ONL843NW4 11/13
20
Servicing
2. Here are acceptable water quality specifications:
3. If chlorides, sulfates or total dissolved solids are
higher than the above given specification, the water
must be distilled, demineralized, or
deionized before it is used in a cooling system.
4. If total hardness is higher than 170 ppm and all other
parameters are within the given
specifications, the water must be softened before it is
used to make coolant solution.
SP13. CHECK THE COOLANT LEVEL
1. Check the coolant level each day before starting the
engine. Check the water level by removing the
pressure cap from the radiator. In order to give the
cooling water an opportunity to expand, the level
should be about 1 in. (2.5 cm) below the filler cap
sealing surface when the engine is cold.
2. The pressure valve in the filler cap releases when the
pressure is approximately 7 PSI (0.5 bar). Use a cap
pressure tester to check cap if you suspect it is faulty.
SP14. COOLING SYSTEM FLUSHING
1. Flush the cooling system every 2500 hours or every
12 months, whichever comes first.
2. Industrial sets:
a. Remove radiator cap and open radiator drain and
drain engine block.
b. Pour clean water into radiator until water
coming from radiator is free of discoloration and
sediment.
c. Close the radiator drain and continue flushing
until water from the engine drain is clear.
d. Open all drain cocks and drain completely.
e. Close drain cocks and refill with recommended
coolant.
f. Clean leaves, dust, and other debris off the
radiator fins.
3. Coolant Specifications:
Use 50% distilled water / 50% ethylene glycol anti-
freeze mix. Antifreeze mixture is recommended as a
good year-round coolant.
4. Check hoses and connections and repair any leakage.
SP15. CLEAN RADIATOR
1. Remove debris from radiator fins daily.
2. In very dusty applications, clean the radiator with
compressed air or steam cleaner every 100 hours.
and check for leaks.
GENERATOR ENDS
The maintenance and operation recommendations
for the generator end are in a separate Owner’s
Manual. If you do not have one of these manuals,
contact your local Northern Lights dealer.
ELECTRICAL SYSTEM - GENERAL
1. Never switch battery switch off or break the circuit
between the alternator and batteries while the engine
is running. Alternator damage can result.
2. Do NOT reverse the polarity of battery cables when
installing the battery.
3. If welding on the unit, disconnect the regulator and
battery. Isolate the leads.
4. Disconnect the battery cables when servicing the
D.C. alternator.
5. Never test with a screwdriver, etc., against any ter-
minal to see if it emits sparks.
6. Do not polarize the alternator or regulator.
7. The D.C. circuit breaker protects your control panel
and wiring harness. It is located in the side of the
generator junction box.
GLOW PLUGS
1. Each cylinder is supplied with a glow plug which
serves to heat the combustion chamber.
2. To check the glow plugs, loosen the current
carrying flat wire between the plus-poles of the
glow plugs (
Figure 18
). Connect a D.C. test bulb
between the plus-pole of the battery and the
plus-pole of the glow plug. If the bulb lights up,
the glow plug is functioning properly.
3. Check all glow plugs and replace any faulty ones.
Parts Grains
Contaminates
per Million per Gallon
Maximum Chlorides
40
2.5
Maximum Sulfates
100
5.9
Maximum Dissolved Solids
340
20.0
Maximum Total Hardness
170
10.0
PH Level 5.5 to 9.0
revised 11-8-13
