| Also known as | 70.6595, E6595 |
| Diagram | Fig. 3 — OIL PUMP RELEASE VALVE AND OIL FILTER · ref 26 |
| Subsystem | engine bottom |
| Listed in parts books | 1969–1971, 1973–1974 |
PRES RELIEF SS 3CYL 75PSI
Oil pressure relief valve set at 75 PSI for the Triumph three-cylinder engine, PN 70-6595.
This is the oil pressure relief valve for the three-cylinder Triumph triples, part number 70-6595, set to release at 75 PSI. It shows up in the parts book figures covering the oil pump, release valve, oil filter, and inner primary cover, so it lives in the lubrication circuit down in the bottom end of the engine.
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The job of a relief valve like this is straightforward: once oil pressure builds past its rated setting, the valve opens and bleeds pressure off so the pump and oil lines aren't working against more pressure than the system is built to handle. This one is stamped for a 75 PSI setting and identified specifically for the 3-cylinder engine, so it's not a part to swap in from a twin.
You'll also see this part number written as 70.6595 or E6595 in older listings — same physical part, just different number formats from different eras of the parts books. Appears across catalog listings from 1969 through 1974.
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