Service Manual

Expansion Tank ISB, ISBe and QSB (Common Rail [...]
Page 8-74 Section 8 - Cooling System - Group 08
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Pressure-test the radiator cap. Refer to the OEM service
manual for radiator cap test procedures.
The pressure cap must seal within 14 kPa [2 psi] of the
value stated on the cap, or it must be replaced.
An incorrect or malfunctioning cap can result in the loss of
coolant and the engine running hot.
Radiator Shutter Assembly (008-049)
General Information
Shutters are designed to control airflow across the
radiator. If the shutters fail to open when needed, the
engine can run hot. Failure of the shutters to close can
result in too much airflow and the engine running cold.
NOTE: Make sure the air temperature sensor is
functioning correctly. Check the air-operated shutter
controls. Check for air leaks. Refer to the equipment
manufacturer's service manual.
Winterfronts can be used on a charge air cooled engine
but must be designed to cover part of the frontal area of
the cooling system. A minimum of charge air cooled
frontal area must be left open to airflow.
Winterfronts: 387 cm
2
[60 in
2
].
Expansion Tank (008-052)
General Information
This procedure applies to QSB5.9 marine engines only