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#1
03-20-2010, 07:23 PM
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Re: Merc 115 Water Pump Question
Hey there quick question... Can you tell me if the impeller needs to be seated into its housing with the fins directionally correct? I'm not sure what direction the drive shaft turns....
Basically I'm wondering if the fins will self correct to their correct position after firing up the motor. Tx!
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1988 18' Seacraft 1988 Mercury 115 
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#2
03-20-2010, 08:42 PM
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Re: Merc 115 Water Pump Question
Seat the impeller by twisting the driveshaft clockwise while seating the impeller housing. If you get it backwards, the vanes MAY self correct, or may not, and then shortly thereafter fatigue and break, sending little pieces of rubber to clog your water jacket and over heat your motor costing you lots and lots of money and frustration.
If you're not sure if you seated it correctly, by all means, take it apart and do it again. 
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Common Sense is learning from your mistakes. Wisdom is learning from the other guy's mistakes. Fr. Frank says: Jesus liked fishing, too. He even walked on water to get to the boat! Currently without a SeaCraft  (2) Pompano 12' fishing kayaks '73 Cobia 18' prototype "Casting Skiff", 70hp Mercury
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#3
03-20-2010, 08:52 PM
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Re: Merc 115 Water Pump Question
Thank you! Seemed to work well - the unit has been put back together nicely. How do you know the fins of the impeller are correct however? I lightly greased the impeller cup and after having put it back together I can turn the drive shaft with one hand but its not easy.
Funny I bought the official Merc manual for this Straight 6 motor thinking this procedure would be included. Nope! Again thanks for your input - very much appreciated as its obvious you know what your talking about!
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1988 18' Seacraft 1988 Mercury 115
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