I recently tested my oil pump following a procedure given in a repair manual. It involves running the engine on premixed oil and letting the output from the oil pump run into a graduated cylinder. As the engine runs, the person watches the motion of the piston, counts the "strokes" of the oil pump, and measures the amount of fluid pumped into the cylinder.
It gave a spec that for every 200 pump strokes, 3.5-4.3 ml of oil is supposed to be pumped, but it doesn't specify whether a stroke is counted only when the piston pushes out oil, as in every other directional stroke of the piston, or if a stroke is every single directional motion of the piston. I ask because I counted 200 single directional strokes of the piston and got about half the oil specified.
If the manual meant for me to count 200 strokes where oil is pushed, essentially 200 rotations of the crank or 400 single directional strokes, the oil output would have been in accordance with the factory specification. Does anyone know where I can have this question answered?
It gave a spec that for every 200 pump strokes, 3.5-4.3 ml of oil is supposed to be pumped, but it doesn't specify whether a stroke is counted only when the piston pushes out oil, as in every other directional stroke of the piston, or if a stroke is every single directional motion of the piston. I ask because I counted 200 single directional strokes of the piston and got about half the oil specified.
If the manual meant for me to count 200 strokes where oil is pushed, essentially 200 rotations of the crank or 400 single directional strokes, the oil output would have been in accordance with the factory specification. Does anyone know where I can have this question answered?