Section 05: COOLING SYSTEM
PA1562
4
FIGURE 4: SURGE TANK (WITH DDC S60) 05115
FIGURE 5: SURGE TANK (WITH VOLVO D13) 05143
2. MAINTENANCE
2.1 GENERAL RECOMMENDATIONS
A systematic routine inspection of cooling
system components is essential to ensure
maximum engine and heating system efficiency.
• Check coolant level in the surge tank daily,
and correct if required. Test antifreeze
strength.
• Check belts for proper tension; adjust as
necessary and replace any frayed or badly
worn belts.
• Check radiator cores for leaks and make
sure the cores are not clogged with dirt or
insects. To avoid damaging the fins, clean
cores with a low-pressure air hose. Steam
clean if required.
• Inspect the water pump operation. A leaky
pump sucks in air, increasing corrosion.
• Repair all leaks promptly. Unrepaired leaks
can lead to trouble. Inspect and tighten
radiator mounts periodically. Test and
replace thermostats regularly.
NOTE
In order to ensure the integrity of the system, it
is recommended that a periodic cooling system
pressure check be made. Pressurize the
cooling system to 103-138 kPa (15-20 psi)
using Radiator and Cooling System Tester,
J24460-1. Do not exceed 138 kPa (20 psi).
Any measurable drop in pressure may indicate
a leak. Whenever the oil pan is removed, the
cooling system should be pressure checked as
a means of identifying any incipient coolant
leaks. Make sure the cause of the internal leak
has been corrected before flushing the
contaminated system.
Leaks at the thermostat housing hose
connections may be caused by deformation of
connections or by rough surfaces on the castings
of the hose mounting surfaces. It is
recommended that "Dow Corning RTV-102
Compound" or any equivalent product be applied
on cast surfaces prior to hose installation.
CAUTION
Castings should be clean and free of oil and
grease before applying compound. No other
sealer should be used with RTV-102
compound.
2.2 VEHICLES EQUIPPED WITH DDC
SERIES 60 ENGINE
MAINTENANCE
Maintain the prescribed inhibitor strength levels
as required. Coolant and inhibitor
concentration must be checked at each engine
oil change, every 12,500 miles (20 000 km) or
once a year, whichever comes first to ensure
inhibitor strength. For vehicles equipped with
coolant filters replace precharge element filter
with a maintenance element filter as per
″
SPIN-
ON COOLANT FILTER
″
in this section. If the
vehicle is not equipped with a filter, add the
recommended inhibitor concentration to the
antifreeze/water solution.
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