changing water pump

frwhlr38

Seaman
Joined
Aug 4, 2009
Messages
70
ok guys this motor a 50 hp 500 merc 1977, it has been sitting since 2000 inside of coarse, my ??? is does one needs to just change the impeller on the water pump or should one do the whole water pump, ive had the motor running and it runs super but am going to change the pump MANY THANKS:)
 

ENSIGN

Lieutenant Junior Grade
Joined
Jun 21, 2009
Messages
1,179
Re: changing water pump

Short cuts will bite you in the a#s change the whole thing!!
 

Texasmark

Supreme Mariner
Joined
Dec 20, 2005
Messages
14,780
Re: changing water pump

Agree. Get a kit, don't replace the whole thing per se. I feel sure that this is what ENSIGN meant. The kit has the impeller but also other gaskets, seals and may include another cover.

Be sure and pay attention to how things come out, the direction that the blades of the impeller are bent back and the copper water discharge tube as it is mounted in the top of the water pump and also the hole in the bottom of the power head where it inserts. When you go back together be sure and get it in the hole. Also o-rings and things on the crankshaft.

Also, put your shifter in R (carefully, don't force it without the engine running....twist the prop to get it to go in gear) before you split and don't turn the shift shaft while dismantled. This way when you go to reinstall it, you can rock the prop back and forth and it will move the driveshaft assisting in getting that spline and the spline on the bottom of your crankshaft to line up and engage. Remember, watch the water outlet tube and get her in the hole.

Mark
 
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