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Catalina/Capri 25/250 Sailor's Forums

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Waterpump Housing Question

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davidbloodworth
1st Mate

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USA
78 Posts

Initially Posted - 06/25/2012 : 19:26:42

I opened up my lower unit to check the impeller on my 83 Honda 7.5 HP outboard. Impeller is fine but when I put it back together and poured water into the water outlet on the pump it filled up the housing above the drive shaft. I have attached a photo that shows light coming through the hole. Should this hole be there? It seems to me that it would reduce the water pressure needed to push the water up the pipe. Thoughts??

David B.
'84 C25 TR/FK #4301 "Synchronicity"
'70 18' Interlake
'78 14' Dolphin Sr
Lubbock, TX

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davidbloodworth
1st Mate

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USA
78 Posts

Response Posted - 06/28/2012 : 06:46:35

Is there really no one out there that can tell me if this hole is supposed to be in the water pump housing??

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Davy J
Master Marine Consultant

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USA
1511 Posts

Response Posted - 06/28/2012 : 08:29:01

You might get an answer over here:

http://forums.iboats.com/forumdisplay.php?f=29

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OLarryR
Master Marine Consultant

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USA
3442 Posts

Response Posted - 06/28/2012 : 08:53:17

I think what you are referring to is the inlet vs the outlet to the water pump impeller. The water is discharged off of the impeller thru the narrow black hose. When you put the outboard together, there is a tube that fits into that narroww black hose that allows just a wee bit of water to slide past it's bushing the bulk of the water in the narrow black hose travels up the tube to cool the engine.

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davidbloodworth
1st Mate

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USA
78 Posts

Response Posted - 06/28/2012 : 19:51:43

I am talking about the small hole you can see light coming through at the end of the arrow. The housing is out of the motor with a piece of cardboard covering up the hole where the drive shaft comes through and sitting on top of my flashlight. When the pump is together and i pour water into the outlet the water comes out of that hole and fills that space. I did post this on the iboat site also. Thanks for that idea.

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OLarryR
Master Marine Consultant

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USA
3442 Posts

Response Posted - 06/29/2012 : 04:07:45

Now I see what you are talking about and I have no clue regarding it. I checked my Honda shop manual but it does not show that area to any great detail and no mention of a hole or not.

I am not sure if it would reduce water pressure or not but maybe it is designed that way. It looks like a uniform hole and not a crack, etc. As long as you re-install everything that you removed, testing the outboard, you should get good water flow exiting. If that's the case, then I would think it is a non-issue. Also, if you had a hole in the narrow black hose, then that to me would be a bigger issue since the narrower black hose is definitely the discharge from the impeller and that water discharge needs to maintain flow up to the engine for cooling. That hole you are referring to does not seem to be on the water discharge end.

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dmpilc
Master Marine Consultant

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USA
4593 Posts

Response Posted - 06/29/2012 : 09:03:57

Is that not a drain hole for water to exit the pump when you lift the motor out of the water. When you reinstall the pump, is that hole facing the front or back? Just asking since I've never changed out an impeller.

Edited by - dmpilc on 06/29/2012 09:04:39

OLarryR
Master Marine Consultant

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USA
3442 Posts

Response Posted - 06/29/2012 : 09:33:42

David, that is a good point regarding it being a drain hole. I could see the importance of that since I sail year-round and there are those days when the boat is dockside in below freezing conditions. I normally keep my outboard in the raised , vertical (not tilt position). Without a drain hole in that housing where the shaft is located, water in there could freeze, expand and potentially crack the housing. Your posting got me thinking about this.

Edited by - OLarryR on 06/29/2012 09:34:54

davidbloodworth
1st Mate

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USA
78 Posts

Response Posted - 06/29/2012 : 12:46:03

The hole is on the prop side of the housing. I hate to ask repair people that fix things for a living free advice but I did. He said the hole is not a problem. He also said that when I put it back together to put the impeller on the drive shaft and as I pushed the housing back down to turn the drive shaft clockwise and the impeller fins would be oriented in the right direction. He told me to put the motor back together and run it in my water container and use an air compressor to blow air up the telltale. Could be something as small as a spider clogging the water path. He said the motor should run at about 140 degrees and I could put my hand on the cylinder head and it could run as long as the temperature was comfortable to the touch.

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