Re: 1974 75 hp chrysler water tube
went back to the lake, fished a few spots. last time i moved i putthe boat in forward and it started jumping in and out of gear and took off in reverse, so i shut it down ,trolled it to the trailer and took it home. the problem was the little brass shift dog broke and caused the problem. i took the lower unit off my spare engine, swapped the water pump impeller (only) out of the unit i was using into the the spare lower and put it back together. next day at the lake no more over heating problems. not quite sure what the problem is with the old lower, unless it has worn out plastic o-rings on the water pump housing, or a crack somewere that i cant find.