496 raw water pump problems
11-17-2013 | 06:25 AM
#53
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Joined: Nov 2013
Posts: 2
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Hello, I am new to the form . Does anyone know what the mercruiser OEM depth is on the seawater pump housing. I am a machinist and intend to machine the bottom of the housing bore to remove the grooves and them remove the appropriate material off the face . I appear the original dimension was 1.997" . Does anyone have a new pump housing to
Measure or know the mercruiser spec . Thanks
Measure or know the mercruiser spec . Thanks
05-21-2015 | 12:09 PM
#55
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Joined: Jul 2008
Posts: 248
Likes: 1
From: Crystal Lake, IL
a Youtube video on the install would be a great idea, I still have the stock water pump, I just changed the impeller last year, I am new to boating and the 496 and made the mistake of trying the air pump system without knowing about how it really worked, I started the motor before releasing the pressure from the pump system so im wondering if i damaged the impeller. Im sure it cant hurt to change the impeller for routine maintenance anyway, the only thing that sucks is that I dont have a whole lot of room to get to it (Checkmate Convincor 270 + 6'1" at 255 lbs = not a lot of room) I had my local marina change it for me last year and they took the back seat out and charged me $300 just for that, I enjoy doing my own work, and take pride in it, but I need to learn more, I love Youtube videos, especially in the winter, they give me something to do during the winter months and I love to learn as much as I can.
. The Youtube video below shows how this kit is installed, what the damaged pump looks like and how the stainless end plates fair after two seasons of use.https://www.youtube.com/watch?v=oqnV-FJhRvg
05-31-2016 | 08:46 PM
#56
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Joined: Mar 2002
Posts: 4,127
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From: NY
Okay, my 04 sunsation with 496 h.o. is 12 years old, took it out for the first time this season, coming off plane temp spiked to 180 and alarm went off. turns out the serpentine belt was loose and slipping, ordered a new belt, but an thinking this would be a good time to address the impeller and is probably well beyond needing replacement.
which kit would be my best bet,,,, i'm thinking the im496reb kit Nauti posted ???
which kit would be my best bet,,,, i'm thinking the im496reb kit Nauti posted ???
06-01-2016 | 07:40 PM
#59
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Joined: Jul 2011
Posts: 9,594
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From: Ft. Worth TX
here read on and they have a very unorganized shop as I heard about 100 times.
http://www.offshoreonly.com/forums/b...arket-com.html
http://www.offshoreonly.com/forums/b...arket-com.html
06-24-2016 | 02:09 PM
#60
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Joined: Jul 2008
Posts: 248
Likes: 1
From: Crystal Lake, IL
I've dealt with them several times over the last (3) years and even when I had a problem with an early revision of the impeller they made it right a year after the original purchase. I'm two seasons into these latest revision impellers and no issues. Hardin makes some top notch stuff, but have had a problem with their pumps as well. Both stepped up and made it right, but biggest difference was Harden is a retailer and selling products is their primary business.
