Question about 2000 Mercury Sable

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V6 engine failure

Re: 1996 Sable . . . A mechanic diagnosed the cause of a bent piston rod, in a single cylinder in my ohv v6 engine, as a result of someone having poured water into the engine. Is that possible? Further research showed evidence of water leakage past the head gasket, directly into the affected cylinder. Additionally, the heads had to be re-surfaced because they were warped.

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Doubtful if anyone poured water in there. Your head gasket failed and allowed coolant to fill the cylinder overnight. This is called hydrolock. Coolant cannot be compressed so when the compression stroke occurs, the weak point is the connecting rod or the piston top which can simply cave in. This can also happen to vehicles when driving through flooded areas if the air intake is too low. Head resurfacing is normal and best way to prevent future gasket failure. The only thing you did not mention is if the mechanic checked the affected cylinder bore for bulge. The additional pressure that bent your rod can often push the cylinder walls out of shape. If that happens the rings on the piston will not seal, making the entire job worthless.

Posted on Sep 10, 2009

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If someone pours water into your engine to vandalize it, it is very possible to do that kind of damage.you see, the piston compresses the air in the cylinder when it goes up. water can not be compressed like air, and if it gets in to the cylinder, the force from the crankshaft spinning so fast will still try to force the piston upwards. that can cause head gaskets to fail, damage to the valves, or in extreme cases, broken pistons or rods.

Posted on Sep 10, 2009

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If heads were warped, then yes coolant got into the cylinder/s . so there is your water poured into engine. a bent piston rod cannot be diagnosed, it must be seen. a would run slick 50 into this engine.

Posted on Sep 10, 2009

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re: 1996 Mercury Sable, ohv V6 . . . . A mechanic diagnosed the cause of engine failure to a bent piston rod as a result of someone having poured water directly into the engine -- is that possible? Further, research showed evidence that water had been leaking past the head gasket directly into the affected cylinder. Additionally, the heads had to be resurfaced.

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