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Minneapolis Moline Tractors Discussion Forum
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Dieseling 403

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Jerry Cent. Mi.

09-26-2005 05:11:08




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I am pulling with a 403 with a 1/8 inch overbore and 4210 heads. I am running regular gas an have lots of power but I am experiencing a lot of dieseling when I shut it off. I have changed the timing and mixture with now results. Any suggestion would be helpful. Thank you and God bless America. Jerry




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Mopower

09-27-2005 08:47:35




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 Re: Dieseling 403 in reply to Jerry Cent. Mi., 09-26-2005 05:11:08  
We had the same issue on the M5. It seemed to run fine, but Dad put 4209 heads on it instead. It lost some power. I never ran high octane gas in it to see if it would not do that. Your 403 should be running healthy now but not sure what to do to combat the dieseling except run fancy fuel. Polishing things up inside could help.



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Andy2

09-26-2005 15:03:24




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 Re: Dieseling 403 in reply to Jerry Cent. Mi., 09-26-2005 05:11:08  
TOO much compression for pump gas. Start blending high octane, e-85 or switch to LP. If it's dieseling it's probably detonating as well. change something or you could have a short engine life.



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ejr-IA.

09-26-2005 10:52:46




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 Re: Dieseling 403 in reply to Jerry Cent. Mi., 09-26-2005 05:11:08  
403 with 4210 heads is 9to1 336 is 8to1.Can you get it to idle slower and let it cool down before you shut it off that will help.



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Dieselbear

09-26-2005 09:38:02




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 Re: Dieseling 403 in reply to Jerry Cent. Mi., 09-26-2005 05:11:08  
you need to raise the octane level. go to straight Cam2 or start mixing with high test gas



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Kelvin

09-26-2005 09:22:54




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 Re: Dieseling 403 in reply to Jerry Cent. Mi., 09-26-2005 05:11:08  
Well no wonder! IF it were a 336 it would have about 9:1 compression AND it would still diesel-at least Mom's M5 does. on a 403 the compression ratio would be even higher. Choke it down.



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