Ford transit white smoke

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I have Ford Transit Connect 2013 model. I'm taking about heavy smoke, coolant leaking, overheating
I need to mention little bit history of this van.
This vehicle came weeks ago. thermostat leak. empty coolant tank and customer says about little smoke
Because of leake, i changed the thermostat, bleed the coolant system, and start the van. after that little somke changed to heavy smoke.
i think earley no coolant and leak from the thermostat. after fixed the coolant leak all coolant come to the exhaust system, because of head gasket failure.
so I'm confirmed this vehicle has head gasket problem
REGULAR COOLANT CHECKS CAN BE BEST SOLUTION TO THIS PROBLEM. ALSO DON'T NEGLECT COOLANT LEAKE PROBLEM.

1) Overheating

An engine overheating one too many times (as a result of a clogged radiator, coolant leak, faulty fan, etc.) can cause head gasket failure but, conversely, a blown head gasket can also cause the engine to overheat. Hot exhaust gases can leak into the cooling system, or coolant can leak into the cylinders and be burned off as steam, either way, the end result is an overheating engine.

If the car is driven while overheating, it can also result in the alloy cylinder head warping, or steam damaging the catalytic converter, adding significantly to the cost of repair.

2) Loss of power

If a failed head gasket allows compressed air/fuel to escape, the compression of that cylinder is reduced. This loss of compression results in a rough running engine and a notable reduction in engine power. This sort of failure typically is accompanied by a sound like an exhaust leak.

3) Oil contamination

One of the clearest signs of head gasket failure is the milky sludge on the underside of the oil filler cap or the dipstick, sometimes jokingly called a "milkshake" or "mayonnaise". This is caused by coolant getting into the oil, and vice versa. Although not conclusive proof of head gasket failure this is generally a good indicator and is a sure sign your engine needs to come apart to find the source of contamination.

This also means antifreeze will have contaminated the oil, so any driving will quickly ruin the engine’s bearings. Repair requires an engine oil flush at the very least, plus a replacement oil filter, and often complete disassembly of the bottom end of the engine to ensure the bearings aren't damaged and clear out all contaminated oil.

4) White Smoke

A faulty head gasket most often results in billowing clouds of sweet-smelling white smoke coming from the exhaust. Thie smoke is caused by antifreeze leaking past the gasket and into the cylinders, where it is turned to steam as part of the combustion process. Less common, but still possible, is a leak from an oil passage to the cylinder, which would cause blueish smoke.

Either of these types of gasket failure will also allow combustion pressure into the cooling system or oil breather system. If a radiator hose suddenly blows off its water outlet, or the dipstick won't stay put, this could be the reason.

5) External leaks

If a cylinder head gasket has blown between the water or oil passage and the outside of the engine, the result can be a simple coolant or oil leak. This is the least dire version of a blown head gasket, but is serious nonetheless.

An external leak may not manifest itself as an immediate problem (other than causing a mess), but if the coolant level is allowed to drop too far, it can lead to serious engine issues. The other issue is that leaking oil could get on the hot exhaust leading to acrid smoke, and possibly fire.

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Your head gasket has blown, or you drove through water.

tom.