| Diagram | Fig. 2 — CYLINDER AND CRANKSHAFT · ref 11 |
| Subsystem | engine bottom |
| Listed in parts books | 1969–1970 |
BSA "O"-ring, rocker spindle
A small O-ring that seals the rocker spindle, per the parts-book listing.
This is an O-ring that seals a rocker spindle, as listed in the CYLINDER AND CRANKSHAFT section of the parts book. Even though it turns up filed near the crankshaft figure, the description is plain: it's a small sealing ring that lives on the rocker spindle, keeping oil where it belongs instead of weeping out around the shaft.
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The catalog description here is brief, and the manufacturer field on this one points to BSA rather than Triumph, so before you order, check your own parts book or give us a call to make sure this is the right O-ring for your engine. It's a cheap and easy part to have on hand when you're doing rocker gear work, but fitment needs to be nailed down first.
We show this part appearing across catalog entries from 1969 to 1970, but that's just where it turns up in the records we have, not a confirmed fitment range for any specific model.
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