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Farmall 400D, Idle Speed

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Jim Allen

04-13-2007 13:36:25

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When running on gas for startup, what rpm the engine running on a 400 diesel? I don't see that spec in the manual, ust a 600 rpm idle speed on diesel. Or is it the same?

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Jim Allen

04-14-2007 05:13:45

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Re: Farmall 400D, Idle Speed in reply to Jim Allen, 04-13-2007 13:36:25

Thanks gents. I was trying to figure out how it worked on a tractor I just saw. I didn't see a throttle on the carb so I wondered.

Jim

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georgeky

04-14-2007 09:51:10

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Re: Farmall 400D, Idle Speed in reply to Jim Allen, 04-14-2007 05:13:45

Jim I put the new tach cable that had been in a box for months on my 450 diesel this morning so I could tell you what rpm it is running. On gas it is showing right at 800 rpm as D Slater suggested. There is no throttle for the carb.

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D Slater

04-13-2007 16:14:55

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Re: Farmall 400D, Idle Speed in reply to Jim Allen, 04-13-2007 13:36:25

Don't know what RPM is called for, I set them around 800 to 900 RPM. If you need to change your speed adjust the air valve height on the carburetor. Carburetor has to be removed to do it and its there on top. Gap should be set no closer than 3/32 and no wider than 7/64. If there's a problem with idle make sure everything else is set correct before adjusting.

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Janicholson

04-13-2007 15:08:18

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Re: Farmall 400D, Idle Speed in reply to Jim Allen, 04-13-2007 13:36:25

There is no spec because there is no adjustment. The engine runs on a small open venturi, no throttle plate. The speed depends on richness. The only control is a choke which needs typical feathering to get starting underway. Making it run as fast as it can on that small carb is the goal. It allows fastest warm up and switch to Diesel. JimN

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georgeky

04-13-2007 15:08:10

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Re: Farmall 400D, Idle Speed in reply to Jim Allen, 04-13-2007 13:36:25

Jim, the only thing my book shows says 625 rpm low idle speed.

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