Antifreeze leak at transom

Rocky001

Recruit
Joined
Apr 29, 2016
Messages
5
Was passed down a 23 ft sea hawk very nice condition. Has a 470 mercruiser 83 MDL replaced pump seals gaskets act put antifreeze in and got down to hoik up water ears and notice that antifreeze was on ground. It is coming from exhaust best place to start lookin?
 

Rocky001

Recruit
Joined
Apr 29, 2016
Messages
5
Was passed down a 23 ft sea hawk very nice condition. Has a 470 mercruiser 83 MDL replaced pump seals gaskets act put antifreeze in and got down to hoik up water ears and notice that antifreeze was on ground. It is coming from exhaust best place to start lookin?

Things free are not really as they appear
 

southkogs

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Staff member
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Jul 7, 2010
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14,783
Welcome aboard Rocky: not sure if I'm following you, though -

Is this a new boat to you? Is it closed cooling?

If it was winterized and you haven't run it yet, then I'm wondering if the PO didn't have antifreeze in the engine for the winter.
 

stonyloam

Vice Admiral
Joined
Mar 13, 2009
Messages
5,827
Heat exchanger. Pull aft plug on underside of the heat exchanger to drain the seawater side of the exchanger and look for antifreeze there. May have a bad tube or seam between the antifreeze and raw water sides. If not look at the exhaust elbow gasket.
 
Last edited:

Bondo

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Apr 17, 2002
Messages
70,464
Ayuh,... Welcome Aboard,.... If the raw water side was winterized with antifreeze, Southkogs nailed it,....
 

Mercruiser420

Petty Officer 3rd Class
Joined
Nov 24, 2015
Messages
92
You mentioned "it is coming from exhaust". leaking manifold/riser? Can you do a pressure test?
 

thumpar

Admiral
Joined
Jun 21, 2007
Messages
6,138
You mentioned "it is coming from exhaust". leaking manifold/riser? Can you do a pressure test?
Since it was on the ground I would think it is out the raw water side not the coolant side. The exhaust is raw cooled.
 

Rocky001

Recruit
Joined
Apr 29, 2016
Messages
5
Yea the boat was my uncles they give it to me was prepped for winter. But after looking thru forum's got a lot of good ideas to do before I start it up not really shure how long it has been setting so not gonna take any chances.I am gonna pull the tube and check it just way to much antifreeze leaking out. Was carport kept but setting is worse than running them in my opion
 

Rocky001

Recruit
Joined
Apr 29, 2016
Messages
5
I am just gonna kit the lower unit while I am at it because I don't know anything about it does Iboat offer a kit for a mercruiser Alfa 1
 
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