm before you order.
We don't carry much more detail on this one in our records. If you're not sure this is the seal your engine needs, best to check the physical part against what you're pulling off the bike, or call the shop first.
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