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Hit & Miss Gas Engine Discussion

Installing the Piston in an FM-Z 3HP

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Old 05-25-2007, 11:14:38 PM
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Harry Harry is offline
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Default Installing the Piston in an FM-Z 3HP

The Fairbanks Morse 3 horsepower Z engine of 1918 has a set of three rings pinned on its lower side. To install the piston, turn the piston bottom side up and wiggle the rings in past the tapered edge of the cylinder. Then turn the rod right side up so as to have the piston pin's oil hole at the top of the cylinder.

There is a wider section of the cylinder toward the head from the ignitor hole. Although this section also has a tapered edge, be careful that you don't let the piston rings slip past this point. (At t.d.c. the front of the piston projects about a quarter of an inch past this ridge!) If you can't wiggle and coax it back, you'll need to remove the head to extract the piston through the head end. When this happens on a headless engine, that's a true definition of S.O.L.

All finished and ready to fuel it up! an ignitor clamp is on the way from Hit 'n Miss.
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Old 05-26-2007, 08:11:44 AM
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David M. Lyon David M. Lyon is offline
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Default Re: Installing the Piston in an FM-Z 3HP

Nice lookin' engine Harry! ...I like those Fairbanks-Morse products...
I have learned the hard way to never take the rod loose from the crank on a headless engine...I pull them out, and put them back in as an assembly so that the piston can't travel too far into the cylinder...It's a little trouble but it saves a WHOLE LOTTA' TROUBLE...
Send us a short movie when you fire it up...I wanna' hear it run.
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Old 05-26-2007, 09:33:36 AM
Kevin O. Pulver Kevin O. Pulver is offline
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Default Re: Installing the Piston in an FM-Z 3HP

That's gorgeous Harry!
Nice work.
Remember the GEM story of the guy who had to saw the "head" off his Tom Thumb? He was able to drill some holes and bolt it right back on.
(Don't try this at home- your mileage may vary)
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Old 05-26-2007, 11:15:49 PM
DirtbikePilot DirtbikePilot is offline
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Default Re: Installing the Piston in an FM-Z 3HP

I second the request for a movie!!!! One at least 20 seconds long would be great.
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