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496 mag antifreeze leak

Old 07-25-2010, 09:52 AM
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Default 496 mag antifreeze leak

Need some help please, Noticed antifreeze in bilge,
reilled antifreeze and noticed small amount of oil film
floating in bottle. ( cant see leak any where ) Took it
to a shop for repair , they said the pump was leaking.
They changed the pump , (why the oil in bottle ) took
the boat out ran it at 4000 rpm for a few min. and
checked it , the antifreeze is back in the bilge again
and the oil film is floating in bottle when i refilled it.
Will be back at shop monday. Any ideas ?
Rick
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Old 07-25-2010, 10:21 AM
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Originally Posted by Fountain4402
Check all hoses and connections, or head gasket is blown. check the thermostat as well.
Id say the second of the three, Thanks .
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Old 07-25-2010, 10:29 AM
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Originally Posted by Fountain4402
Check all hoses and connections, or head gasket is blown. check the thermostat as well.
That would explain the oil film in the tank ( head gasket )
what would make it leak and where? maybe soft plug ?
I cant see where its comming from.
It seems to be in the area between the bottle and
the pump.

Last edited by bajarick; 07-25-2010 at 10:33 AM.
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Old 07-28-2010, 08:16 PM
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Had a leak on my 496 for a full season,finaly the hose to the water pump blew up antifreez everywhere,,replaced$1.25 clamp.
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Old 07-30-2010, 05:48 AM
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Got the boat fixed it was a rubber seal on a
heat exchanger hose.
I just want to say thanks to simmons marine /
simmons racing in franklin ohio /akron, for the
excellant job on the repairs.
Thanks again Jim for the great job.
Rick
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Old 07-30-2010, 06:27 AM
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Rick that still does not explain the oil in the bottle.
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Old 07-30-2010, 07:32 AM
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http://www.offshoreonly.com/forums/g...ml#post3130263
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Old 07-30-2010, 08:39 AM
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I had it check out and it wasnt oil , it was
something from the heat exchanger. my
mistake, am I glad !
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Old 07-30-2010, 08:43 AM
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Originally Posted by brian41
Rick that still does not explain the oil in the bottle.
The shop that did the work raced at st clair
( simmons racing ) did you see them ? I
thought you were there.
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Old 07-30-2010, 10:25 AM
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Yes I saw them and I have repaired a few 496's leaking from the lower heat exchanger rubbers....bad design but ha its one of things that keeps us busy.
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