Mercury Water Pump?

[BoatNoobie]

Sorry, I'm a noob. I am in the process of replacing my impeller. While at it, I noticed the top of my water pump looking odd. Since this is my first time ever, I dont know what is normal, or warning signs...

I noticed the inside hole where my housing touches the shaft looks all chewed up.
I know I had some water mixed in the lower unit when I drained it this past fall. Could tell by the color. I was hoping it was just from the drain plugs....

Anyways, there was some water trapped inside the water pump when I pulled it out. Surprised me. Inside of it, you can see a little bit of some kind of plastic sticky out.

See some surface rust on the bottom of the shaft.

Is this normal? I dont really know what needs to be replaced now.







So I removed the bottom seal on the waterpump. There's another seal inside, but it seems to be attached to the waterpump housing? So I stretched the seal down like unrolling a sock I guess to flush out the gunk that's stuck inbetween. It looks like little bit of pieces of the plastic washer above and below the impeller. The washers were not in place when I removed the impeller. Only half of 1. So I guess it got ripped apart and got inbetween the pump seals.

The 2 oil seals themselves look good to me. The ones with the metal ring spring. Now looking over the manual, do I need to use the waterpump tool? I dont even understand what it's talking about. Doesn't make sense to me.


May just order a new assembly and call it good. Or maybe I can just reuse this one and save $50?

[BoatNoobie]

I forgot to mention, on my driveshaft, there is a ring scored onto it from the upper metal impeller housing. Is this normal?

[BoatNoobie]

Alright, finally figured out what the last diagram was showing. I wasnt able to remove the inner seal though. Didnt see how, without destroying the pump housing. Anyways, I just pressed the outter seal back on without too much effort.

Now I'm having a hard time putting the pump back into the bottom of the shaft. Used a hammer and flattip screwdrive to tap it into place. Marking up the little notches pretty badly.. Anyways, the top of the pump, is not flush with the top of the lower unit casing. It sits just slightly above it. Is that how it's suppose to be, or do I need to keep working the pump deeper?

[tbird175]

Had a similar problem with my v6. I used a pipe to drive the housing down to the right position.

[BoatNoobie]

Had a similar problem with my v6. I used a pipe to drive the housing down to the right position.

but what's the right position?