| Also known as | WW28570S |
| Diagram | Fig. 3 — OIL PUMP AND RELEASE VALVE · ref 13 |
| Subsystem | engine bottom |
| Listed in parts books | 1974, 1976–1980, 1983, 1985 |
OIL PRESSURE VALVE,T120/4
Oil pressure relief valve for the Triumph unit twin oil pump system, PN 71-3447.
This is the oil pressure relief valve for the Triumph unit twin engine, PN 71-3447, listed in the parts books under the OIL PUMP AND RELEASE VALVE figure. The description ties it to the T120/4 engine family. It works alongside the oil pump to bleed off excess pressure once the system builds past the point the engine needs, protecting the pump and oil lines from being overloaded.
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This number carries forward from two earlier factory numbers, 70-5896 and 71-2369, so if your parts book lists one of those instead of 71-3447, you're looking at the same physical valve. It also shows up under the WW28570S alternate number in some records. Catalog listings for this part span 1974 to 1985.
If you're chasing a leak or an oil pressure gauge that isn't reading right, this valve is one of the usual suspects worth checking or replacing. Give us a call if you want to confirm which version your engine takes before ordering.
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