1960 14 hp twin elgin I tuned it up it runs like a top,need to know where the intake port for water is, my mufflers failed to supply water,noticed vent above the prop opened it but can't tell from looking is this the intake,do I need to submerse the lower end to check impeller,the holes on the starboard side of the lower end unit look to small to take in cooling water look more like speedo holes can anyone tell me where to locate the impeller ?