1991 Merc. Force (50hp) water pump repair

[wayner7]

Hello,<br /><br />I am in the process of replacing the water pump and have removed the lower unit already.....the problem i am having is there is a bushing on the top half of the driveshaft that needs to be removed so the water pump housing and impeller can slide out.......how does one remove this bushing? and how does one put the bushing back?..<br /><br />Thanks for any help...<br />Wayne

 

[greatwhite866]

Re: 1991 Merc. Force (50hp) water pump repair

Just wondering if you found out how to accomplish this, or anyone has some advice?

Problem: I'm not getting any water to the engine. After a little research here, I've tried several things: removing the thermostat and housing, flushing the pipes with a hose, etc. Water seems to move through the system okay with the hose spraying straight up the inlet pipe, and from the thermo housing going out. But when I'm running the engine with the lower unit attached and muffs on, I'm not getting any water up to the thermostat.

I removed the lower unit and opened up the impeller housing. Although it doesn't seem all that worn, I assume this is the problem. However, I can't figure out how to remove the bushing at the top of the driveshaft (other than vising and whacking the crap out of it). Possibly it isn't designed to be removed and I should disassemble the lower unit? Seems like a lot of trouble to replace the impeller. Any help would be appreciated.

 

[BoaterDan]

Re: 1991 Merc. Force (50hp) water pump repair

Once you have the lower unit off, take the bolts off the housing at the lower end of the shaft (4) pull the shaft (impeller attach inside housing) up. Pull up the pump housing (impeller will go up with it) there is a pin in the shaft, pull the pin, then slide impeller, housing down off the shaft. Leave the bushing at the top alone. When you replace, turn shaft clockwise to insert back into lower unit.