Question about Mercury Mark 30 Hipo Outboard Motor (Mercury Marine)

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

I have a 1977 9.8 hp Mecury that needs the water pump impeller replaced.

Posted by Melvin Jackson on

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william moore

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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

Posted on Jul 29, 2012

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Tefa222

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SOURCE: 80 hp mercury outboard starts and runs as long as you hold the key in the start possition. when you let the key go to the run possition it shuts off any help

Contacts in your ignition switch are corroded. Some can be cleaned but some just have to be replaced at times.

Posted on May 22, 2012

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1 Answer

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The drive shaft going to the lower unit through the water pump turns clock wise. If installing a new impeller, put a little liquid dish soap on it to lube it. While pushing the pump housing down, turn the drive shaft clock wise and this will seat the impeller in the right direction. Hope this helps.

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next remove rear electrical panel on the motor. Using s 7/16" wrend, hold the end of the motor shaft by the electrical end (where you removed the cover) while turning the impeller counter clockwise (note: some impellers have an impeller screw inside which unthreads CLOCKWISE) untill impeller is off. Replace carbon shaft seal inside. Reverse and prime and then restore power and start.

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You will need to pull the front of the pump off then unscrew the impeller. The impeller will be set on the shaft and will take some force to break free. Hold ing the back of the shaft and using water pump pliers on the face of the impeller will usually work but sometimes I will wedge a screwdriver in the fin of the impeller and hit it sharply (not hard) with a hammer to break it free. Then the housing will just pull free of the motor. When replaceing, the impeller just goes on hand tight. Hope this helps and good luck.

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