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496 Mag HO owners beware

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Old 07-29-2005, 08:51 AM
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Default 496 Mag HO owners beware

This week a customer brought his boat in with coolant in the bilge. What we found was on the heat exchanger Mercury uses a large hose clamp to hold the exchanger in place. The bottom hoses don't have hose clamps on them, they just wedge in with rubber grommet's and held by the one large hose clamp. The clamp on his broke and when it got hot and pressure was up combined with bouncing around it would spray coolant out.
I would suggest 496 owners carry a spare large hose clamp and coolant just in case.

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Old 07-29-2005, 08:59 AM
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Default Re: 496 Mag HO owners beware

There are two hose clamps over the heat exchanger. And yes, they are paramount to operation.
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Old 07-29-2005, 10:58 AM
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Default Re: 496 Mag HO owners beware

Eric tell them how much a impeller kit is for one
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Old 07-29-2005, 11:06 AM
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Default Re: 496 Mag HO owners beware

Quote:
Originally Posted by Strip Poker 388
Eric tell them how much a impeller kit is for one
Impeller kit is cheep, the complete pump is 472.89$ and none of the internal parts can be replaced only impeller and o-ring.
New pump comes with
Pully
pump
w/p switch
bracket
The pump we took apart only had 110 hrs and needed to be replaced
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Old 07-29-2005, 11:56 AM
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Default Re: 496 Mag HO owners beware

$500 clams for a water pump!?!?!!? Man, my old tech 1996 454's are looking better all the time!
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Old 07-29-2005, 12:44 PM
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Default Re: 496 Mag HO owners beware

Quote:
Originally Posted by racer-x6
This week a customer brought his boat in with coolant in the bilge. What we found was on the heat exchanger Mercury uses a large hose clamp to hold the exchanger in place. The bottom hoses don't have hose clamps on them, they just wedge in with rubber grommet's and held by the one large hose clamp. The clamp on his broke and when it got hot and pressure was up combined with bouncing around it would spray coolant out.
I would suggest 496 owners carry a spare large hose clamp and coolant just in case.

Just had the same thing happen to a customer yesterday!
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Old 07-29-2005, 01:21 PM
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Default Re: 496 Mag HO owners beware

just throw a couple of the big-azz cable ties around the works next to/over the hose clamps for insurance...

then just check'em every now and then.

I did the grommet replacement this spring so I know the area.
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Old 08-01-2005, 12:19 AM
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Default Re: 496 Mag HO owners beware

Great, ONE more thing to worry about.
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Old 08-01-2005, 06:33 AM
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Default Re: 496 Mag HO owners beware

just checked mine :
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Old 08-01-2005, 07:21 PM
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Arrow Re: 496 Mag HO owners beware

I remember the press releases that GM made saying the 496's had capability to go beyond the 502...right
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