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Registered User
Join Date: Aug 2002
Location: Tucson AZ
Posts: 1,071
Question clean or dont clean top of pistons

Iam sure I know the answer to this ,..but since my head is off the car should you attempt to clean the tops of the pistons (I say ??? No). Or is it ok as long as you get all the carbon out of the cylinders....FM
Old 10-07-2010, 08:50 PM
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KEV951's Avatar
Join Date: Jan 2009
Posts: 412
leave alone unless something looks like its protruding up out of the top and will hit the valves, haha, you are risking contamination and you might mess up the deck surface if you gouge or scratch it !! just keep everything sealed and away from moisture
Old 10-09-2010, 05:48 PM
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chudson's Avatar
Join Date: Sep 2009
Location: Mount Pleasant, SC
Posts: 120
I could type a huge list of credentials here but I won't. Let me just say that I have been in the import repair industry for 40 years and unless there is some Porsche expert that can present a valid argument to the contrary I always clean the top of my pistons. Pieces of carbon can create hot spots that can cause pre-ignition in the combustion chamber. I clean each piston with it positioned at the top of the cylinder using solvent and small wire brush. I would duplicate the same process to the cylinder head unless a machine shop is doing it for you. It's not necessary to scrub it spotless, just remove all the carbon. After cleaning the pistons you can rotate the crankshaft to reposition the piston and wipe excess residue off of the cylinder walls (solvent will get between the piston and wall above the top ring). One should ALWAYS change the oil and filter before restatring the engine after the head is reinstalled.
Old 10-09-2010, 06:30 PM
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