BMW MINI Oil Pump Side Crankshaft Seal
All Gen 1 petrol BMW MINI oil pump side crankshaft seals are extremely susceptible to leaking. If you think your MINI is using more oil than it should but cannot find a noticeable oil leak on the garage floor or driveway this is a serious contender for the likely culprit. Directly behind the crankshaft seal beneath the timing chain cover the MINI’s two oil pump gears are situated. When the car is in operation oil is forced into the back of the seal; if the seal does not hold up as it frequently doesn’t, oil then migrates its way past and eventually comes into contact with the crankshaft damper. The centrifugal force sprays the oil in every direction making it extremely difficult to find visual evidence of an oil leak. Most of the oil is distributed across the timing chain cover and surrounding areas before it drops onto the road while the vehicle is in motion. To diagnose this we recommend placing the MINI on a ramp and removing the right hand side plastic wheel arch liner, you will be able to see the tell tale signs of this yourself.