made an oops with water pump impeller...

powell0819

Seaman
Joined
May 28, 2011
Messages
57
*sigh* so we got our lower unit off (76' mercruiser 120), cleaned out all the junk, took out the water pump impeller and bought a new one so we can install it when we get home. There's one big problem. We forgot which direction the impeller fins were turned when we took it out! We don't have a service manual yet but that's top of the list to buy.

Is there a way we can tell which way the old impeller was sitting in the housing? Its all frayed, cracked and bent up so we for sure needed a new one. I don't want to set the impeller in the housing with the fins turned the wrong direction. Won't be making this mistake again :(
 

Don S

Honorary Moderator Emeritus
Joined
Aug 31, 2004
Messages
62,321
Re: made an oops with water pump impeller...

Turn the vertical shaft clockwise when installing the pump housing. More details in the file below.
 

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  • A1 Impeller replace.pdf
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powell0819

Seaman
Joined
May 28, 2011
Messages
57
Re: made an oops with water pump impeller...

Thank you so much Don. This is the perfect information. :)
 

Don S

Honorary Moderator Emeritus
Joined
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Messages
62,321
Re: made an oops with water pump impeller...

Haven't visited the stickies at the to of the forum have you?
 

powell0819

Seaman
Joined
May 28, 2011
Messages
57
Re: made an oops with water pump impeller...

I glanced in there but I couldnt find anything on it and even did a search for past threads but most of them had talked about having a service manual which we dont have yet. Ill make a better attempt at looking through the stickies before I post another already answered question :)
 

vincechig1975

Petty Officer 1st Class
Joined
Oct 28, 2011
Messages
213
Re: made an oops with water pump impeller...

Hey guys, Alpha outdrive .....is there a wrong way to install the impeller? Just checkin from what I could see there looks like there isn't.
 

Don S

Honorary Moderator Emeritus
Joined
Aug 31, 2004
Messages
62,321
Re: made an oops with water pump impeller...

On this type pump, it's not a problem they will flip over to the right direction, but that isn't the case on all pumps. Just put it in the right direction, it's not hard to do.
 
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