| Also known as | E3731 |
| Diagram | Fig. 3 — OIL PUMP AND RELEASE VALVE; INLET MANIFOLD · ref 2 |
| Subsystem | engine bottom |
| Listed in parts books | 1964–1966 |
Pump body
Oil pump body for the unit-construction Triumph engine, also known by its earlier factory number E3731.
70-3731 is the oil pump body for the unit-construction engine, the housing that the pump gears and plunger sit inside. It's listed in the parts books under the Oil Pump and Release Valve figures, alongside the inlet manifold on some pages, since the pump mounts near that area of the engine. The older factory reference for this same part is E3731, so if your parts book or an old invoice shows that number, it's the identical piece.
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This body is a Triumph part and shows up across catalog entries from 1964 through 1966. If the bore or gears inside are worn, oil pressure suffers, so a lot of folks replacing a tired pump start with checking the body itself for scoring. We don't have a model tie beyond what's shown in the catalog data, so confirm fitment against your own engine before ordering.
If you're rebuilding the oiling system, it's worth pulling the release valve and manifold at the same time to check the whole assembly rather than just swapping the body on its own.
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