Re: 1977 merc 1150 water pump question
Great advice on the peeing. Thanks! I got it fired up a little bit ago and had it running. It was peeing good at first, but then slowed to a trickle and water was coming from the square hole behind the pee tube?? THEN I noticed white gooey stringy like stuff coming out of the outlets on the lower unit. It appears to be the remnants of a spider's web who took up residence somewhere in the cooling system. F***ing great. So I shut 'er down for the day cuz it looks like rain any minute. (of course hard to tell with this crazy weather we're having this year.) Any advice on cleaning out the cooling system?
As for my carbs... I could not believe how filthy the fuel was in the bowls. It literally looked like mud and big chunks of rust and debri. I'm amazed it fired up at all before I rebuilt them, but it did for a couple seconds. I still can't get much rpm's out of it. I'm guessing 1500 tops, as I don't have the tach working yet. The throttle linkage doesn't "feel right" to me when I move it, so I guess that's where I'll start on that.
well not sure about coming from the square hole behind the pee tube? do you have the covers off? May have blown the pee tube off and running out there??? Pull the tube off the back of the head and blow compressed air in it and see if you can hear it at the lower unit? If you don't have air try a tip on your water hose and run water from top to bottom and see if it goes through. won't tell you if your impeller is bad but will let you know if stopped up. when it was peeing a small piece of trash may have broken loose and stopped up the tip if the pee tube? wouldn't take much to clog that tiny hole.
About your RPM's when you put the shift lever into full forward all the way down can you see if the butterfly's are opening all the way up. You can see the butterfly shafts on top of the carbs from the control box. also when you put the shift lever all the way down what appears to be the end of travel is not on mine it has about another inch to go. and that opens em up all the way. My tac don't work but revs way up there. and I guess you've probably already lubed all of you control cable ends at the motor? Mine were a little stiff.
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Now about the carbs on this engine. I pulled the top off the middle carb (the one pissing) and first thing I noticed was the front screw was loose. I went ahead and pulled the top and super clean inside. I guess someone rebuilt the carbs not too long ago. I pulled the float out and no restrictions and I mopped the gas out of the bowl and the sides of the bowl was slick and clean and the float looked new. I cleaned the needle seat and put back together and same thing. still pissing gas out the side jet. The gasket was cracked on one side so probably pulling air in and pushing gas out the side jet??? I'm guessing at this point. I am going to order new kits and do all three carbs. When I put it back together and tightened down the screw it did run alot smoother, but still pissing gas. So tomorrow is another day and I will see about ordering carb kits.
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And while I'm thinking about it, Don't remember if earlier we were talking about the water coming out anywhere besides the pisser when the motor is running, but when I had mine cranked a minute ago, I did notice water coming from the slots to the back of the motor behind where the muffs go on. Like a few inches behind there are a few slits in the housing and when running and reved water does spray out of there some. I think you asked about that.
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thanks for your help, I posted a reply earlier explaining all this and lost the reply, I guess cause I don't type fast enough to keep from getting logged out. Or maybe because I'm so long winded! : )