4 HP Fairbanks-Morse Type T

By Staff
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The 4 HP Fairbanks-Morse Type T owned and restored by Marcus Mason, Fielding, Utah.
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A closer look at the cylinder head and valves on Marcus’ 4 HP Type T.
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Marcus installed a new guide for the intake valve.
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Manufacturer: Fairbanks, Morse & Co., Beloit, Wis.  
Model: Type T
Horsepower: 4
Bore: 5-inch
Stroke: 8-inch
Flywheel diam.: 24 inches
Flywheel width: 2-1/2 inches

If I had all the original parts for this 4 HP Fairbanks-Morse Model T, it would have stayed all original, but I had to work with what I had.

I had the block, flywheels, crank, piston, connecting rod, camshaft roller and pinion gear, but I needed to come up with the cylinder, head, valves, rocker arm, rocker arm bracket, pushrod, pushrod end, camshaft gear, governor assembly, magneto and other various pieces.

The cylinder I used was made out of 5-inch high carbon steel pipe. I welded a flange on each end to mount to the block and head. I also threaded the top end for a spark plug and lower end for an oiler.

I was able to find an original head, but the valve guide for the intake was broken off. There are three holes in the head where a cover fit over the intake valve, and I installed a new valve guide on the head. It bolted right on where the valve guide cover used to be.

I was told that the rocker arm and rocker arm bracket from a Fairbanks-Morse 4 HP Type H would work on a Type T. It did work but I had to modify the end of the pushrod where it connects to the rocker arm, making the new connector out of 1-inch round stock. It had to be modified this way so the pushrod lined up properly between the rocker arm and camshaft roller. 

I found an original camshaft gear and governor assembly. The camshaft was replaced with 1-1/8-inch round stock. The old exhaust camshaft lobe was reused on the new camshaft. On the end of the camshaft was a pin that worked the igniter. This pin was replaced with a gear to run a Fairbanks-Morse R magneto for spark to the spark plug. I get a spark right where I should, just a little after top dead center on the compression stroke. Add a nice cart, some paint and there you have it.

Contact Marcus Mason at 212 S. Center St., Fielding, UT 84311 • jakebuddy01@yahoo.com

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