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The Precision range of oil pumps from Mini Spares are all hand selected, component matched to exacting tolerances, then hand assembled. This ensures minimum end float and rotor clearance, maximising pump efficiency. The rotor type is a 4 into 5 configuration as per the standard steel backed pump.   This supplies more than enough oil for the Mini engine some 40% of which is dumped straight back into the sump via the pressure relief valve. A greater oil supply would only create a loss in power. Port design ensures minimal drain off when engine is not running to give instant oil pressure on restart and minimise pulsing at lower engine speeds.

All the pumps have multi hole fixings, so any pump can be fitted to any block. However a spacer would still be needed to fit a 1300cc type pump to a small bore block. No drilling and tapping of the block is needed. This is also useful when wanting to fit a star drive or spade drive pump to an ‘S’ block. Make sure that the pump retaining bolts do not bottom out before clamping the pump to the block. Any air leaks caused by using bolts that are too long will cause oil pressure loss, drain down and oil supply problems.

Despite thorough cleaning prior to assembly at the factory, it is essential to strip the pump down and reclean to ensure no contamination has occurred in transport. When dismantling, make note which way up the small chevron indents on the impellor are and ring and then reassemble them in the same way.

Once reassembled prime the pump, preferably with engine building lubricant as this is less likely to drain down before start up is effected. If not properly primed, oil pressure may not be obtained from sureflow pumps, whereas on the old original type it was not quite so critical.

Assemble the oil pump to the engine at the last minute after all timing gears are fitted and before fitting flywheel housing. Once the engine is fitted to the car, with spark plugs removed, spin engine over on starter motor in short bursts to pick up oil pressure before starting the engine.

Failure to comply with this would result in severe damage to the pump and engine bearings.

Article Date: Jan 30, 2000
Car Accociations: MINI,MORRIS,SPRITE,
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