Northern Lights M864W Operator's Manual - page 22
OM864W 09/07
22
COOLING SYSTEM - GENERAL
NOTE: Be sure to close the sea-cock before working
on the engine cooling system.
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
fi ller cap carefully, using protective clothing
when the engine is warm.
SP14. CHECK THE COOLANT LEVEL
1. Check the coolant level each day before starting the
engine.
a. 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 fi ller cap sealing
surface when the engine is cold.
b. The pressure valve in the fi ller cap releases
when the pressure is approximately 7 PSI
(0.5
kg/cm
2
). Use a cap pressure tester to check
cap if you suspect it is faulty.
SP15. COOLING SYSTEM FLUSHING
1. Flush the cooling system every 750 hours or every
12 months, whichever comes fi rst.
2. Remove
fi ll cap and open drains on engine block.
The hex-headed engine block drain is on the service
side of the engine below the intake manifold, next to
the fl ywheel housing.
3. Pour
clean water into the engine until water coming
from engine is clear of discoloration. Close drains and
refi ll the engine with recommended coolant mixture.
4. Use 50% water / 50% ethylene glycol antifreeze
mix. Antifreeze mixture is recommended as a good
year-round coolant.
5. Check hoses and connections and repair any leakage.
6. Start the engine and check for leaks. Run the engine
for fi ve minutes, then shut it down. Let engine cool,
and then check the coolant level in the engine. Add
coolant as needed.
NOTE: Be sure to open the sea-cock after working
on the engine cooling system and starting the
engine.
Servicing