from the August 1995 issue of the
Gas Engine Magazine
Hercules Engine News
Including Economy, Arco,
Jaeger & Thermoil
by Glenn Karch
20601 Old State Road
Haubstadt, Indiana 47639 .
system on Hercules built hit and miss engines is rather simple, but a few
comments are in order. nowadays many original engines have rusted or
gummy fuel tanks. Starting off with a new fuel tank is likely the
best option rather than patching, using sloshing material or using
solvents to remove gum. Ready-made new tanks up to the 7-8 HP size
are available from several suppliers. Be sure that the replacement
tank has a vent on the top; otherwise, gas will bubble out when filling
Tanks were held in the engine base with a
combination of wires and rods, although the design changed somewhat
between the older and new models. If the fuel spout is missing,
replacements are available on the used parts market, and new ones with the
flip top lid are available from some suppliers for the 1 1/2 - 2 HP size
For more trouble free operation, the fuel supply
pipe should have a fine mesh bras screen soldered into the end of the pipe
to keep out dirt particles that may be in the fuel tank.
Check valve sticking is becoming more of a
problem. Apparently, modern day gasoline tends t gum up more easily
as it ages compared to the regular leaded gasoline of several years
ago. Drain the tank between seasons.
To get good tight connections, it is best to use
new brass fittings and new tubing for the supply line to the fuel mixer.
The fuel adjustment valve should have a good
clean smooth point. If needed, a new valve can be made from ready
bolt or the old one can be put in a lathe and the point redressed.
The valve seat rarely requires attention other than to see that the hole
to the supply line is open.
The accompanying illustration shows some of the
features mentioned above.
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