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Join Date: Jul 2010
Location: Cleveland, OH
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Cleaning pistons

My pistons cylinders and rings are used and have grease and carbon build up on them. What is the best way to clean everything? I have brakleen and isopropanol but I don't know which is usable on my nikkies (Mahle). Any and all advise wanted, thanks.

Old 07-21-2010, 04:26 AM
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Soak in carb cleaner, 24 hrs.
Old 07-21-2010, 07:21 AM
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get the big stuff off, then soda blast.
Old 07-21-2010, 08:24 AM
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Thanks for the info, I'll go ahead with the soda blast. I asume that a dip in brakleen for 24 hours will work? what about the bores dare I even think about touching those up? there isn't too much dirt or grime in there I just want to make sure any tiny particles are not there when I put the pistons back in.

Andrew
Old 07-21-2010, 09:17 AM
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I soaked mine briefly in Castrol SuperClean and then wiped them briefly with a green scotchbrite pad. The SuperClean will take all the carbon off. You must be careful how long aluminum stays in contact with SuperClean as it will discolor it.

Carb cleaner may be more gentle on aluminum and works well.

I don't think brake clean would work as well.

Once my pistons were cleaned up, I wiped them down with brake clean and then Isopropyl Alcohol and Kimwipes. Make sure you get the piston grooves.

Good luck with it.

BTW, if you want to clean the cylinder bores, I would scrub them with soap and water and a red scotchbrite pad.
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John Flesburg
2016 981 Boxster S.................| 1983 911 Turbo - (White)
1974 911 3.2 - Red Car........... | 1974 914-6 3.2 - (Silver)
1974 914-6 3.2, GT -(Red).......| 1974 914 - 2.7 GT Clone (TBD - Saphire?)
1971 914 (TBD)..................... |
Old 07-21-2010, 09:40 AM
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One time when I had no other nasty chemicals around I used thick paste paint remover with methylene chloride and acetone among the ingredients to soften the hardened carbon on the piston crowns and in the combustion chambers and on the valves.

Worked real well, the crap wiped right off after sitting for a while.
Old 07-21-2010, 10:03 AM
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soda's softer than aluminum and will not affect the surface.
Old 07-21-2010, 10:16 AM
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You can soda blast both the pistons and the exterior of the cylinders.

The cylinder bores should get a light scotchbrite to de-glaze them
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Old 07-21-2010, 12:50 PM
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Whats wrong with a wire brush disk, on the the grinder?

I know, I'm pretty sure, I removed the flash of tin in the process.

Leakproof.

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Old 07-21-2010, 03:16 PM
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