| Also known as | E7591 |
| Diagram | Fig. 3 — OIL PUMP AND RELEASE VALVE · ref 16 |
| Subsystem | engine bottom |
| Listed in parts books | 1969–1970, 1973–1974, 1976–1978 |
Spring
Oil pressure release valve spring for the oil pump assembly, part number 70-7591 (E7591).
This is the spring for the oil pressure release valve, part number 70-7591 (also listed as E7591 in older parts books). It lives inside the oil pump assembly, where it works against the release valve to keep oil pressure in check by holding the valve shut until pressure builds enough to open it.
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It shows up across the oil pump and release valve figures, alongside the release valve, manifold, and tappet parts, so it's a small piece but one that matters if the pump area is being rebuilt or if oil pressure has been acting up. Catalog listings for this part span 1969 through 1978.
If you're troubleshooting low or erratic oil pressure, a tired or broken release valve spring is a cheap thing to rule out before you start tearing into the pump body itself. Worth having on hand when you've got the timing cover or pump apart anyway.
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