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If you mean "hydro lock", that is when coolant enters the combustion chamber and prevents the engine from turning (water doesn't compress)
That is when a cylinder fills with liquid and will not move. Liquids will not compress like air so it will stop the piston and usually damage the engine
Hydro-lock happens when liquid instead of gas enters the cylinder. As the piston travels up - the liquid cannot compress like a gas would and the engine basically just stops. If this happens when trying to start the engine - usually it's not a big deal. Just need to remove the liquid and clean out the cylinder and crankcase. If it happens while the engine is running (Not as likely) It will do major damage to the engine. Usually more damage than the machine is worth. Usually with a lawn mower, Hydro-lock occurs at start-up because fuel has leaked past the carb and into the crankcase and into the cylinders.
Yes, it can "hydro lock" by sucking in water and it can "seize" from running it without oil.
simply answer , Replace the old one with the the new one.
you look if the owner out a lock on the engine
Depends on where, and how much. There will be a little there due to condensation, which doesn't really affect things. But if you get a lot of it, it can destroy the oils in the pan, and with that the lubricating system. Or if it gets in the cylinders you can get something called "hydro lock" which can destroy the engine. Or get it in the electrics, and the engine will most likely not run.
Chances are the answer is no. The 6.0L is still a very problem riddled engine and ford cant wait when they can stop paying warranty claims on them. A couple things could of happen one egr cooler blew which introduced engine coolant into the intake manifold engine hypro-locked and bent that way or I have seen the injector for whatever cyl has the bent push rod pintle is stuck open causing unmetered fuel to fill the cyl which can also cause a hydro lock condition. When both these hydro lock scenario's happen you can also bend 1 if not all your connecting rods as well so be carefull turning over and running if a hydro lock condition is present. Good luck.
more likely to need a new thermostat in engine , than an air lock.
The vehicle would run very badly if at all. There would be large amounts of black smoke coming from the tail pipe. Because diesel will not burn as well as gasoline, the engine would have multiple misfires, which will cause stalling issues. With newer cars, the amount of unburnt fuel being dumped into the exhaust would cause the failure of oxygen sensors and the catalytic converter. In severe cases, the engine could hydro-lock (when an internal combustion engine is forces to compress a fluid. Being that fluids cannot be compressed, hydro-lock usually results in damage to internal engine components.)
If it's the 3.1 or the 3.4 that's typical for that engine, you will have to get it fixed immediately or risk hydro locking the engine and then you will be buying a new engine, figure between $550 to $650 to have it repaired.
When the engine can no longer rotate.