Service Manual

ISB, ISBe and QSB (Common Rail [...] Coolant Thermostat
Section 8 - Cooling System - Group 08 Page 8-11
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WARNING
Coolant is toxic. Keep away from children and pets. If
not reused, dispose of in accordance with local
environmental regulations.
WARNING
Do not remove the pressure cap from a hot engine.
Wait until the coolant temperature is below 50°C
[120°F] before removing the pressure cap. Heated
coolant spray or steam can cause personal injury.
CAUTION
Use caution when draining coolant so that it is not
spilled or drained into the bilge area. Do not pump the
coolant overboard. If the coolant is not reused, it
must be discarded in accordance with local
environmental regulations.
Drain the coolant below the level of the thermostat.Refer
to Procedure 008-018.
On QSB5.9 engines with keel cooling, remove the coolant
hose from the inlet side of the keel cooler thermostat
housing.
WARNING
Complete this test with the engine coolant
temperature below 50°C [122°F]. Hot steam can cause
serious personal injury.
Loosen radiator hose clamp.
Remove the radiator hose from the water outlet
connection.Refer to Procedure 008-045.
Marine applications, remove the heat exchanger hose
from the water outlet connection and plug the heat
exchanger engine coolant inlet connection.Refer to
Procedure 008-053.
Use an electronic service tool to monitor the coolant
temperature; or install a thermocouple or temperature
gauge, which is known to be accurate, in the water header
plate on the engine side of the water outlet connection.
Marine applications, use the service tool to monitor engine
temperature.