Well I tryed to start the New Year off right and put the boat in the water today. I fired it up and one of my motors was not blowing water out the mufflers. I no it can't be hard but I have never changed what ever I need to change to suck up water. Any advice would be much appreciated.

Well that would be your impeller. I am by no means an expert. I have older 454's the impeller is located below the motor on the left side.

It's not a technical hard job, but getting the thing out can be some work.

So there is not a water pick up in the out drive?

Your freshwater pump pulls from the water pick-ups on the drive the impeller is in the freshwater pump (located on lower left of engine the pump is driven by your serpentine belt). You might as well do both engines while its being done. I think the kit is around $75 bucks.

If you're not familiar with your engines it might be better to take it to a mechanic.

You have HP500's, right ?

Here's a breakdown of it:
http://www.mercruiserparts.com/Show_...+PUMP+ASSEMBLY

It is located on the lower starboard side of each engine.

Don't forget to backflush the coolers while you have
the pump off.

Thank you guys for the help. I just took a look at it and it looks pretty simple. I didn't know what I was supposed to be looking at, thats pretty funny. First I'll be changing impellers and next adding blowers it's all the same!! Thanks again.

One other thing.

note the positions of the hoses,
they can be reversed, if you do that,
you'll have it apart again to replace
the new impeller you just burnt up

HOPE THIS HELPS
http://www.offshoreonly.com/forums/s...d.php?t=108106

I did that years ago. IT SUCKED! Talk about feeling like the world's biggest dumbass.