| Diagram | Fig. 5 — OIL PUMP, GEARBOX SPROCKET · ref 34 |
| Subsystem | gearbox |
| Listed in parts books | 1969–1971 |
SUMP SCREEN BSA UNIT SINGLES (5/16" Hole)
Sump screen for BSA unit-construction singles, 5/16 inch hole, fits into the oil pump/sump area.
This is a sump screen for BSA unit-construction singles, made with a 5/16 inch hole. It sits in the oil pump area, catching debris in the sump before oil gets pulled back up into the pump and circulated through the engine. Catalog listings tie it to BSA singles, not Triumph twins, so don't reach for this one thinking it's a Triumph part.
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The screen shows up in oil pump and gearbox sprocket area figures in our records, which fits with where sump screens live on these engines - down low, doing quiet work nobody thinks about until the oil pickup gets clogged. Cheap insurance against that isn't a phrase Ed uses, but keeping the screen clean and intact matters more than its size would suggest.
Our catalog data only ties this to BSA unit singles across 1969-1970 appearances. If you're working on something outside that, call the shop and we'll confirm fitment before you order.
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