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

SECTION 05a: H3 SERIES COOLING SYSTEM
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
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.
PA1615 Maintenance Manual All Series | Section 05a revised September 2016
10
housing hose
CAUTION
Castings should be clean and free of oil and
grease before applying compound. No other
sealer should be
compound.
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.
3

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.
When installing a new hose, clean pipe
connections and apply a thin layer of a
non-hardening sealing compound. Replace worn
out clamps or clamps that pinch hoses.
3.1

HOSE CLAMPS ON COOLANT LINES

All hose clamps used on the heating and cooling
systems have a spring function (spring in the
housing) to compensate
expansion/contraction of/*a hose and metal
connection that occurs during vehicle operation
and shutdown. These clamps are worm-driven,
made of stainless steel.
FIGURE 2: CLAMP TYPE USED ON HEATING &
COOLING SYSTEMS
used with RTV-102
for the normal