CLASSIC MINI 1275cc SLOT DRIVE OIL PUMP FOR A+ ENGINES GLP138 INC. GASKET 5C5
Classic Mini Oil Pump 1275 A+ Slot Drive
The slot drive oil pump has been the factory standard for many years. The evolution of the pump in production was started with the pin drive that is most common in early small bore motors. These pumps have a fork on the drive side to engage the pin in the end of the camshaft. Many 1275 engines were then given star drive pumps. The pump has a splined shaft that engages a star drive that fits into the camshaft. The latest slot drive pump has a screwdriver end that engages a slot on the end of the camshaft. Almost every new or reground camshaft now available from the UK is only available in slot drive configuration.
Oil pumps in the Mini should be the most replaced item inside the engine. NEVER open the motor without replacing the pump. In these motors the pump is asked to suck the oil directly from the sump and send it to the oil filter. Thus the pump only sees unfiltered oil and does wear out quickly relative to the rest of the motor.