SECTION 05A: H3 SERIES COOLING SYSTEM
PA1621 Maintenance Manual All Series | January 2017
13
FIGURE 12: CHARGE AIR COOLER HOSE CLAMPS
CAUTION
The hose clamps will break if over-tighten. Do
not over-tighten, especially during cold
weather when hose has contracted.
Maintenance
Since the constant-torque clamp automatically
adjusts to keep a consistent sealing pressure,
there is no need to re-torque hose clamps on a
regular basis. During vehicle operation and
shutdown, the screw tip will adjust according to
the temperature and pressure changes.
Checking for proper torque should be done
at room temperature.
5 THERMOSTAT OPERATION
5.1 THERMOSTAT REPLACEMENT
1. Drain the cooling system.
2. Remove the bolts, the thermostat housing
and the thermostat. Carefully clean the
thermostat seat and all cylinder head-to-
thermostat housing mating surfaces.
FIGURE 13: VOLVO D13 THERMOSTAT HOUSING
3. Install the new thermostat. Make sure that
the rubber seal remains properly seated.
4. Position the thermostat housing to the
cylinder head, install and tighten the bolts.
TORQUE: 15-21 lb-ft (20-28 Nm)
5. Install the rubber radiator hose to the
thermostat housing. Position the clamp and
tighten to secure.
6. Fill the system with the recommended
coolant.
7. Start the engine, check for leaks and proper
operation. After shutdown, replenish fluids as
necessary.
5.2 CHECKING NEW THERMOSTAT
A function check must be carried out before
installing a new thermostat.
NOTE
Check to be sure if the new thermostat closes
fully. This can be done by holding it up to the
light to check that there is no visible gap at the
opening point. If the thermostat does not close
properly, replace it.
1. Warm up water in a receptacle to 75°C
(167°F) and immerse the thermostat in the
water. Use a piece of wire attached to the
thermostat.
2. After at least 30 seconds, check that the
thermostat is still closed.
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