| Also known as | S1906 |
| Diagram | Fig. 3 — OIL PUMP AND RELEASE VALVE · ref 12 |
| Subsystem | engine bottom |
| Listed in parts books | 1969–1971, 1974, 1976–1979 |
NUT OIL PUMP FIXING
Fixing nut that secures the oil pump to the timing chest on unit-construction Triumph twins, 1/4 inch 28 TPI UNF thread.
This is the fixing nut that holds the oil pump to the timing chest on the unit-construction Triumph twins covered in these catalogs. The oil pump bolts up from inside the timing case, and this nut is what keeps that fastening secure so the pump stays seated and the internal oil galleries stay sealed against leaks.
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Catalogs list it under the OIL PUMP, RELEASE VALVE, MANIFOLD AND TAPPETS figure, and it also shows up under the older S1906 number if you're working from an earlier parts book. It's a small, easy-to-overlook item, but a stripped or worn one can let the pump work loose over time, so it's worth checking condition when the timing cover is off.
Thread spec on this one is a 1/4 inch 28 TPI UNF, with a beveled face to seat correctly against the pump body. Worth keeping a spare or two on hand since it's a common item to lose track of during a strip-down.
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