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General BMW Model Discussion
All non E46 BMW model questions in here. Look below for E36, E90 and F30 specific forum. For additional model specific forums check out bimmerfest.com!

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Old 04-07-2014, 08:57 PM   #1
Mau330i
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Help with N62 Engine Please

This engine belongs to a 2002 745i. It was hydrolocked about 8 months ago (thats what I was told) and the owner wants me to fix it. Right now the engine does not turn (not even with a wrench)

I think the pistons rod are bent or something like that.

Have somebody here had work with one of this engines??
Is it fixable??
Do you think it is worth the job??

Any help will be really appreciated.

Thanks in advance
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Old 04-08-2014, 02:35 AM   #2
blarf
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All I learned about the N52 I learned from this: http://forums.bimmerforums.com/forum...-out-of-my-550

Whether it's worth it is up to the owner, but rebuilding an N52 ain't gonna be cheap. IMO BMW designed the engine to be disposable, and you're probably headed for fewer frustrations if you were to just buy a long block from them. The things that stick out in my mind:

- Alusil lining means that you can't rebore the cylinders
- Rings are a few grand for a set
- Lots of stuff will be worn (valve seals, valvetronic, potentially VANOS stuff, etc) and need replacement

But more importantly, if you can't turn the engine over... are the pistons rusted in place? If so, you're probably better off looking for a new block anyhow.
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Old 04-08-2014, 09:11 AM   #3
lszlszx
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Too much trouble. The engine needs to be completely disassembled even just to see the damage. Both heads, oil pan, pistons and rods need to be taken out.

Considering the cost of a rebuild and the time it takes to do it, it make more sense to source a used engine.
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Old 04-08-2014, 09:32 AM   #4
unevolved
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There's no way that'll be cost-effective to fix. I vote replace the long block, at least.
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Old 04-11-2014, 12:56 PM   #5
Mau330i
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Thank you all very much!!!


The owner insists on repair the engine

I think I will not take the car....



Thanks a lot!!!!
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Old 04-11-2014, 02:15 PM   #6
unevolved
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You could tell him you're repairing it, and just replace the short block. Most of the original stuff will still be there (heads, etc.) so it's mostly true!
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