Bubbles in fresh water cooling system

[Ryan Turner]

My engine seems to run a little hot ever since the fresh water part of the cooling system was partially drained by accident the other day. Nigel Calder says that air pockets can form in the closed-loop fresh water system and that these can cause engines to run too hot. Apparently you can tell if you've got one by looking into your expansion tank to see if water is circulating through the tank. If it's not circulating you've got a bubble or air pocket. I looked and could see no circulation in my tank. My question is how do you get rid of a bubble/air pocket? I remember somebody talking about this in an earlier post. Apparently these air pockets commonly form in the heat exchanger of a hot water tank. I think there's some technique to get rid of them but don't know the specifics. Anybody out there know what to do? I'd sure like to hear what you've got to say.

My engine is a 1983 24 hp Universal model 5424 in a CD33.

Thanks



rdtec@aol.com

[Tom]

My engine seems to run a little hot ever since the fresh water part of the cooling system was partially drained by accident the other day. Nigel Calder says that air pockets can form in the closed-loop fresh water system and that these can cause engines to run too hot. Apparently you can tell if you've got one by looking into your expansion tank to see if water is circulating through the tank. If it's not circulating you've got a bubble or air pocket. I looked and could see no circulation in my tank. My question is how do you get rid of a bubble/air pocket? I remember somebody talking about this in an earlier post. Apparently these air pockets commonly form in the heat exchanger of a hot water tank. I think there's some technique to get rid of them but don't know the specifics. Anybody out there know what to do? I'd sure like to hear what you've got to say.

My engine is a 1983 24 hp Universal model 5424 in a CD33.

Thanks

I was the guy who made the post about getting bubbles out of your "fresh water" system (actually coolant). The way you clear them is to pull the hose that runs to the bottom of the water heater off the bottom of the expansion tank and blow mightily into the hose. That forces the coolant up against the top of the exchanger in the water heater and forces the air bubble into circulation. After a little while with the engine running, it makes its way around the system and bubbles up through the expansion tank. You have to blow really hard and of course you put your thumb over the bibb on the expansion tank so the coolant doesn't run out while you've got the hose off and youu hold the hose up high so the coolant doesn't drain out of the water heater. So the procedure is pull the hose and blow, then put it back on and run the engine for a minute looking in the expansion tank with the cap off to see if you get any bubbles. Shut the engine off and do it again several times until you get it clear. BTW you won't see circulation in the expansion tank until the engine heats up and the thermostat opens. Don't burn your lips on hot coolant. Let everything cool donw before you do the blow procedure. Good luck!



TacCambria@thegrid.net

[Joe Wysong]

The manual for your engine recommends the following:

With the engine out of gear, wait until the engine starts to overheat and then goose it to 2500 to 3000 rpm and quickly reduce the rpms. You may have to repeat the proceedure 3 or 4 times to remove all the air bubbles.

Joe
Annie Laurie - CD 330



tgjournal@gestalt.org

[Larry DeMers]

Be careful if that expansion tank is filled with anti freeze..especially the car type anti freeze. Don't ingest any at all. It's detrimental to life, as they say.

Larry

My engine seems to run a little hot ever since the fresh water part of the cooling system was partially drained by accident the other day. Nigel Calder says that air pockets can form in the closed-loop fresh water system and that these can cause engines to run too hot. Apparently you can tell if you've got one by looking into your expansion tank to see if water is circulating through the tank. If it's not circulating you've got a bubble or air pocket. I looked and could see no circulation in my tank. My question is how do you get rid of a bubble/air pocket? I remember somebody talking about this in an earlier post. Apparently these air pockets commonly form in the heat exchanger of a hot water tank. I think there's some technique to get rid of them but don't know the specifics. Anybody out there know what to do? I'd sure like to hear what you've got to say.

My engine is a 1983 24 hp Universal model 5424 in a CD33.

Thanks

I was the guy who made the post about getting bubbles out of your "fresh water" system (actually coolant). The way you clear them is to pull the hose that runs to the bottom of the water heater off the bottom of the expansion tank and blow mightily into the hose. That forces the coolant up against the top of the exchanger in the water heater and forces the air bubble into circulation. After a little while with the engine running, it makes its way around the system and bubbles up through the expansion tank. You have to blow really hard and of course you put your thumb over the bibb on the expansion tank so the coolant doesn't run out while you've got the hose off and youu hold the hose up high so the coolant doesn't drain out of the water heater. So the procedure is pull the hose and blow, then put it back on and run the engine for a minute looking in the expansion tank with the cap off to see if you get any bubbles. Shut the engine off and do it again several times until you get it clear. BTW you won't see circulation in the expansion tank until the engine heats up and the thermostat opens. Don't burn your lips on hot coolant. Let everything cool donw before you do the blow procedure. Good luck!

demers@sgi.com

[Ryan Turner]

Appreciate the responses!



rdtec@aol.com