Hydrolock happens almost instantaneously when water gets into the intake system and then into a cylinder. Since water is not compressible the engine stops immediately. If the revs were very slow at the time, and the water was from an external source, the engine may not be damaged. If it happend at speed then there is probably a bent rod or more like a bent crank and a broken piston head.
Originally Posted by Jimmys 530i
Oh, I should have been more clear. I did not see any engines for the 2001+ used or rebuilt. I will call them soon, I have another customer with a 330i that overheated the heck out of his engine. He drove until the engine hydro locked from water getting inside the cylinders.
If the coolant broke into the cylinder, by any path, and at higher rpms, then the engine is toast. But this is very unusual for hdro lock
Are you sure it was hydrolocked? Maybe what happened was that the cooling system lost water and the engine got so hot that it seized. That means that the piston and cylider walls welded themselves together. It you are driving the car it will slow before is seizes. If that is what happened the engine is also probably toast. But it can be rebuilt.
Seizing and hydrolocking are two different failure models. Both invole water (or coolant with 50% water)
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Last edited by franka; 03-14-2011 at 10:23 PM.