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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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#14331 04/18/2004 8:26 PM | Joined: Apr 2004 Posts: 72 Wrench Fetcher | | Wrench Fetcher Joined: Apr 2004 Posts: 72 | I have aquired a set of NOS pistons for my 270 GMC rebuild and they are all coated with what I think is called "cosmolene". It is sort of a wax based protectant that each piston has been dipped in to preserve it. Anybody got a reall good method for removing this stuff? Someone had partially cleaned one of the pistons and I finished it up with some Naptha and a tooth brush. It took quite a while to get it clean. There must be something else I can use. What say you????
52 GMC Suburban...52 Chevy 3/4 ton...49 CHevy 1/2 ton Rod...49 GMC 1/2 ton retro rod project
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#14332 04/18/2004 11:15 PM | Joined: Mar 2004 Posts: 3,068 'Bolter | | 'Bolter Joined: Mar 2004 Posts: 3,068 | Take them to a shop that has a hot water parts washer. The solvent in the water and the heat should clean them right up.
Scott | | |
#14333 04/19/2004 6:24 PM | Joined: Oct 2001 Posts: 3,458 Extreme Gabster | | Extreme Gabster Joined: Oct 2001 Posts: 3,458 | Diesel fuel or Kerosene works well on cosmolene. Don't use gasoline.
Paint & Body Shop moderator
A lone amateur built the Ark. A large group of professionals built the Titanic. | | |
#14334 04/20/2004 5:05 AM | Joined: Apr 2004 Posts: 72 Wrench Fetcher | | Wrench Fetcher Joined: Apr 2004 Posts: 72 | I'll try the kerosene. I think I have some around here somewhere. Maybe out in the shed. Thanks
52 GMC Suburban...52 Chevy 3/4 ton...49 CHevy 1/2 ton Rod...49 GMC 1/2 ton retro rod project
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#14335 04/20/2004 5:21 AM | Joined: Feb 2001 Posts: 1,897 Member | | Member Joined: Feb 2001 Posts: 1,897 | Solvent or brake cleaner will work. Let it soak and wipe off. repeat if neccessary 
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