| Diagram | Fig. 3 — CRANKCASE · ref 50 |
| Subsystem | gearbox |
| Listed in parts books | 1969–1970 |
BSA Oil pump bottom plate
Oil pump bottom plate, part number 67-1391, seals the pump body on the crankcase-mounted oil pump assembly.
This is the bottom plate for the oil pump, part number 67-1391. It appears in the crankcase and oil pump figures in our records, sitting against the pump body to seal the gears and keep the feed and return sides of the pump working as they should. It's a simple stamped piece but it matters — a plate that's warped or scored can let oil bypass internally and starve the rest of the engine.
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Our catalog data ties this part number to appearances across 1969 and 1970 listings, though we can't say more precisely which specific model years it was fitted to beyond that. Manufacturer records on this one point toward BSA rather than Triumph, so if you're working on a Triumph engine, check that this is actually the part your parts book calls for before ordering.
If you're rebuilding an oil pump, it's worth inspecting this plate along with the pump body and gears for wear at the same time — flatness on the mating faces is what keeps the pump pumping instead of just churning oil in a circle.
We've never carried this one. Tell us what you're after and we'll go looking — you'll get a price and photos before you commit to anything.
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