| Diagram | Fig. 6 — OIL PUMP, GEARBOX SPROCKET · ref 6 |
| Subsystem | gearbox |
| Listed in parts books | 1969–1970 |
BSA Washer, oil release valve to crankcase
Sealing washer fitted between the oil pressure release valve and the crankcase.
70-9737 is a washer that seats between the oil pressure release valve and the crankcase. It's a small sealing piece, but it does the job of keeping oil where it belongs at that joint instead of seeping out around the valve body.
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The catalog places this one in the oil pump and gearbox sprocket area, so it's tied to the lubrication system rather than being a generic hardware washer. Our records show it appearing in 1970 catalog listings, but we don't have a specific model tied to it beyond that.
It's cheap to overlook and easy to lose track of when you've got a valve apart on the bench, so if you're pulling the release valve for a look, worth grabbing a fresh one rather than reusing the old one if it's at all deformed.
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