21
ENGINE CARE
Cleanliness
Always keep the outside of your engine clean.
Fuel
Use clean, fresh fuel and keep your fuel can, pump, and fuel system free from dirt.
Model fuel contains alcohol, which is hydrophilic (it attracts moisture from the atmosphere). If the fuel container is kept open
it will absorb water from the air, contaminating the fuel and possibly causing corrosion of the internal engine parts.
After-run Oil
After each running session, run the engine until all fuel is used up, and then disconnect the fuel line from the carburetor. Put
4-5 drops of after-run oil (Marvel Mystery Oil, Prather, Pacer, etc.) into the carburetor and turn the engine by hand several
times to coat the internal engine parts with oil. This will protect the engine bearings and internal parts from corrosion.
The use of after-run oil is also important during periods of prolonged storage (such as winter):
• Remove the engine from the model.
• Liberally apply oil into the carburetor and glowplug hole.
• Wrap your engine in a soft cloth and store it in a sealed plastic bag.
Engine Disassembly
Do not dismantle your engine unnecessarily as this may upset precision fits such as piston/cylinder and crank pin/connecting
rod assembly.
Piston Stuck at top of cylinder – Top Dead Center (TDC):
A brand new engine that has not had a lot of break-in will typically have a very tight fit between the piston and the top of
the cylinder (known as "pinch
"
), since the cylinder has a tapered fit. The fit should not be so tight that then engine cannot be
started. If the piston gets stuck at TDC, use a pair of pliers to grasp the flywheel from the bottom of the engine. Rotate the
flywheel CCW (viewed from the front of the engine) until the flywheel turns; you should feel the piston become unstuck from
the top of the cylinder.
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