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How accurate is the chemical test done on vehicles to determine if head gaskets are blown?

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Hello. This test is generally reliable. Get a chemical test kit from the auto parts store. It will show if there's presence of combustion gases in the cooling system.

NAPA carries this one under Balkamp # BK 7001006 - http://www.blockchek.com/index.htm

Sometimes you need to get the engine up to operating temperature for a little while before a crack will open up.

Posted on Jul 18, 2010

  • Yuri Grant Roper Jul 18, 2010

    Other than removing the head for repairs, is there another solution like maybe Loctite Block and Head sealer and how effective is it? Are there also other sealants one can use?

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1 Answer

What is a simple chemical block test to confirm a head gasket issue?


Well now, that's a quetion with many answers but here are a few videos for the DIY or Do It Yourselfer... The second one might be more descrptive but both are answers.
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I have water in the engine oil. Could it be a water pump seal or a blown head gasket?


When you say that you have water in engine oil, do you mean that you have coolant mixed with oil ?
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The Best And Easiest Way Is To Take the Head Off And Have Head Pressure Tested Welded Or Replaced Fit New Head Gasket And Repaired Replaced Head You Are Done.

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Well phyllis it could be several things like a blown head gasket,cracked block,warped head or intake manifold gasket leaking.You need to have your mechanic do several test to determine what the problem.Needless to say its going to be exspensive to fix.

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1 Answer

I have a 98 Ford Expedition, shut off on its own while driving down highway after check engine light started blinking, started back up right after. Got home, Coolant smells like gasoline. What could be the...


Perhaps a blown head gasket. It takes a fairly good misfire for Fords computer to actually flash a code. A blinking check engine light indicates a cylinder or multiple cylinder misfire. The fact that you smell gasoline in the coolant AND your check engine light is flashing leans toward a blown head gasket. I'll explain: When a head gasket blows between a cylinder and a coolant jacket (port coolant runs through to keep engine cool) that coolant can now enter into the cylinder chamber and the fuel and exhaust can also enter into the coolant system.Your coolant system can be pressurized up to 16psi under normal driving conditions so there is quite a force there and if there is a place for that coolant to go, it will find it. When coolant enters into the cylinder it creates a misfire. (water mixed with fuel and air does not make a very good ignition source) So then on the exhaust stroke, it can then expel this fuel/water mix back into the coolant system by way of that blown gasket, during an exhaust stroke the pressure is well beyond the 16lbs of your coolant system and can then force its way back in. This would explain a flashing light and the smell of fuel in the coolant. But for it to die while driving down the road....it would have to be misfiring on more than just 1 cylinder or there is a separate issue on that one all together. With a head gasket blown between the coolant port and the cylinder, you may not see a visible leak from the outside. In this situation one would look at the coolant for signs of floating oil or carbon, pull the oil dipstick and look to see if it is a milky brown color, bubbles also indicates water and/or use a chemical test. You can't pick that up at walmart though. But this chemical test would be a blue chemical placed into a clear cylinder or tube with a suction ball at one end. You remove the radiator cap, start the vehicle then place this tube over the spot where the cap was. Must not let it make contact with the coolant though. Squeeze the ball several times, this draws in air and/or vapors. IF the blue chemical begins to turn yellow it has detected exhaust gases in your coolant system confirming a blown head gasket. Sorry so lengthy...hope it helps.

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1 Answer

I have coolant on my oil dipstick is it intake or head gaskets


I would suspect a blown head gasket. STOP driving the vehicle immediately or serious engine damage will occur. Drain the oil and change the filter. The head itself may also be cracked. A compression test will determine if the head gasket is blown or the head is cracked. Take it to a trusted mechanic for diagnosis and repair if he is close by. If not have it towed in for repair.

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If there is oil inside the coolant liquid that is the head gasket.

Check first if oil can leak into the coolant tank from the cap.

Usually when you get oil into the coolant liquid you have an head gasket problem, do a compression test, or buy the home tester below.

eBay.co.uk Guides - HOW TO TEST FOR A FAILED HEAD GASKET
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first up , if there was no compression test done to determine if the head gasket is in fact at fault then do not take that persons word for the fault
the original problem could be blocked radiator cores that could handle the extra cooling required by the long trip at speed, could be a problem thermostat or radiator hose collapsing
while you may now have a problem head gasket / warped/cracked head that is just the symptom of a failure elsewhere
from your statement I would recommend that you find an accredited service center with experience on your make of vehicle and get proper diagnosis and quotes as it will cost you a lot more from your inexperience if you diy

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