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Go Back   E46Fanatics > Tuning & Tech > Driveline, Engine & DME Tuning

Driveline, Engine & DME Tuning
Talk about driveline improvements, NA tuning and DME tuning your E46 BMW here. This includes diffs, intakes, exhausts, chips, software and OBD tuning.

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Old 06-07-2014, 07:02 PM   #1
PancakeBimmer
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What to do about rust in cylinder?

Car was sitting for a long while and somehow water got into intake manifold and cylinders. As a result, cylinder walls are rusted

Is it possible to have it cleaned, or must it be re-bored?

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Old 06-08-2014, 02:30 AM   #2
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Was the car submerged into water?
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Old 06-08-2014, 08:09 AM   #3
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Was the car submerged into water?
No. A mix of water and oil (ccv failure) was inside intake manifold, cylinders, and intake boot/throttle body. It stayed like that for at least three months. Surprisingly pistons are super clean, but cylinder walls have some rust buildup that can be scraped.

The engine seized and wouldn't turn. Previous owner replaced CCV because of exhaust smoke, but kept parts of old hoses and used some autozone ones as well. As a result CCV wasn't functioning properly and pumped oil into rear-most cylinder causing hydrolock. Rear-most rod is bent as fuck, second and fourth are curved. Head and block are in perfect condition, so a decision has to be made whether to clean the block, new pistons, rods, pins, and bearings, or do an engine swap and sell old engine for parts.
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Old 06-10-2014, 09:40 PM   #4
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You'll have to remove the head, disassemble the engine block and I'd personally check bearing journal sizes, then you will need to have a shop hone cylinder walls as little as possible (hopefully only .001 to .002 inches) if the rust isn't too deep, then assemble the engine, etc. You will need a new set of piston rings.
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Old 06-13-2014, 12:19 PM   #5
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You'll have to remove the head, disassemble the engine block and I'd personally check bearing journal sizes, then you will need to have a shop hone cylinder walls as little as possible (hopefully only .001 to .002 inches) if the rust isn't too deep, then assemble the engine, etc. You will need a new set of piston rings.
Engine was already taken apart completely, so that is't a problem. As you suggested, cylinder walls were honed. Luckily rust wasn't as bad as it seemed at first, so we were able to do it at home with almost perfect result.

In the case of hydrolock that resulted in bent rod, is it possible to reuse pistons alone? I would assume that if rod was bent, then the next damage would be done to piston pin.

Here is the sucker




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Old 06-14-2014, 07:10 AM   #6
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Very nice, did you use a drill attachment with carbide balls to hone? You will not want to re-use the pistons. That one got beat on pretty bad. Get some 10.5:1 pistons for that thing and enjoy some new power.
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Old 06-21-2014, 01:36 PM   #7
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Old 06-23-2014, 09:17 AM   #8
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very cool
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Old 07-02-2014, 11:58 AM   #9
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New pistons with rods, rings, and bearings were installed. Bottom is ready for the oil pan, but it wont go on until chain guides arrive and front cover is installed.



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