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COOLING SYSTEM: The Continental engine, gaso-
line or diesel, is water cooled. Check the coolant level
at the radiator filler daily. Add a 50-50 mixture of water
and antifreeze as needed. To drain and refill the sys-
tem, do the following:
1. Ensure that the machine is on level ground.
To avoid personal injury, never remove the radiator
pressure cap nor the reserve tank cap while the engine
is running or immediately after it has stopped. Hot
water may gush out, which can scald people nearby.
2. Remove the radiator filler cap.
3. Remove the drain plug from the side of the cylinder
block in order to drain the engine. Ensure that the
drain hole is not restricted. See Figure D.4.
4. Open the radiator drain cock at the bottom of the
radiator in order to drain the radiator.
5. If necessary, flush the system with clean water.
6. Fit the engine drain plug and the radiator drain cock.
7. Fill the cooling system at the radiator filler with a 50-
50 mixture of water and antifreeze.
SPARK PLUGS (Gasoline Engine - Classic III):
Clean or replace the spark plugs after every 250 hours
of operation as follows.
1. Before removing the plugs, clean the base area to
keep dirt from falling into the engine through the
plug hole.
2. Remove and inspect the plugs. Plugs showing
signs of fouling or electrode wear should be
replaced. Do not blast the spark plugs clean with an
abrasive cleaning device. Clean the plugs by scrap-
ing or by using a wire brush. Wash the plugs with a
commercial solvent.
3. After cleaning or when installing a new spark plug,
set the terminal gap with a feeler gauge or gapping
tool. See Figure D.5.
Gap Specifications: 0.032 inch (.8 mm).
4. Tighten plugs to 30 ft·lbs (40 N·m).
MAINTENANCE
D-6 D-6
Classic III and IIID
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WARNING
FIGURE D.4 – ENGINE COOLANT DRAIN PLUG AND RADIATOR DRAIN COCK
FIGURE D.5 – SET SPARK PLUG GAP