Water pump HELP!!

[Plyliteblue]

Hi there.I have recently replaced my water pump on my 90 hp mercury late 1980's.The problem is when i put the lower unit back together the prop spins when in neutral! i have taken the lower unit off about 10 times already trying to correct it but nothing will work.How can i fix this??

thanks,

 

[Rudy Brown]

Re: Water pump HELP!!

When you say spin, do you mean turns forward or reverse when the engine is running on muffs? Like its in gear? Or do you mean it just barely turns when the engine idles on muffs?

 

[RadarRick]

Re: Water pump HELP!!

Another question - when the engine is off and in neutral, can you spin the prop freely by hand?

 

[kmarine]

Re: Water pump HELP!!

I usiually put shifter in foreward gear and shift fork in foreward gear on lower unit this allows you to turn the prop to allingn splines. This is how Iwas taught at the dealership where i used to work.

 

[Chris1956]

Re: Water pump HELP!!

You want to install the gearcase when it is in neutral. Make sure the control is in neutral as well. Turn the flywheel by hand to align driveshaft splines.

Prop should rachet when prop turned CW in forward. Prop should spin freely when in neutral. Prop should turn about 1/2 turn either way when in reverse.

 

[Plyliteblue]

Re: Water pump HELP!!

Hi guys.The prop spins freely in a clockwise movement but makes a clicking sound every half a turn or so.when i turn prop anticlockwise it is not free.The throttle shift is in neutral but when i start up the prop spins.Its like i need to recalibrate the shift linkage or something.

 

[Plyliteblue]

Re: Water pump HELP!!

So am i on the right path to say that the lower unit is in forward gear.so if i put it back on and have the control in forward it should work??

 

[RadarRick]

Re: Water pump HELP!!

I'm not sure about your specific model, but on many outboards, the prop will spin slowly in neutral. This is caused by the oil circulation in the lower unit.

 

[Plyliteblue]

Re: Water pump HELP!!

Hey guys finally got it going.All i did was use some plier's and made a half turn on the lower unit gearcase splin to obtain neutral.(prop free spining).All gears are fully functional and pumping good water now.Id like to thank all the help recieved in fixing this problem.

Thanks alot Tom from New zealand.