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Old 08-18-2019, 10:29 PM
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Default Need help with my 50hp boat outboard

Hi guys, Iím having a problem pinpointing the issue with my 1992 2stroke Nissan 50hp tiller motor. Iím not getting water up to the top and out the drain hose. I changed out the impeller but still no water. What happens after the impeller? Does the water continue up the water pipe into the head and then expelled out the drain? I had help with someone knowledgeable about impellers help me change that, so letís assume thatís not the problem.

What else could be wrong. The water pump system looks relatively simple, what am I missing?

Thanks,

Dan
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Old 08-19-2019, 12:25 AM
petew petew is offline
 
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Weeds pluging the water channels ? Try a reverse flush with a hose to clear the water jackets and passages.

Last edited by petew; 08-19-2019 at 12:30 AM.
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Old 08-19-2019, 12:32 AM
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Thanks for the reply. We tried that and had water dribbling out the bottom intake.

Dan
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Old 08-19-2019, 12:36 AM
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Quote:
Originally Posted by Pinhead View Post
Thanks for the reply. We tried that and had water dribbling out the bottom intake.

Dan
There should be more than a dribble I would think. The only thing to do is flush and clear the passages. Does it have a thermostat? if so it can be pluged. You have to open the passages . Are you sure the impeller drive is not also broken?
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Old 08-19-2019, 12:40 AM
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Looked at the thermostat, thought it would work regardless. Am I wrong?
New impeller in and that part I believe to be good.
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Old 08-19-2019, 12:54 AM
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If the thermostat is stuck closed it won't flow, , and it also won't open until the motor is hot.

If it was mine I would pull the thermostat, test it in a pot of boiling water , or over a candle to make sure it opens when hot or just replace it without testing it. While you have it out do some flushing to make sure there isn't any restrictions from weeds,sand,or old impeller pieces.
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Old 08-19-2019, 04:40 AM
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Yup go thermostat.....if crap got up there it will act up....pull, clean, inspect.....replace if suspect....
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Old 08-19-2019, 04:48 AM
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Pull the thermostat and reassemble, run like that and see if you have water. If you do thermostat is faulty.
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  #9  
Old 08-19-2019, 05:06 AM
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Half Pickereled Half Pickereled is offline
 
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Default Need help with my 50hp boat outboard

Quote:
Originally Posted by Pinhead View Post
Looked at the thermostat, thought it would work regardless. Am I wrong?

New impeller in and that part I believe to be good.


Not necessarily, some do and some donít have a steady tell tale stream...old v4 Evinrudes will have a steady stream no matter what. But for example a Mariner 15 hp will only flow when the thermostat is open so itís intermittent and can make a grown man faint if heís not aware of it.

If you have access to a temperature gun.... run it and zap all around the water jackets and see what temp your running at.
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Old 08-19-2019, 07:51 AM
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Are you sure you have the water line from the pump properly connected to the one that goes to the powerhead? They can be tricky to line up sometimes when you are re attaching the lower unit.
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Old 08-19-2019, 09:35 AM
barbless barbless is offline
 
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A couple times I've had to push a wire in the pee hole line cause it got blocked by some crap in the water. Only takes one day of sitting for it to plug. If you can get at it from both ends that's a bonus. I blame it on thick algae blooms. Have had to do my 150 2 stroke and the 8 hp kicker. Now when I get home I run the clean water through and flush both clean. Try cleaning that line out in the middle of a wavy lake
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Old 08-19-2019, 01:20 PM
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Thanks for the replies guys. Iím going to try some of your suggestions, Iíll let you know how I make out. There may be others that could benefit from this thread.

Dan
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Old 08-19-2019, 02:33 PM
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Ok, verified by hot water the thermostat is working. I guess it could be intermittent but I opened and closed it a few times and it worked everytime. I think the next step is to take the lower leg back off and check the water pipe physically for any obstructions.

Dan
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Old 08-19-2019, 02:48 PM
bagwan bagwan is offline
 
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When you have it opened up again blast some air through the water pipe. I had a spider nest in a smaller engine and that was the only direction I could blow out the obstruction. Hopefully its just the pipe not lined up.
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Old 08-19-2019, 03:00 PM
petew petew is offline
 
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Quote:
Originally Posted by Pinhead View Post
Ok, verified by hot water the thermostat is working. I guess it could be intermittent but I opened and closed it a few times and it worked everytime. I think the next step is to take the lower leg back off and check the water pipe physically for any obstructions.

Dan
That's one thing eliminated. It is entirely possible that all is good. With the thermostat closed on a cold engine only a trickle of water gets past. Usualy the thermostat has a small hole in it so the heads are not dry. Can you run it at idle in a drum of water with the thermostat removed ? or run it with the thermostat in , let it heat up to operating temp, and see what flows? If so just monitor the temp and don't let it overheat.

Good luck.
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Old 08-21-2019, 06:15 PM
barbless barbless is offline
 
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From what I've heard you don't want to run too long without water coming out where it's supposed to. That could cause you another whole world of grief. The water line connected in the leg might be. Some can be tricky to line up. I only know from talking to marine mechanic and research.
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  #17  
Old 08-24-2019, 02:19 AM
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Yes, it can be tricky to line those up. Still working through this issue. I thought I had it figured out yesterday but it turned out that I had not lined up the water pipe with the lower leg right. Iíll be back at it tomorrow. I must have taken the lower leg off 12-15 times now. You would think Iíd learned by now to make sure itís lined up. But if Iím working alone it can be tough. Not only must the water pipe line up but so must the gear shifter and main propeller shaft.

Thanks for the suggestions.

Dan
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  #18  
Old 08-24-2019, 08:10 AM
barbless barbless is offline
 
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I did see a good video a while ago but don't remember what site. There are some good ones out there, just have to find the right one. I remember the guy talking about how tricky it can be and he gave some good hints on how to do it. Good luck. With a few choice words it usually works.
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Old 08-24-2019, 08:29 AM
barbless barbless is offline
 
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Ok found one that might help. Go to your search bar ( Google or Bing ) and put in " how to line up lower leg on outboard after replacing impeller" when it comes up pick the youtube video done by Dangar Marine. This could help cause he also does it by himself. Hope it works for ya
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  #20  
Old 08-24-2019, 02:20 PM
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Ok, now it is working. Took the lower leg off and carefully put it back on. Ran it for 10 mins or so fine. Iím running it in a garbage can. But, when the water got below the ant ventilation plate the upper water stopped. I topped off the can and everything is good again. Any ideas why ??

Dan
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  #21  
Old 08-24-2019, 04:06 PM
barbless barbless is offline
 
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In a garbage can could be too much cavitation. 45 gallon drum better but hard to put a 50hp in if motor not on a hoist. That's what I use for my 8 horse kicker. How about hooking up the muffs and the garden hose. I use that for my 150 2 stroke. They make single side and double side feed of water. If you got all hooked into place you should be good to go. Try the muffs. Cheap to buy
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  #22  
Old 09-02-2019, 07:16 PM
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Got it finished. Just a matter of lining everything up well. Even though it took me a bit to figure it out this is a job the average boater with a little mechanical experience can handle.

Good luck, thanks for the help AO.

Dan
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