24
ONL844T4E 3/18
Servicing
COOLING SYSTEM - GENERAL
CAUTION: The cooling water in the engine
reaches extremely high temperatures. You must
use extreme caution when working on hot
engines to avoid burns. Allow the engine to cool
before working on the cooling system. Open the
filler cap carefully, using protective clothing
when the engine is warm.
SP13. CHECK THE COOLANT LEVEL
1. Check the coolant level each day before starting the
engine. Check the water level by removing the pres-
sure 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.
SP 14. 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 the 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 cock and refill with recommended
mixture.
f. Clean leaves, dust, and other debris off the
radiator fins.
3. Coolant Specifications:
Use 50% distilled water / 50% ethylene glycol
antifreeze mix. Antifreeze mixture is recommended
as a good year-round coolant.
4. Check hoses and connections and repair any leakage.
SP 15. 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 recommenda-
tions for the generator end are in Owner’s Manual
OPX300K2. To obtain one of these manuals, contact
your local Northern Lights dealer or www.northern-
lights.com.
