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Merc 1150 water pump?

S

stimpy451

New member
My Predictor runs GREAT when it's cold. It idles in gear, holeshots are snappy, etc. After longer trips, it won't idle at all and stalls. Then it's a total bitch to start. So much that yesterday I got stuck on North Higgins nad had to have a tow back to South Shore. I got it back home and it fired right up after I threw a charge on the battery [I ran it down trying to get it started].

Now the scary part [I think]: on the trailer with the garden hose hooked up and earmuffs on the water inlets, I don't get a good steady stream out of the telltale hole. There isn't any water coming out at idle at all. The only time a solid stream is present is above 3500 RPM. Have I been overheating my poor little engine? My crappy Chilton manual says there should be a steady stream at 1300 RPM.

If so, I need to do the water pump. Getting the lower unit off looks pretty easy, is this something I can do without having major headaches?

Thanks for any info,

Pete
 
My Predictor runs GREAT when it's cold. It idles in gear, holeshots are snappy, etc. After longer trips, it won't idle at all and stalls. Then it's a total bitch to start. So much that yesterday I got stuck on North Higgins nad had to have a tow back to South Shore. I got it back home and it fired right up after I threw a charge on the battery [I ran it down trying to get it started].

Now the scary part [I think]: on the trailer with the garden hose hooked up and earmuffs on the water inlets, I don't get a good steady stream out of the telltale hole. There isn't any water coming out at idle at all. The only time a solid stream is present is above 3500 RPM. Have I been overheating my poor little engine? My crappy Chilton manual says there should be a steady stream at 1300 RPM.

If so, I need to do the water pump. Getting the lower unit off looks pretty easy, is this something I can do without having major headaches?

Thanks for any info,

Pete
 
This is no problem for the average guy. Order up a water pump kit, including the housing. It will come with gaskets, new devider plate, impeller, and key.
If I remember right there about about 8 bolts/nuts holding the lower on.
Trim the motor up a bit, remove the mouting bolts and nuts. It may take a tap or too with a rubber mallet. The lower will start to slide off. Watch you feet as it is not lite. The drive shaft and shift shaft will come out with the lower. You will have to have room to lower/back up a bit better than 20".
You will see the water pump housing in the lower unit. Take care in getting the screws out as they sometimes are a bear to get out. Take it a part replace the parts and put it back together the same way. There will be a new plastic guid that goes on the outlet. There is a tube inside the mid that fits into this. The fun part is getting it all back together. You have to line up the driveshaft, shift shaft, and water pump outlet. Take you time ans don't force it. Once it fits tight on the mid start putting the mouthing hardware back in. 2 people makes the job a bit easer to do.
 
doesn't the engine have to be in forward gear for lower unit removal? i can't remeber for sure.
 
Putting the lower unit in gear let’s you turn the in input shaft with the prop shaft. This makes it a lot easier to put back together by lining up the input shaft splines with the end of the crankshaft. Check the rotation of the prop in forward gear before you take it apart, this is the direction of rotation you want to turn the prop shaft while putting it back together so you don’t flip the impeller vanes.

Put some grease on the splines on the input shaft, the shift shaft splines, both ends of the water tube and lightly grease the water pump impeller.

If you have a vise put the lower unit’s skeg between 2 blocks of wood and use the vise as a holding fixture to do the water pump.

1984 Predictor 1968 Mercury 1250 I-6 125 HP
 
Followed the manual, piece of cake. The impeller vanes were hardened in a permanent curl. Put it all back together and now have a steady stream out of the telltale hole at idle. Yay, me.
 
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