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Ken911's Avatar
 
Join Date: May 2005
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cleaning piston tops

Ok so I pulled the pistons off, and the rods out. I recieved the engine in pieces and boxes it had been appart for a valve job. but i decided to replace the rod bolts and cylinder studs with race ware. glad i did the back two cylinders #3and#6 had damaged bearings i noticed that the stampings on the rods were different than the other 4 and also those 2 pistons were a lot harder to remove. so I will be very care full about checking weights etc. Any ways how do I clean the heavy coating of carbon off of the piston tops without damaging them.it is pretty thick I was thinking about using an air grinder with a fine wire wheel But I dont want to cause any damage so I thought i would ask first. One more question did the 88 930 3.3 turbo engines have alusil or nikasil cylinders? Thanks the book has been a big help!!!
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88 turbo Guards red Targa slant nose, and yes I am a horsepower junkie, Boost freak,Boob freak,
k-27hfs, 3.4liter,7.5 to 1 JE pistons,SSC cams,Adjustable WUR,Imagine fuel head, 1 bar waste gate headers,allthe cis toys. Now apart to become the next EFI monster.
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Last edited by Ken911; 12-02-2005 at 05:54 PM..
Old 12-02-2005, 05:49 PM
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A soft wire wheel is okay, just make sure you only let it touch the tops...

Cheers
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Old 12-02-2005, 06:43 PM
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All Turbos came with Nikasils, according to the manual.
Old 12-02-2005, 06:54 PM
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Glass beading is fine as well.

AFJ
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Old 12-02-2005, 07:25 PM
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Soak overnight in a bucket of carb cleaner.

If you bead blast or wire wheel, stay away from the ring lands.

Sherwood
Old 12-02-2005, 11:27 PM
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I'll second the carb cleaner. You can buy a gallon can of Berrymans carb cleaner. It's not the same stuff as in the aerosal cans, it's stronger. Soak overnight and in the morning the carbon just washes off.
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Old 12-03-2005, 05:12 AM
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Third on the carb cleaner. I'm refurbishing my 3.2 liter and have had great results with berrymans carb cleaner.
Old 12-03-2005, 08:39 AM
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ok I'll try the carb cleaner thanks!!!
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88 turbo Guards red Targa slant nose, and yes I am a horsepower junkie, Boost freak,Boob freak,
k-27hfs, 3.4liter,7.5 to 1 JE pistons,SSC cams,Adjustable WUR,Imagine fuel head, 1 bar waste gate headers,allthe cis toys. Now apart to become the next EFI monster.
05 Cayenne S lapis blue
Old 12-04-2005, 09:35 AM
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I use carb cleaner as well
Old 12-04-2005, 08:13 PM
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Hot tank for many hours is best. Watch out for glass beads, the number ONE cause of rebuilt engine failure. Never glass bead the ring lands, tape them off first. Clean and clean and clean again if you glass bead it. Otherwise use green 3 M pads, manuel or on a die grinder.
Old 12-05-2005, 10:18 PM
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Careful what the hot tank guy uses inside his hot tanks. Depending on who you entrust, some solutions not meant for the task may reduce the displacement provided by the pistons.

I think a room-temperature cleaner, within the confines of your property and under your control are best for expensive pistons.

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Old 12-05-2005, 10:44 PM
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Any legal room temp soln will not clean off the carbon. Most water based solvents for hot tanks are safe on Al if they are properly maintained, if not, oh well. Like anything else not properly done the results can be a disaster.
Old 12-06-2005, 07:12 PM
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I have to throw out my shiny testimonialto the magical powers of a product called Safety-Kleen. a local motorcycle shop here uses the stuff and I found myself bringing my parts to them all the time. Long story short, they got sick of me hogging their pale of solvent so I bought my own 5 gallon pale of it. Tie some wire to the peice and drop it in there, forget about it till tomorrow and the part comes out looking literally brand new. Its worth the $95 for the jug. the one draw back with the stuff is that it is TOXIC!! avoid breathing the fumes at all costs.
No disapointments though.
my 2 cents.
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Old 12-13-2005, 10:50 PM
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i have been trying the carb cleaner seems to work ok but havent yet ried any of the lager parts where can you get this safety kleen stuff?
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88 turbo Guards red Targa slant nose, and yes I am a horsepower junkie, Boost freak,Boob freak,
k-27hfs, 3.4liter,7.5 to 1 JE pistons,SSC cams,Adjustable WUR,Imagine fuel head, 1 bar waste gate headers,allthe cis toys. Now apart to become the next EFI monster.
05 Cayenne S lapis blue
Old 12-14-2005, 12:40 PM
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Ken

This is what one of my pistons looks like after 60 seconds in a bead blaster. I had soaked it in parts cleaner for an hour and scrubbed with a wire brush for 20 minutes getting almost nowhere. The rest of them will be done in the bead blaster.


The before was like this
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Old 12-14-2005, 08:44 PM
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I've not done this on a Porsche but on motorcycles I bead blast with very good luck. Like the image above shows, be sure and tape off the ring area. I typically leave skirts unmasked and blast them too. For taping, I prefer duct tape, not only because I am a red neck with plenty o' duck around, but the rubbery surface and good adhesive stays put and deflects the beads quite nicely. Don't ever bead blast parts with oil holes unless you triple check you tape job. Sand in your oil passages is as bad as it sounds.

Have any of you blasted material with walnut shells? Northern Tool sells ground shells and they are supposed to be good for use on internal engine parts as they dissolve in oil/gas and are not as harmful to your engine innards. Anyone have a review?
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Old 12-15-2005, 09:58 AM
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well I dont have access to a bead blaster think the carb cleaner and a toothbrush will do
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88 turbo Guards red Targa slant nose, and yes I am a horsepower junkie, Boost freak,Boob freak,
k-27hfs, 3.4liter,7.5 to 1 JE pistons,SSC cams,Adjustable WUR,Imagine fuel head, 1 bar waste gate headers,allthe cis toys. Now apart to become the next EFI monster.
05 Cayenne S lapis blue
Old 12-16-2005, 05:34 PM
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This won't work for initial cleaning, but for final cleaning, just before you put the thing back togather, use Tide. Just plain Tide and piping hot water. Hot is very important as without it the cleaner isn't activated. Tide is the only detergent favored by the good ole boy network for NASCAR. Please, don't use bleach, leave that to your wife.
Old 12-16-2005, 07:57 PM
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actually for all the aluminum parts i was going to clean them up with brake cleen the when the wife wasnt around toss them in the dishwasher, the pistons are getting the carb cleaner and toothbrush trick which is working pretty well but slow.
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88 turbo Guards red Targa slant nose, and yes I am a horsepower junkie, Boost freak,Boob freak,
k-27hfs, 3.4liter,7.5 to 1 JE pistons,SSC cams,Adjustable WUR,Imagine fuel head, 1 bar waste gate headers,allthe cis toys. Now apart to become the next EFI monster.
05 Cayenne S lapis blue
Old 12-18-2005, 05:32 PM
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CAREFUL!! Some wifes can read. Dangerous, very dangerous into to give out. Never admit to using the dishwasher.
Old 12-18-2005, 05:57 PM
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Old 12-18-2005, 05:57 PM
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