Onan NHC Series Operator's/Service Manual And Parts Catalog page 219

OPERATION
B E F O R E STARTING
Crankcase O i l : Be sure the crankcase has been f i l l e d
with o i l to the " F U L L " mark on the o i l level indicator.
Use a good quality o i l with the API (American
Petroleum Institute) designation SE or SE/CC. Do not
use an o i l with the designation CD unless it is also
designated SE and the o i l manufacturer certifies it w i l l
perform satisfactorily in gasoline engines.
Recommended Fuel: Use clean. • fresh, regular grade,
automotive gasoline. Do not use highly leaded premium
types.
For new engines, the most satisfactory results are
obtained by using nonleaded gasoline. For older
engines that have previously used leaded gasoline,
heads must be taken off and all lead deposits removed
from engine before switching to nonleaded gasoline.
CAUTION
// lead deposits are not removed from
engine before switching trom leaded
to nonleaded gasoline, preignition could occur causing
severe damage to the engine.
Never f i l l the tank when the engine is running. Leave
some space in the tank for fuel expansion. Open the
fuel line valve (when used) and operate primer to
assure fuel supply.
STARTING (Electric Start)
1. Move the ignition switch to its ON position.
2. Push the START button to crank the engine.
If the engine fails to start at first attempt, inhibitor
oil used at the factory may have fouled the spark plugs.
Remove the plugs, clean in suitable solvent, dry
thoroughly and install. Heavy exhaust smoke when the
engine is first started is normal and is caused by
inhibitor o i l .
STARTING (Manual Start)
1. Close the choke about three quarters of the way or
as necessary according to temperature conditions.
2. Pull the start rope with a fast steady pull to crank
the engine. Do not jerk.
A P P L Y I N G LOAD
When applying the load to a new or reconditioned
engine, it should be applied gradually in about four
steps; each step of not less than 30 minutes running
time. Start with 1/4 load, then 1/2, 3/4 and f u l l load.
B A T T E R Y CHARGING
The battery charge rate is controlled by a charge
regulator. The regulator is set to allow the proper
rate of charge at operating speed.
STOPPING T H E ENGINE
Disconnect a l l load before stopping the engine; Engines
equipped with battery ignition are stopped by the igni-
tion switch to the OFF position.
air flow to and from
HIGH T E M P E R A T U R E S
1. See that nothing obstructs
the engine.
2. Keep cooling fins clean. Air housing should be
properly installed and undamaged.
LOW T E M P E R A T U R E S
1. Use correct SAE No. o i l for temperature conditions.
Change o i l only when engine is warm.
2. Use fresh f u e l . Protect against moisture conden-
sation.
3. Keep fuel system clean and batteries in a well
charged condition.
4. Partially restrict cool air f l o w , but use care to
avoid overheating.
D U S T A N D D I R T
1. Keep unit clean. Keep cooling system clean.
2. Service air cleaner as frequently as required.
3. Change crankcase o i l and f i l t e r more often than
recommended under normal conditions.
4. Keep o i l and gasoline in dust tight containers.
5. Keep governor linkage clean.
O U T - O F - S E R V I C E P R O T E C T I O N
Protect an engine that w i l l be out-of-service for more
than 30 days as follows:
1. Run unit until thoroughly warm.
2. Turn off fuel supply and run until unit stops.
3. Drain o i l from o i l base while s t i l l warm. R e f i l l
and attach a warning tag stating o i l viscosity used.
4. Remove each spark plug. Pour one ounce (two
tablespoons) of rust inhibitor (or SAE #50 o i l )
into each cylinder. Crank engine slowly (by hand)
several times. Install.spark plug.
5. Service air cleaner.
6. Clean governor linkage and protect by wrapping
with a clean c l o t h .
7. Plug exhaust outlet to prevent entrance of mois-
ture, dirt, bugs, etc.
8. Wipe entire unit. Coat rustable parts with a light
film of grease or o i l .
9. Provide a suitable cover for the entire unit.
10. If battery is used, disconnect and follow standard
battery storage procedure.
90249S
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