Mercury 3.9 HP, Identification & maint.

[Lt Bud W Eiser]

I recently inherited a 3.9 HP Mercury, there is not a serial # on it that I can Find. I disasembled it, cleaned etc, an started it. I have determined so far that it needs a water pump impeller and lower end seals.<br /><br />Can any one assist me with the following.<br />Id what year it is?<br />How do I remove the impeller?<br />Any other tips that a novice, may do to fix it up etc? <br /><br />I hope to use it to push a small flat bottom & or for manuvering a sail boat in & out of marina.

 

[corm]

Re: Mercury 3.9 HP, Identification & maint.

Hi,<br />THe Ser No is located between the thumb screws that hold the motor to the boat on a plate. There are 2 nuts holding the LU on 1 is in the front of the LU in a notch,the other is under the cavitation plate resessed in a hole above the prop. Put the motor in F gear before takeing the unit off. They made the motor all through the 60s. Nice little motors.<br />...have fun...corm