I do not know how old it is. it is original VP so it may be from 2008
- I looked all through the lines and in the thermostat. no signs of it. It looks as though it fell off in chunks, so they may have gotten flushed through.
As far as a guide, well - I am a backyard (Well, it's actually in my garage) mechanic, but I can give you the run down.
1) locate the pump. It should be on the lower left side, along the belt. It's got 2 hoses running into it and two large hoses going into it.
2) disconnect these hoses. Just d/c the hose clamps and wiggle the hoses off - look for cracks or wear.
3) there is a Mount on the right side - mine was like a bent rod that connected the pump to the engine. Remove the two bolts holding it on, then maneuver it off the pump.
4) There are 4 slotted screws on the face of the pump. Back these out and separate them from where they connect.
5) pull off the face - you may need to do some slight prying - I used a screwdriver as mine was painted together.
6) Now you can see the impeller, pry it out with two screwdrivers.
Replacement I can only imagine is the reverse. Why do I say it that way? Well the impeller West Marine provided for me is not the correct one. The OEM part number is 3584350 - of which I am guessing was renamed sometime since 2008. So right now I am trying to located the right part number and where I can get it from. I have gotten part #s of 18-3306 or 09-812B for a Jabsco replacement or 09-812B-1 for Johnson that look promising, but waiting for some type of confirmation.
I also changed my own oil too - something I have not done since I owned my first car in 1991. (The little things I know - but all of my cars have been worth it to just hand off due to me not having good contortionists skills or the hand size of a 4 year old.)
Once I get all the part #s and the right part I will take pictures. Trust me - it is not hard.
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2008 Four Winns h180 Bowrider
3.0 Volvo Penta
2013 Dodge Durango HEMI