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Gas\Diesel Engine & Transmission:

Bad Head Gasket???



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Old 08-18-2010, 09:07 PM   #1
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Bad Head Gasket???

So I got this curious little problem. After driving my K5 around for +30 minutes the engine will build too much pressure and send all the water out of the radiator to the over flow tank. At first I thought it was just a collapsed lower hose. Then I got a new thermostat(drilled a 1/8" hole in to help relieve the pressure) and the results are mixed. I did get the some movement on the gauge now. Which is a great thing when the chance of overheating is involved,(must have been a 160 in there before). It still sends water to the tank, but it hasn't sent enough to overfill the over flow tank.
So if anybody has another idea for me, I'm all ears. There is some bubble action in the radiator, looking at it when the cap is off. But only when it's cold, after it warms up it gives no bubbles. Thanks in advance.mike
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Old 08-18-2010, 09:28 PM   #2
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Find someone with a cooling system tester. It's a pump that attachés where the rad cap goes. You pump it full of pressure then wait to see if it bleeds down. Some of the parts stores sell a test strip you dip it in the rad water and it will tell you if there is anything from the cylinders leaking into the water.
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Old 08-19-2010, 11:33 PM   #3
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you might have a bubble in the top of your motor. my truck did that until the head gasket let go and blew all the water out of the system. not sure on the tbi that your truck has but mine has a tube feeding the heater coil coming from the intake so i just make sure that doesn't have any air in it
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Old 08-21-2010, 12:44 AM   #4
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Old 08-21-2010, 04:00 AM   #5
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you could have a reverse rotation water pump in place of a standard rotation, other the other way around. reverse is for serpentine, and standard is v-belt.
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Old 08-21-2010, 12:00 PM   #6
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How old/worn out is the radiator cap? Could be that it is too weak to contain the pressure.
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Old 08-22-2010, 04:26 PM   #7
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The first step in diagnosing any overheating problem is to get a GOOD radiator cap.

Too many people think they last forever, and will throw a 30 year old cap on a brand new cooling system and then are mystified why they have an overheating problem.

Next after that, replace the water pump. They are relatively cheap, and easy to do.

If you still have reason to believe it has a blown gasket....there are testers for diagnosing that. It works by suspending some sort of blue chemical above the radiator cap hole, then whith the vehicle running, you draw vapors from the radiator through the blue chemical. If you have a blown gasket it will turn yellow, if not it stays blue. I think NAPA sells the kits, Balkamp # BK 7001006. I've used them a lot and they do work, but sometimes the engine needs to be run under a load for a while the leak to open up. http://www.blockchek.com/index.htm
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Old 08-22-2010, 04:39 PM   #8
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Quote:
Originally Posted by hotrodbill View Post
The first step in diagnosing any overheating problem is to get a GOOD radiator cap.

Too many people think they last forever, and will throw a 30 year old cap on a brand new cooling system and then are mystified why they have an overheating problem.

Next after that, replace the water pump. They are relatively cheap, and easy to do.

If you still have reason to believe it has a blown gasket....there are testers for diagnosing that. It works by suspending some sort of blue chemical above the radiator cap hole, then whith the vehicle running, you draw vapors from the radiator through the blue chemical. If you have a blown gasket it will turn yellow, if not it stays blue. I think NAPA sells the kits, Balkamp # BK 7001006. I've used them a lot and they do work, but sometimes the engine needs to be run under a load for a while the leak to open up. http://www.blockchek.com/index.htm
This is very good, rock solid advice. I'd follow it. Listen to HR Bill.
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