| Also known as | AA09A, E495 |
| Diagram | Fig. 3 — OIL PUMP AND RELEASE VALVE · ref 5 |
| Subsystem | engine bottom |
| Listed in parts books | 1960–1962, 1964–1971, 1974, 1976–1980, 1983, 1985 |
OIL PUMP DRIVE BLOCK
The sliding drive block that operates the oil pump plunger inside the timing chest of Triumph twins.
This is the oil pump drive block, part number 70-0495, also cataloged under AA09A and E495. It shows up across the oil pump and release valve figures in Triumph's parts books, right alongside the inlet manifold and tappets, so it lives down in the timing chest area where the pump gets its motion.
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The drive block is the small slider piece that transfers drive from the timing gear or cam to the oil pump plunger, keeping the pump stroking so oil actually moves through the engine. It's a wear item by nature -- it's metal riding against metal every time the engine turns over, so it's worth a look when you've got the timing cover off, especially if oil pressure has been acting up.
The catalog shows this part appearing across a long stretch of production, so it was used broadly across Triumph's twin-cylinder engines over the years. Bring your parts book number or the engine details to the counter and we'll help you match it up before you order.
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