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Cooling system loosing prime - 6 cyl ...

Old Marine Engine » Gray Marine Gas Engines - 4, 6, and 8 cylinder » Cooling system loosing prime - 6 cyl rd109 « Previous Next »

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Joe Morano
New member
Username: joemora

Post Number: 1
Registered: 04-2007
Posted on Saturday, April 21, 2007 - 03:32 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

When starting a cold engine the cooling system has lost its prime and becomes airlocked. Clamping and releasing the hose that goes from the top of the head to the thermo stats, sometimes fixes the problem when the engine is getting hot. The water pump was just replaced and we back feed the whole cooling system with water and were not able to locate any blockages. Engine pictures at url below.

Anyone have any ideas at what to replace or test?

Thanks in advance.

Joe

1956 Chris Craft Sea Skiff pictures
http://web.mac.com/jmorano/iWeb/mac/Gink%27s%20Boat.html
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Mike Hutchison
New member
Username: bentshaft

Post Number: 2
Registered: 01-2007
Posted on Sunday, April 22, 2007 - 01:01 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Joe try putting a check valve "swing gate type "in the line before the water pump down by the pick up.This will also help in not giving the engine a shot of ice cold water on restart

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