I have a mercruiser 140 with an alpha 1 drive. i seperated the loer housing to changet the water pump and impeller and walaa this flat on one side and round on the other side piece fell out. i have no idea where it goes or if its even important. i've looked at it for 2hrs and still can't seem to find where it goes. the piece also has 5 holes in it on the round side. any help would be great.
wood.
wood.