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Antique Gas Engine Discussion

Fuller & Johnson 3 HP over speeding the gov


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  #1  
Old 06-18-2005, 11:35:58 AM
Greg-N-CA Greg-N-CA is offline
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Default Fuller & Johnson 3 HP over speeding the gov

I just acquired a Fuller & Johnson 3 HP Model NB. It has developed a problem of over speeding the governor and exceeding its rated speed, firing constantly without coasting. It appeared to be firing BTDC, so I adjusted the timing, but it still races off on me. The governor slides easily and the spring doesn't seem too stiff. Does anyone have any ideas until I can find a manual? Thanks, Greg
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Old 06-18-2005, 12:35:10 PM
BobRR BobRR is offline
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Default Re: Fuller & Johnson 3 HP over speeding the gov

Is it a hit&miss or throttler? If its a throttler sounds like the carb. linkage or butterfly is hooked up wrong? When the engine is stopped the butterfly should be wide open when running the govenor should be pulling it closed.BobRR
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Old 06-18-2005, 01:55:22 PM
Havvey Havvey is offline
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Default Re: Fuller & Johnson 3 HP over speeding the gov

check the weights for wear stinking broken etc
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Old 06-18-2005, 02:40:09 PM
Joe Morris Joe Morris is offline
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Default Re: Fuller & Johnson 3 HP over speeding the gov

If it is a hit and miss there is a good possibility that the latch out lever is not catching the pushrod due to the fact that there is an adjustment needed on the lever by increaseing the distance between the end of the lever and the block on the push rod when the pushrod is at its extreme forward position. In other words if there is not enough clearance the latch out lever cannot get behind the block to catch it thereby the engine " runs away ". let us know what happens . I hope this will help a little . Good luck in a good hobby
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Old 06-18-2005, 07:33:22 PM
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Ken Majeski Ken Majeski is offline
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Default Re: Fuller & Johnson 3 HP over speeding the gov

Well... Thats what I call a Dingey Ball engine.... ( Not My Favorite F&J) Turn the engine over untill the pushrod is all the way toward the head and the Dingey ball is in about the 10 O-clock position. Then pull outward on the ball and see if the latch goes into the notch... If it does not go in you may have to adjust the ball rod where is goes into the cam behind the flywheel. Also check to be sure the latch out arm is not worn too much as that will keep it from moving far enough to hook up.

Also if the timing gears are not meshed propery it may be too far out of Time to latch up when the ball moves outward but still close enough to run. That governor although not the best will work.... Good Luck...
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Old 06-19-2005, 07:05:42 AM
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Post Re: Fuller & Johnson 3 HP over speeding the gov

Here's how to properly adjust the governor, scanned right from an original manual. If this doesn't solve the problem then your trouble is wear in the governor mechanism.



Cheers NICK
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Old 06-19-2005, 09:40:21 AM
Greg-N-CA Greg-N-CA is offline
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Default Re: Fuller & Johnson 3 HP over speeding the gov

Thanks everyone! A special thanks to you Nick, by reading the page you sent me I can see that I need to grind the end of the detent finger. From my observations yesterday, I noticed that there is not the required clearence between the finger and catch.

Could you scan and send me the page on timing the mag? I think it's still not set just right. Thanks for the help, Greg
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