6600 John Deere Tune-up info needed - The Combine Forum
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Old 09-10-2011, 08:38 PM   #1 (permalink)
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Default 6600 John Deere Tune-up info needed

Hello, my brother-in-law just purchased a 6600 JD combine, with the 303 gas engine. He says it's running a little hot, but other wise runs pretty good, but maybe a little underpowered.
He want's me to help him give it a tune-up.
Does anyone have the tune-up specs for the 303 gas engine?
It's serial number 25099.
Timming, point setting, spark plug type and gap needed.
Thanks, Tom
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Old 09-10-2011, 11:10 PM   #2 (permalink)
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Originally Posted by tomfg View Post
Hello, my brother-in-law just purchased a 6600 JD combine, with the 303 gas engine. He says it's running a little hot, but other wise runs pretty good, but maybe a little underpowered.
He want's me to help him give it a tune-up.
Does anyone have the tune-up specs for the 303 gas engine?
It's serial number 25099.
Timing, point setting, spark plug type and gap needed.
Thanks, Tom
Timing 24* at 2650 RPM operating temperature.

Point gap
Prestolite .020 in.
Delco .016 in

Plug gap .025 in
Sorry dont have a plug number for you. Were several different ones available with different heat ratings.
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Old 09-11-2011, 09:10 PM   #3 (permalink)
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Default Tune up

Thank you kindly Albertabuck
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