Bimmerfest - BMW Forums - View Single Post - What engine combinations are known to work in the E39 when the need arises to replace
View Single Post
Old 03-14-2011, 10:09 PM
franka franka is offline
Officially Welcomed to the 'Fest
Location: Lakewood
Join Date: Jan 2006
Posts: 8,776
Mein Auto: E39 540i Sport
Originally Posted by Jimmys 530i View Post
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.
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.

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)

540, Dirrezas (4) @ 275/35-18 ea, Eibach springs & bars, Bilstein Sports, Dinan Stage 2, slotted ATEs, Hi-Temp HTP pads, SS Lines, UUC-SS, White/Tan, Bling-free & Stealthy

Last edited by franka; 03-14-2011 at 10:23 PM.
Reply With Quote