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Author Topic:   Water pump impeller / direction of installation
JOHN W MAYO posted 03-28-2004 12:47 AM ET (US)   Profile for JOHN W MAYO   Send Email to JOHN W MAYO  
I just installed a new water pump impeller on a Merc 150hp 1500. I just realized I am not sure if I bent the impeller blades in the correct direction during the installation. I know it is 50/50 if I got it in the right directions. Does the direction of the bent impeller matter? Would it operate properly?
On starting the engine, it takes approximately 7 seconds for it to start pumping water out.
The old engine does not have a pressure guage, or temp guage.The engine water stream flow does increase as rpm increases.
Also, how would you install a temp warning?
jimh posted 03-28-2004 08:56 AM ET (US)     Profile for jimh  Send Email to jimh     
Temperature waring buzzers or alarms are electrical devices. The respond to current flow controlled by a thermostat. The thermostat is mounted on the engine and provides a contact closure when a pre-determined temperature is reached. Generally there are threaded access points in the engine designed to accept the thermostat sensor. The simplest approach would be to purchase the OEM parts and install them.
Al_A_Buy posted 03-29-2004 12:56 PM ET (US)     Profile for Al_A_Buy  Send Email to Al_A_Buy     
John - a new impeller does not have a "direction". The blades are "straight" out and will acquire a curve over time and use. Only when re-installing a "used" impeller is rotation direction important.


WHALER27CC posted 03-29-2004 01:17 PM ET (US)     Profile for WHALER27CC  Send Email to WHALER27CC     
Usually impellers go clockwise, but Al is right, they should bend to the right direction...
JOHN W MAYO posted 03-29-2004 10:27 PM ET (US)     Profile for JOHN W MAYO  Send Email to JOHN W MAYO     
Thanks for the info on the impeller. I had to bend the rubber to put it in, I did not know if that made a difference to the direction.
Fishcop posted 03-29-2004 10:49 PM ET (US)     Profile for Fishcop  Send Email to Fishcop     

I installed a new impeller on the 150 Merc not too long ago and as I recall, they did require a slight bend in the clockwise direction as viewed from the top of the lower unit.

If you are getting water from the confidence stream, probably doing fine.

Check with your local Merc dealer for the availabilty of a temp sensor.


JOHN W MAYO posted 03-29-2004 11:16 PM ET (US)     Profile for JOHN W MAYO  Send Email to JOHN W MAYO     
Thanks for the answers. Fishcop, yes I was getting a good stream of water, but had Major Eng Problem today. It may have bit the dust. I hope I can repair it, but not looking to good right now.
Mr Blue Wine posted 04-23-2004 09:22 PM ET (US)     Profile for Mr Blue Wine  Send Email to Mr Blue Wine     
I found a passage in the Mercury Shop Manual regarding all High Pressure/High Volume water pumps for Mercury (1965-1991, 90-300hp):

Apply thin coat of Multipupose Lube to inside of the pump cover. Slide the assembled water pump down over the diveshaft and water pump studs. Rotate the drive-shaft CLOCKWISE and at the same time push down on the pump cover to ease entry of the impeller into the cover.

If you do this correctly, the arms of the impeller will curve to the left.

I have a 1980 Merc 200 and had the same experience you described.


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