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Rich Biebel · 01-27-2016, 09:32 AM

Onan made a product to carbon clean engines. 4C cleaner, and you sprayed it in the carb of a running engine. Similar smell as the GM cleaner and some other products you could buy. Bluish white smoke poured out the engine. It did help but definitely not as effective as removing the heads and carbon cleaning the engine.

An Older Onan flathead engine can literally stop turning over from the carbon buidup. Took a machine out of a support vehicle at the World Trade Center site after 9/11 that did.
We put in a new generator but the old one was just locked up from carbon on top of the pistons.....No time to waste there....

The stuff was easily the best carb cleaner as it dissolved pretty much anything in carb passages.

None of these products are still available and I tried to hunt down a case of 4C a while ago.....None available and no longer made.

Tried a lot of other chemicals....Mopar made a carbon cleaner too but I don't think they sell it anymore either....

SeaFoam works but nowhere near as well.....

01-27-2016, 09:32 AM	#4
Rich Biebel VIP Member Join Date: Jun 2007 Location: Northern New Jersey suburbs Posts: 2,315 Likes: 25 Liked 544 Times in 213 Posts	Re: Lapping piston rings Onan made a product to carbon clean engines. 4C cleaner, and you sprayed it in the carb of a running engine. Similar smell as the GM cleaner and some other products you could buy. Bluish white smoke poured out the engine. It did help but definitely not as effective as removing the heads and carbon cleaning the engine. An Older Onan flathead engine can literally stop turning over from the carbon buidup. Took a machine out of a support vehicle at the World Trade Center site after 9/11 that did. We put in a new generator but the old one was just locked up from carbon on top of the pistons.....No time to waste there.... The stuff was easily the best carb cleaner as it dissolved pretty much anything in carb passages. None of these products are still available and I tried to hunt down a case of 4C a while ago.....None available and no longer made. Tried a lot of other chemicals....Mopar made a carbon cleaner too but I don't think they sell it anymore either.... SeaFoam works but nowhere near as well..... __________________ Rich Biebel S/C 1479 Stock 147R Last edited by Rich Biebel; 01-27-2016 at 09:37 AM.