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Posted on Jun 24, 2009
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Changing a water pump on a 1996 15 horse mercury outboard motor

When unbolting lower end it will only move a inch and a half and stop what am i missing?

  • Anonymous May 11, 2010

    your linkage needs to be un bolted it is in the rear of the motor it should be a 1/4 inch thick piece of tubing with 2 nuts make sure to mark them because they will need to go the same or the engine will not shift

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Dennis Sharp

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  • Expert 154 Answers
  • Posted on Aug 03, 2009
Dennis Sharp
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Joined: Jul 31, 2009
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You need to unhook shift rod above at engine

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1977 9.8 hp Mercury Outboard Motor Serrial # 4605112, it's an electric start with a short shaft

put it in forward gear. Drop the lower off by releasing the bolts and nuts holding it holding the lower on. (one is hiding under the back pick up screen)- some models had a plug in the back top of the exhaust/intermediate housing hiding an allen head bolt pointing down.

Once released, put a protector in a vise and clamp the lower to the bench.

2 screws or bolts will hold the water pump cover on. (the drive shaft runs thru it) Clean the carbon and rust off the drive shaft will allow the pump housing and impeller off the lower. Retrieve the funny looking key drive which runs the pump.

Inspect the shaft, the lower unit oil for water. and find all the pieces of the water pump impeller which may have gone places they shouldn't have.- including the outlet tube from the power head. Check this by putting a tube on the end and blowing- you should hear and feel the pressure in the exhaust and tell tale hole.

Now take the model number , the old pump parts to the marina for a replacement. Do a side by side comparison at the marina so you get the right stuff. Check the inside drive of the rubber impeller and see if they are exactly the same.

NOW- put the new wear plate / gaskets and drive key on, hold in place with grease. Slide the impeller on the key and spin the drive in both directions to be sure it has the impeller and will securely turn it.

Put grease in the cup of the pump housing to prevent dry start and help seat the impeller blades. Spin the shaft as you lower the housing in the pump so the blades all face in the right direction (clockwise). Screw in the bolts. Grease up the seal the watertube goes in and the spline end of the drive shaft.

Up the hole it all goes, now you only have to spline the shifter (it hasn't moved has it?) The drive shaft and the water tube all at the same time.

Check the shifter for correct position and bolt it down
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