| Also known as | 70-9421E, E9421 |
| Diagram | Fig. 3 — OIL PUMP AND RELEASE VALVE · ref 1 |
| Subsystem | engine bottom |
| Listed in parts books | 1970–1971, 1974, 1976–1979 |
Oil Pump
Oil pump for Triumph unit-construction twins, part number 70-9421, paired with the release valve and oil manifold in the lubrication system.
This is the oil pump for Triumph's unit-construction twins, part number 70-9421 (also seen as 70-9421E or E9421 in older listings). It shows up in the parts books under the OIL PUMP AND RELEASE VALVE figure, along with the fuller listing that groups it with the release valve, manifold, and tappets, so it's a core piece of the lubrication system rather than an add-on accessory.
Read more
The oil pump is what keeps oil moving from the tank through the engine, feeding the bearings and other wearing surfaces under pressure. It works alongside the release valve, which is there to regulate that pressure, and the manifold that routes oil to where it needs to go. Given how central this component is to keeping the motor alive, it's not the kind of part you want to guess on if you're unsure of condition or fit.
Our catalog record spans appearances from 1970 into 1979 across several listings, which tells you this pump saw a long run in Triumph's unit twin lineup, but it doesn't pin down which specific models beyond that. If you're not sure this is the right oil pump for what's on your bench, give the shop a call and we'll sort it out before you order.
Sorry if we got something wrong here. If you think this information isn't correct, .