13
OPM-138/B
B. Remove the nut (‘D’) and the retainer (‘E’).
C. Remove the air filter (‘F’).
D. Remove the pre-cleaner (‘G’) from the air filter.
E. To loosen debris, gently tap the air filter on a hard
surface. If the air filter is excessively dirty replace with a
new
filter.
NOTE: Do NOT use pressurized air or solvents to clean the
filter. Pressurized air can damage the filter and solvents will
disolve the filter.
F. Wash the pre-cleaner in liquid detergent and water.
Then allow it to thoroughly air dry. DO NOT oil the pre-
cleaner.
G. Install the pre-cleaner to the air filter..
H. Install the air filter and secure with retainer and nut.
I. Install and secure the cover.
SPARK PLUG
Replace annually or every 300 hours of operation. Always
replace with the same spark plug that came in the engine
and check gap before installing. Spark plug gap is 0.030”.
Poor spark will also occur if spark plug wire does not fit
firmly on spark plug. If this happens, reform the terminal to
fit firmly on spark plug tip.
CARBON CANISTER
Designed to collect, store, and dispose of fuel vapors
created in the fuel tank/fuel system. The canister should last
the life of the unit as long as it stays dry.
C. Remove the oil filter and dispose of it properly.
D. Before you install the new oil filter, clean the filter
mounting base and coat the seal of the new oil filter
will clean engine oil.
E. Install the oil filter by hand until the gasket contacts the
oil filter adapter, then tighten the oil filter 1/2 to 3/4
turns.
F. Replace oil drain bolt making sure the sealing washer is
in
place.
G. Remove the oil filter plug and refill with new oil. Make
sure to use the proper grade oil based on your
operating
temperature.
NOTE:
This engine requires 78 to 80 ounces (2.4 to 2.5
quarts) of oil if it is completely drained. Use caution when
refilling the engine as some residual oil may have remained
in the engine. Always use the dipstick when filling the
engine with oil to prevent overfilling.
H. Replace filter plug.
I. Start the engine and warm it up.
J . After warming up the engine, recheck the oil level and
refill as necessary to bring it to the proper level.
DUAL ELEMENT AIR FILTER
Clean and/or replace the foam pre-cleaner and the air filter
annually or every 100 hours. Service more often under
dusty conditions.
WARNING: EQUIPMENT DAMAGE
Never start or run the engine with the air filter removed.
A. Loosen snaps (‘A’) and remove cover (‘B’).
Neoprene Hose, 1/2” I.D.
Cut to length
11
3110-00
60706-239
ENGINE CARE
If major engine service or repair is required, contact
an authorized engine service center. The manufac-
turer of these engines has established an excellent
world-wide engine service organization. Engine ser-
vice is very likely available from a nearby authorized
dealer or distributor. Check the yellow pages of your
local telephone directory under “Engines-Gasoline”
for the closest engine repair center or ask the dealer
from whom you purchased the power plant.
1.
Change the oil
after the
fi
rst 5 hours of operation
and yearly or 100 hours thereafter under normal op-
erating conditions. Change engine oil every 50 hours
of operation if the engine is operated under heavy
load, or in high ambient temperatures.
a. Start the engine and warm it up, stop the engine
and remove the spark plug wire to prevent it
from accidently being started.
b. Remove oil drain plug at base of the engine
(Ref “B”) and drain the oil into an approved
container.
c. Remove the oil
fi
lter (Ref “C”) and dispose of it
properly.
d. Before you install the new oil
fi
lter, lightly lubri-
cate the oil
fi
lter gasket with fresh clean oil.
e. Install the oil
fi
lter by hand until the gasket
contacts the oil
fi
lter adapter, then tighten the oil
fi
lter 1/2 to 3/4 turns.
f. Replace oil drain plug.
g. Remove oil
fi
ller plug and re
fi
ll with new oil.
Refer to the table on page 5 for the proper
grade of oil based on your operating
temperature.
NOTE: This engine requires 78 to 80 ounces of oil
if it is completely drained. Use caution when re
fi
lling
the engine as some residual oil may have remained
in the engine. Always use the dipstick when
fi
lling
the engine with oil to prevent over
fi
lling.
h. Replace
fi
ller plug.
I. Start the engine and warm it up.
J. After warming up the engine, recheck the oil
level and re
fi
ll as necessary to bring it to the
proper level. See page 5 for proper oil level.
2.
Checking the Oil Level
: The oil level must al-
ways be checked before the engine is started. Take
care to remove any dirt or debris from around the
oil
fi
ll plug before removing. Be sure the oil level is
maintained. Fill to the “
FULL
” mark on the dipstick.
3.
Dual Element Air Filter
: Clean and/or replace
foam pre-cleaner and air
fi
lter annually or every 100
hours. Service more often under dusty conditions.
WARNING: EQUIPMENT DAMAGE
Never start or run the engine with the air filter re-
moved
a. Loosen snaps (Ref “A”) and remove cover.
Ref “B”
Maintenance Chart
First 5 Hours
x
Change oil
Every 8 Hours or Daily
x
Check engine oil level
x
Clean area around muffler and controls
Every 100 Hours or Annually
x
Clean or change air filter *
x
Clean pre-cleaner (if equipped) *
x
Change engine oil and filter
x
Replace spark plug
x
Check muffler and spark arrester
Every 250 Hours or Annually
x
Check valve clearance. Adjust if necessary.
Every 400 Hours or Annually
x
Change air filter
x
Replace fuel filter
x
Clean air cooling system *
x
Clean oil cooler fins *
*
In dusty conditions or when airborne debris is present, clean more often.
A
B
F
E
D
G
C
B
