Diagnosing your Head Gasket is Blown, by looking for the symptoms, can be quite misleading.
This is because a failed head gasket is NOT a single thing. Head gaskets may fail in several different ways. Many failure types are possible, each with different symptoms.
The symptoms that we may notice will depend on how and where the head gasket fails. Exhaust fumes immediately destroy inhibitors in the coolant, and set up an acid condition.
This is bad enough, but the coolant will then conduct electricity, and a galvanizing reaction will begin among the various kinds of metals in the cooling system. This will eat away at the radiator and other parts of the system from the inside. If the coolant should also enter the cylinders (which can happen, but fortunately not often) the result will be a poorly running engine, with less life, and coolant contaminating the engine’s lubricants. Combustion leaks in the valve area force coolant away during heavy acceleration causing excessive heat build-up. When acceleration stops, the diverted coolant rushes back to the area, resulting in internal engine damage.
TYPES OF HEAD GASKET FAILURES
ENGINE MISFIRE CAUSED BY A LEAKING HEAD GASKET
A head gasket that fails between cylinders will generally cause a misfire and perhaps few other symptoms. With a failure between cylinders, compression from one cylinder leaks into another. Lowered compression results in a rough idling engine. Damage of this type may not cause overheating, coolant in the oil or any other outward sign.
OIL IN THE COOLANT AND COOLANT IN THE OIL
Head gaskets may also fail between the coolant passages and the lubrication system. This type failure may show up as oil in the coolant or coolant in the oil. It is also common to find failures between an oil passage and the outside. Such damage results in an external oil leak, and possibly no other symptom.It is also possible for multiple failure types to exist in an engine at the same time.
CYLINDER HEAD CORROSION
Cylinder-head surface corrosion is similar to a crack, in the way it affects the gasket. A corroded cylinder head will not allow the gasket to seal. Such corrosion occurs with improper cooling system service. If the corrosion is severe, we have to replace the cylinder head. With a less serious case, a cylinder head shop can restore the surface with machine work.
WARPED CYLINDER HEADS
HYDROCARBON COOLANT TESTING
Works with virtually any liquid-cooled internal combustion engine or generator with a closed cooling system including: gasoline, diesel, propane, natural gas and other alternative fuels. Large, single-chamber design provides greater accuracy and uses less test fluid.
- Get the engine ready for testing as if you were going to do a compression test.
- Remove all the spark plugs and Rad Cap.
- Screw in air line fitting into a spark plug hole and apply full shop air line pressure.
- Turn the engine over by hand or wrench to make sure all the valves are closed on that cylinder.
- Once pressure has built up on that cylinder check the rad for air bubbles.
- Do the same to all other cylinders looking for air bubbles.