T
Well I am having the sticking oil pump issue on my M8 and so I got a old pump from a buddy and tore it apart to see whats inside and this is what I have found. The oil pump is basicly a simple piston pump that increases oil displacment as the rotation is increased (rpm increase) but also has a set stroke for every revolution that is varied by the lever. It varies only from idle (least amount of oil) to about 1/3 of the lever travel (full stroke) and then any lever movment above that point does nothing to change the stroke. So if you fallow me so far the m8 is at full stroke and when the lever returns to idle the outer spring (the one you see) cannot overcome the pressure of the inner spring and the pump lever is stuck at about 1/3. You can move the lever to idle and the pressure you feel is the cam pushing on the inner spring along with the oil pushing against the banjo metering valves. Cure...Heavier spring or tying the lever together....Hope this helps someone....Garry