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Hit & Miss Gas Engine Discussion

10 hp Fairbanks Morse Z Won’t Start


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  #1  
Old 01-15-2018, 04:27:33 PM
Martin in Ca. Martin in Ca. is offline
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Default 10 hp Fairbanks Morse Z Won’t Start

Gentlemen, I recently inherited my fathers FBM 10 HP Z engine. While dad was alive I had it running but had a fuel leak that I have since repaired. After sitting for a few months I canít seem to get it to start. The timing is right, the fuel is good and I have good spark at the Plugoscillator. I did have the magnets recharged and checked out at a local shop. As far as I can tell everything is set correctly but it isnít starting. Can anyone offer some advice? Thanks for any help!
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Old 01-15-2018, 04:45:29 PM
Andrew Mackey Andrew Mackey is offline
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Default Re: 10 hp Fairbanks Morse Z wonít start

Are you manually choking until fuel runs out the intake? if not, do so and see what happens. If no-go, remove the igniter assembly and see if it is wet with fuel. If so, fuel will conduct electricity when under compression - you will lose spark. You will need to dry off with a propane torch and make sure there is no carbon on the isolated contact mount. How old is your gas? if more than 30 days, drain and replace it.
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Old 01-15-2018, 05:19:06 PM
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Ray Cardoza Ray Cardoza is offline
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Default Re: 10 hp Fairbanks Morse Z wonít start

also try using a battery and coil instead of just the mag.
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Old 01-15-2018, 05:36:21 PM
Andrew Mackey Andrew Mackey is offline
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Default Re: 10 hp Fairbanks Morse Z wonít start

If you do that, make sure to disconnect the mag from the ignitor circuit!
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Old 01-15-2018, 09:31:11 PM
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Ed Noli Ed Noli is offline
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Default Re: 10 hp Fairbanks Morse Z Wonít Start

If you go with the battery and coil, the points need to be adjusted from normally closed to normally open.
Are you testing for spark with the assembly off the engine?
The mag armature needs to rotate 30 degrees before it trips. I'm guessing the plugoscillator was assembled and adjusted after the mag was off for charging. My thought is the bell crank and trip finger need to be readjusted to achieve the 30į rotation at the mag when it trips.
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Old 01-15-2018, 09:55:43 PM
Martin in Ca. Martin in Ca. is offline
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Default Re: 10 hp Fairbanks Morse Z Wonít Start

Thanks for the replies. Ill check it when I get to the shop in the morning. Ill let you know what happens!
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Old 01-16-2018, 03:01:58 AM
S.Simons S.Simons is offline
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Default Re: 10 hp Fairbanks Morse Z Wonít Start

What type of mag works on this bracket ?
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Old 01-16-2018, 07:18:25 AM
Heavy Metal Heavy Metal is offline
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Default Re: 10 hp Fairbanks Morse Z Wonít Start

S.Simons - That looks like the bracket for a Sumter #14 Plugoscillator.

Here's a video of a 3hp with the Plugoscillator on it. https://youtu.be/yErP0PJHCm8
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Old 01-16-2018, 12:32:18 PM
Martin in Ca. Martin in Ca. is offline
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Default Re: 10 hp Fairbanks Morse Z Won’t Start

Can you give me a rough idea how many turns the valve on the mixer should be opened?
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Old 01-16-2018, 07:03:22 PM
Chris Steffen Chris Steffen is offline
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Default Re: 10 hp Fairbanks Morse Z Won’t Start

Martin, I'm in Hughson if you need help........I sent you a PM with my number.

Last edited by Chris Steffen; 01-16-2018 at 08:44:57 PM.
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Old 01-19-2018, 09:55:03 PM
Martin in Ca. Martin in Ca. is offline
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Default Re: 10 hp Fairbanks Morse Z Won’t Start

Thanks for all the suggestions we now have a running engine! As Ed suggested the armature was not rotating 30 degrees before snapping. I took it to our local antique tractor and engine expert Andrew Hinkle who made the necessary adjustments and double checked the magnets and it fired right off. Thanks again for all the help!
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