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Luckily mine were still mostly one piece but another season they would have come apart for sure. I would say anytime you buy a used 496 this should be baseline maintenance.
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Originally Posted by Sydwayz
(Post 4551288)
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Originally Posted by Knot 4 Me
(Post 4551417)
<Mine has never overheated but I think I will pull my caps at season's end and replace the gaskets just to make sure this doesn't become a problem. Wow...
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FYI extremely common for all Merc heat exchanger set ups. Posted this info as well up here a couple of years ago for someone having cooling issues with their closed cooled Merc app..
Also makes common for warning horn going off for exhaust over heat temp alarm and fault code. FYI for whomever |
FYI on the Hardin stainless rebuildable pump. Ran the boat for the first time Sunday other than on a hose or simply backed into the lake on the trailer since the install last fall. Ran the snot out of it and unlike before I no longer get the 15 degree or so temp spike at idle after a hard run. Definitely flowing more water!
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That's great. That's what I want to hear. Mine just arrived.
Here's pics of my heat exchanger gaskets, keep in mind this is with a very low hour 496 HO: http://captainyarrr.demand-performan...images/he1.jpg http://captainyarrr.demand-performan...images/he2.jpg |
^^^^^^^^^^^^^^ Thinking I may not wait until fall to change them. Wow! I've got 425 hours/12 seasons on mine.
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Just got back from buying parts: $60 peace of mind and pretty much the easiest thing you can do maintenance wise. It's just RIGHT THERE. I'd do it if I were you.
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Originally Posted by Knot 4 Me
(Post 4541189)
400 hours fresh water, impellers changed every other year, never had one come apart. Boat never ran through sand, silt, mud, etc. You can see the groove wearing into the end surface and the water inlet/outlet side of the pump was much worse. Still carried OK water pressure but after hard runs the water temp was creeping up more than it used to in the past. These pumps are also known to spit the shafts out without warning. The Hardin pumps have larger shafts/bearings.
I could not imagine that assembly coming out at 5000 rpm and bouncing arounder the bilge. |
Originally Posted by COOPS
(Post 4552876)
Doing basic impeller changes this year and the shaft slid right out of the brass housing. Outter bearing siezed and the housing now becomes the bearing. Not a scuff in the brass where the bearing seized just nice and shiney.
I could not imagine that assembly coming out at 5000 rpm and bouncing arounder the bilge. |
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