Maintenance; General Recommendations; Hoses; Hose Clamps On Coolant Lines - PREVOST H3-41 Maintenance Manual

3.

MAINTENANCE

3.1

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 water pump belt and replace if frayed
or badly worn.

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 thermostat 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
contaminated system.
CAUTION
Hoses and hose connections should be clean
and free of oil and grease before hose clamp
installation. Do not use soap, lubricant or
sealing compound on hose connections.
before flushing the
SECTION 05B: X3 SERIES COOLING SYSTEM
NOTE
For additional information concerning Volvo
D13 engine components or engine-related
components, consult Volvo Trucks Canada or
Volvo Trucks North America Web Site under:
Parts & Service. On Volvo web site, you will
find detailed service procedures for parts
replacement, repair and maintenance.
4.

HOSES

Rotten, swollen, and worn out hoses or loose
connections are frequent causes of cooling
system problems.
Serious overheating is often caused by an old
hose collapsing or from rotten rubber shedding
from hoses and clogging the coolant passages.
Connections should be inspected periodically
and hose clamps tightened. Replace any hose
found to be cracked or swollen.
4.1

HOSE CLAMPS ON COOLANT LINES

All hose clamps used for the heating and cooling
systems have a spring function (spring in the
housing) to compensate
expansion/contraction
connection that occurs during vehicle operation
and shutdown. These clamps are worm-driven
and made of stainless steel.
All connections equal or greater than 2 inches
OD have doubled clamps (two clamps, side by
side) with screw housing separated from at least
90°. A torque wrench should be used for proper
installation.
TORQUE: 30 lb-in (3.39 Nm)
PA1621 Maintenance Manual All Series
for the normal
of hose and metal
| 9
January 2017