4--1
62--11161
SECTION 4
COOLING SYSTEM
4.1 CHECKING AND ADJUSTING
4.1.1 V--Belt Tension
1. Measure the deflection
(A)
, by depressing the belt
halfway between the fan drive pulley and alternator
pulley at the specified force (Refer to1.6.3).
2. If the tension is not within the factory specifications,
loosen the tensioner mounting bolts and adjust the
belt tension.
Use of a belt tension gauge (Carrier Part #
07--00203--00) or a belt tension tester (Carrier Part #
07--00253--00) is advised.
(A)
(B)
4.1.2 Fan Belt Damage and Wear
1. Check the fan belt for damage.
2. If the belt is damage in any way, replace it.
3. Check if the belt is worn and sunk in the pulley groove.
4. If the fan belt is worn and deeply sunk in the pulley
groove, replace it.
A
. Good
B.
Bad
4.1.3 Checking Coolant Level
NOTE
When the engine is installed in an APU, follow
OEM vehicle instructions as to checking/adjust-
ing engine coolant levels.
1. Turn the engine off.
WARNING
When removing the radiator cap, wait at
least ten minutes after the engine has
stopped and cooled down. Otherwise, hot
water may discharge from the radiator,
scalding anyone nearby.
2. Remove the radiator cap and check to see that the
coolant level is just below the port.
With the recovery tank: Check to see that the coolant
level lies between
FULL
and
LOW
.
FULL
LOW
3. If the coolant level is too low, check the reason for the
lost coolant.
a. If coolant loss is due to evaporation, add only clean
soft water.
b. If coolant loss is due to a leak, repair the leak and add
a coolant mixture of the same type and specification
that is in the system. If the coolant brand cannot be
identified, drain out all of the remaining coolant and
refill with a totally new mix.
NOTE
When adding coolant to the system, air must be
vented from the engine coolant passages by jig-
gling the upper and lower radiator hoses.
When the engine is installed in an APU, An air
bleed screw is provided in the thermostat hous-
ing.
Be sure to close the radiator cap securely. If the
cap is loose or improperly closed, coolant may
leak out and the engine could overheat.
Do not use an antifreeze and scale inhibitor at
the same time.
Never mix different types or brands of coolants.
