Engine Maintenance
63
Antifreeze Maintenance Procedure
As with all equipment containing antifreeze,
periodic inspection on a regular basis is required
to verify the condition of the antifreeze. Inhibitors
become worn out and must be replaced by
changing the antifreeze. Change green or
blue-green engine coolant every two years.
Change ELC (red) engine coolant every five years
or 12,000 hours (whichever occurs first).
Do not mix green or blue-green engine coolant
with ELC (red) engine coolant. See “ELC
(Extended Life Coolant)” on page 62 for more
information about ELC.
The factory recommends the use of a 50/50%
antifreeze mixture in all units even if they are not
exposed to freezing temperatures. This antifreeze
mixture will provide the required corrosion
protection and lubrication for the water pump.
Checking the Antifreeze
Check the solution concentration by using a
temperature compensated antifreeze hydrometer
or a refractometer designed for testing antifreeze.
Maintain a minimum of 50% permanent type
antifreeze concentrate and 50% water solution to
provide protection to -30 F (-34 C). Do not mix
antifreeze stronger than 68% permanent type
coolant concentrate and 32% water for use in
extreme temperatures.
Changing the Antifreeze
1. Run the engine until it is up to operating
temperature. Stop the unit.
2. Open the drain cock (see Figure 34 on page
61) and completely drain coolant. Observe
coolant color. If the coolant is dirty, proceed
with a, b, and c. Otherwise go to step 3.
a. Run clear water into radiator and allow it
to drain out of the drain cock until it is
clear.
b. Close the drain cock and install a
commercially available radiator and block
flushing agent, and operate the unit in
accordance with instructions of the
flushing agent manufacturer.
c. Open the drain cock to drain water and
flushing solution.
3. Run clear water into the radiator, and allow it
to drain out of the drain cock until it is clear.
When water has finished draining, close drain
cock.
4. Inspect all the hoses for deterioration and the
hose clamp tightness. Replace if necessary.
5. Loosen the water pump belt. Check the water
pump bearing for looseness.
6. Inspect the radiator cap. Replace the cap if the
gasket shows any signs of deterioration.
7. Mix one gallon of the appropriate permanent
type antifreeze concentrate and one gallon
clean water in a container to make a 50/50
mixture. (Do not add antifreeze and then add
water to the unit. This procedure may not give
a true 50/50 mixture because the exact cooling
system capacity may not always be known).
8. Refill the radiator with the 50/50 mixture.
Bleeding Cooling System
After filling the radiator, run the unit up to
operating temperature to check for overheating
and coolant level and allow the air to be purged
for a few minutes.
CAUTION: Avoid direct contact with hot
coolant.
CAUTION: Avoid direct contact with hot
coolant.
CAUTION: Do not remove the radiator
cap while the engine is hot.
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Страница 66: ...Engine Maintenance 66 Figure 37 Fuel and Oil System Components...
Страница 84: ...Engine Maintenance 84...
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Страница 143: ...143 Truck S Model 30 Units with P T Wiring Diagram Page 1 of 2...
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Страница 145: ...145 Truck S Model 50 Schematic Diagram Page 1 of 2...
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Страница 147: ...147 Truck S Model 50 Units with P T Wiring Diagram Page 1 of 2...
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