drain all of the engine oil out of it, pull the intermidiate shaft, put 3 quarts of diesel fuel into the crank case..using your oil pump primer spin the oil pump counter clockwise to give the engine oil pressure then quickly reverse the drill to send the debris from the screen out of it, do this several times then drain the diesel fuel into a very clean pan then dump the fuel thru a paint filter back into the jug and repeat process and look into the paint filter to see what kind of debris, if you cant see any debris put a finger down in there and see if it feels kid of like a jelly substance almost clear looking but with fiber in it
