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Water pump is only pumping out a trickle
markvm	#1  Posted on 09/11/10 - 3:30 PM
Member Posts: 22 Comments: 0 Joined: 09/10/10	I have a 69 Merc 350 and the engine's water pump is only sending out a trickle of water. I got a new pump at the beginning of the season, so I'm surprised. It never shot out with a lot of pressure, but it has definitely reduced. Any ideas?
CES	#2  Posted on 09/11/10 - 3:39 PM
Member Personal Page Photo Albums Project Albums Posts: 2681 Comments: 7 Joined: 04/27/07	If you're sure your water pump is in good condition, I'd take a look at the pee hole. I'd run a wire down it and try to clear whatever is blocking it. Sometimes you may pick up some debris if running in muddy water or very shallow water. Cliff 1966 13' Sport with a 1993 40hp Yamaha 2 Smoker
DWinter	#3  Posted on 09/11/10 - 3:40 PM
Member Personal Page Posts: 252 Comments: 0 Joined: 01/02/10	It doesn't take much to ruin one. 15 seconds without water can do it. Or your flush attachment may be loose. The most common way to degrade one in a seaon is running in shallow sandy water. Duane G Winter 1984 BW Sport 15 Center Console
MW	#4  Posted on 09/12/10 - 1:05 AM
Member Personal Page Posts: 1827 Comments: 10 Joined: 01/08/06	Was it a full water pump change out kit, or just the impeller ? Is the engine running hot ? Matt
HarleyFXDL	#5  Posted on 09/12/10 - 5:10 AM
Member Personal Page Project Albums Posts: 917 Comments: 30 Joined: 07/24/07	Make sure there is no water leak before the hose on the engine. Kevin 1988 11' Super Sport, 1987 Johnson 15hp. If you think education is expensive, try ignorance "Vegetarian - old Indian word for bad fisherman."
markvm	#6  Posted on 09/12/10 - 5:29 AM
Member Posts: 22 Comments: 0 Joined: 09/10/10	Thanks, It was a complete new pump, and the hose looks new as well. I can't really tell if it's running hot because I don't have a temperature gauge. Is there another way to tell. I also ran it with the Cowling off and didn't see anywater coming out anywhere aside the pee hole.
DWinter	#7  Posted on 09/12/10 - 6:09 AM
Member Personal Page Posts: 252 Comments: 0 Joined: 01/02/10	If you have an infrared thermometer gun, shoot the thermostat housing, it should by around 140 and see the temp drop when it opens. Duane G Winter 1984 BW Sport 15 Center Console
MW	#8  Posted on 09/12/10 - 6:17 AM
Member Personal Page Posts: 1827 Comments: 10 Joined: 01/08/06	You should be able to hold your finger on the engine head (next to the spark plug) for a "1-2-3" second count before it get's too hot and you have to pull your hand away. It may be running "Cool" and just the "Tell Tale" is clogged. You need to determine if the cooling sysytem is working first, try the "Finger" test. Matt
markvm	#9  Posted on 09/12/10 - 7:01 AM
Member Posts: 22 Comments: 0 Joined: 09/10/10	Thanks Guys, pumping strong now. Must have been clogged, because I stuck a wire in the peehole and it's fixed. I had hit a sandbar last week, so I imagine that was the cause.
kb5xg	#10  Posted on 09/25/10 - 9:24 PM
Member Personal Page Posts: 30 Comments: 0 Joined: 09/13/10	I have a 2005 mercury 50 on my pontoon, and I have to clean the p-hole every outing, seems the mud-dobber wasps, love to try to build a nest inside the hole.