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Adjusting the Valve Lash
The valve lash must be checked every 100 hours of
operation. Measure valve clearance with the engine cold.
To adjust the valve lash, proceed as follows:
1. Turn crankshaft counterclosckwise until piston is at
top dead center on the compression stroke. This
prevents the compression release from holding the
valves open.
2. Insert a narrow screwdriver or rod into the sparkplug
hole as a gauge, then slowly turn crankshaft
counterclockwise until the piston has moved down
the bore by 1/4".
3. Using a feeler gauge (A, Figure 9), adjust the rocker
nut to obtain the correct clearance as listed below:
• Intake - 0.003 - 0.005 in. (0.08 - 0.13 mm)
• Exhaust - 0.005 - 0.007 in. (0.13 - 0.18 mm)
4. Hold rocker nut and tighten the rocker ball setscrew
(B) to 45 lb-in. (5 Nm).
Figure 11
5. Check clearance again and readjust, if necessary.
6. Repeat for the other valve.
Replacing the Spark Plugs
Replace the spark plugs every year. Use only the
recommended spark plugs and make sure they are gapped to
0.030 in. (0.76 mm).
1. Stop the engine and disconnect the wires from the
spark plugs.
2. Clean around the spark plugs and remove them from
the cylinder head.
3. Inspect the spark plugs for wear or damage - replace
as necessary. DO NOT blast clean.
4. Set the gap as specified above and install the cleaned
or new spark plugs into the cylinder heads. Torque
to 180 lb-in. (20 Nm).
Oil Service
Checking the Oil Level
Check the engine oil level as follows:
1. Remove the roof to the unit to access the oil fill and
dipstick locations.
2. Remove dipstick. Wipe with clean cloth.
3. Insert and rotate dipstick fully to locked position.
Remove and check oil level.
If oil level is low, remove the oil fill cap and slowly add
recommended oil to bring level to the FULL mark on the
dipstick.
Changing the Oil and Oil Filter
Oil capacity is approximately 2-1/2 quarts (80 ounces or 2.3
liters) when changing both the oil and oil filter. Use only 5W-
30 full- synthetic detergent oil rated for service SJ or higher.
This allows for system operation in the widest range of
temperature and climate conditions.
CAUTION Avoid prolonged or repeated contact with
used motor oil.
•
Used motor oil has been shown to cause cancer in
certain laboratory animals.
•
Thoroughly wash exposed areas with soap and
water.
KEEP OUT OF REACH OF CHILDREN. DON'T
POLLUTE. CONSERVE RESOURCES. TAKE
USED OIL TO COLLECTION CENTERS.
Change oil and oil filter after every 100 hours of operation. If
the unit is run under dirty or dusty conditions or in extremely
hot weather, change the oil more often.
Use the following instructions to change the oil while the
engine is still warm.
1. Set control panel system switch to OFF.
2. Remove the 15 Amp fuse.
3. Gain access to oil drain hose. It is located inside the
access cover on the side panel (Figure 10).
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