by 
dwil
ANSWERS: 14
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At best you'd just need a new gasket. Slightly worse (and most common) is that you'll need the head skimmed. A cracked head would mean more lightening of your wallet as it would have to be replaced. There are worse things that could happen to an engine and a blown head gasket is usually cheaper to fix than a timing belt/chain breakage.
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Oil can leak out of the engine causing unexpected and terminal engine seizure due to lubrication failure. Coolant can leak out in to the oil causing the above, or out of the engine itself causing overheating due to lack of coolant in the system. Continuing to use the vehicle will cause deteriorating performance, and risks an accident if power is lost totally at a crucial moment.
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Complete engine failure due to overheating, Coolant mixing with the oil as coolant is not a lubricant and will ruin the bearings possibly causing the engine to seize up, damage to the rings etc. All this can happen if you continue to drive the vehicle with a blown headgasket including what all the others have posted.
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You will also have lower compression so you will be overloading your starter motor, especially on a cold morning as it may take many cranks to get intial firing. This will burn out the armature and brushes on your starter motor.
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A whole bunch!
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thie answer depends on wether it over heated or not and if there is more than one problem. if it is blown because of old aged anti-freeze and corrossion then depending on the vehicle and engine that will determine how bad this is. most head gaskets are made of steel and fibre. and will leak if anti-freeze is not maintained properly
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if coolant in oil then seized big ends then wild pistons resulting in the pistons trying to go through the head. compresion to water results in overheating with bursting pipes and exploding radiator. overheating will cause the fan to come on more often and will blow the fan relay eventually. bets to get head done asap as a good car can be scrap if not done
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You will have to replace the engine.
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None, it's the other problems that arise from the blown head gasket. Oil can leak and catch fire, or the rod bearings can be destroyed and possibly, if you're not paying attention to unusual noises, the rods can put holes in your engine block. Need I go on?
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get the head magnafluxed check it for cracks, surface it,get new head bolts, torx everything right. change the oil before starting.
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it'll probably overheat and you might have to get the head skimmed if the heat warps it
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If you dont keep driving it you will be fine in some cases the coolant will keep your plugs from firing, it is a cheap fix if u do it yourself, just pull the plugs and turn your engine to see which is full of coolant, if u fix it yourself be sure to pull ur intake then ur heads. send ur heads to be magna fluxed and pressure tested and be sure u replace all of the gaskets.
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It is pretty much toast. With a blown headgasket, depending on where it is blown, water, oil and gas can all mix together and get into the cylinders or run out the side of the engine. You can imagine how well it will run with water and oil in the cylinders. It can also lose all the water and oil and overheat. It won't get very good compression that way either. It may still limp along for a little while, but it is pretty much toast. You might find the following link useful for understanding car engines. This shows how the cam and crankshafts work together to produce power. Your camshaft is located in the head. The crank is in the block. The head gasket seals the gap between the head and block, keeping the oil, coolant, gas and compression in the parts of the block and head that they belong in. http://auto.howstuffworks.com/engine2.htm
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I work on motors all of the time I blew a head gasket in my truck a couple of weeks ago if u know what ur doing it will take about three days to fix that includes having ur heads checked possibly shaved, do not worry it is not toast I replaced mine and it runs great I am about to run it in the 1/4 mile next weekend, I have also changed the head gaskets in other vehicles as well if u need I can tell u step by step or u can let a mechanic do it for u.
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