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Old 23-07-2008, 09:45   #1
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fresh water pump air lock?

has anyone had or is it possible to have an air lock in the system after replacing the fresh water pump. do you have to prime the system by filling the block and pump with antifreeze and water first?
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Old 23-07-2008, 11:42   #2
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run it with the cap off and top up as necessary
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Old 23-07-2008, 12:35   #3
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Airlock

Hi, It is reqular that the system has air in it, I have found the easy way to bleed is to find the highest hose and slacken the easyest clip. Run the engine and you will soon find water and air leaking out; when only water is escaping retighten the hose and refill the header tank. You must check that there is water at all times in the header tank, two sets of eyes and hands helps no end. Calm seas and fair winds Peter
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Old 23-07-2008, 19:06   #4
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What kind of engine?

Perkins...sometimes are notorious for this

Some Lehmans and Westerbekes have a little petcock.
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Old 24-07-2008, 09:14   #5
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westerbeke 58 I took the thermostat off and there was quite a bit of air that released out when removed. I then filled the block and pump but have not yet started the engine. I would have thought that air in the block would have made its way out easily but it didn't, but come to think of it the cooling system must be under pressure when hot I would think?
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Old 24-07-2008, 09:38   #6
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I am interested in the answer also. I have 1976 westerbeke 30B. I have not located an overflow bottle. I think my heat exchanger is losing a little water. The temperature guage is not registering which makes me think that there is not water in the block. There is water pumped out of the exhaust but I think there is also steam. The oil is not milky. I haven't had the time to investigate any further.
John
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Old 24-07-2008, 19:08   #7
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The air that gets trapped does not come out...it sort of settles in a high spot....is there any king of fitting on the top of your thermostat housing?
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Old 25-07-2008, 02:09   #8
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Has anyone used an automatic air vent, and vacuum breaker (as used on hydronic heating systems)?

http://www.armstrongpumps.com/Data/i...874_AV_I&O.pdf

http://www.bellgossett.com/literature/files/6583.pdf
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