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Old 04-14-2008, 08:40 PM
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Hurley
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Cool Raw Water Pump Hose Connections
Anyone know which connection goes to the suction and which goes to discharge? Its a merc raw water pump with an 1-1/4 hose connection top and bottom. Should be normal engine roation. Its on a 1995 Top Gun. I should have taken a picture prior to pulling motors.

Any help is appreciated.
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Old 04-14-2008, 08:49 PM
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The one next to the engine block is the suction, or the hardest one to get to.
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Old 04-14-2008, 09:15 PM
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I would look at the outlets on the pumps just to make sure .......should say "in" for LH rotation and "out" for RH rotation ... your motor should be LH rotation ....its stamped on the back of the pump ...
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Old 04-14-2008, 09:40 PM
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Bottom hose is the suction.
Attached Thumbnails Raw Water Pump Hose Connections-dsc02646.jpg  
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Old 04-14-2008, 10:30 PM
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Originally Posted by Noise Pollution
Bottom hose is the suction.
Suck low - blow high. Makes sense to me. Thanks.
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Old 04-14-2008, 10:31 PM
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Originally Posted by HighPriority
The one next to the engine block is the suction, or the hardest one to get to.
Now I'm confused. Are you saying upper is suction?
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Old 04-14-2008, 10:33 PM
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Originally Posted by offthefront
I would look at the outlets on the pumps just to make sure .......should say "in" for LH rotation and "out" for RH rotation ... your motor should be LH rotation ....its stamped on the back of the pump ...
Thanks for the info. I'll double check. Just need a flash light to read the lettering.

Makes sense how Noise Pollution stated.
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Old 04-15-2008, 06:55 AM
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With the pump mounted the connections are just about vertical. The top will go to the oil cooler and the bottom back to the drive.
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Old 04-15-2008, 09:26 AM
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Originally Posted by Noise Pollution
With the pump mounted the connections are just about vertical. The top will go to the oil cooler and the bottom back to the drive.
Ditto.
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