Re: Mercury Model and Year ID

[chinewalker]

The earlier 6/7.5 and 9.8 hp twins (as many of the Mercs of that era) had issues with rusting lower unit shafts that allowed water to enter. Worst was the driveshaft, directly below the water pump as that would puddle a bit of water and then just sit. Mercury was very late to the stainless shaft game, as they made the switch in the mid 1970s.