Service Manual

ISB, ISBe and QSB (Common Rail [...] Cooling Fan Belt Tensioner
Section 8 - Cooling System - Group 08 Page 8-111
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Run the engine under rated rpm and load until the engine
temperature reaches its maximum. Record the inlet and
outlet coolant pressures. If the pressure difference is less
than 34 kPa [5 psi], remove and test the keel cooler
thermostat. Refer to Procedure 008-014
If the pressure difference is greater than 34 kPa [5 psi],
inspect the vessel's keel coolers. Some problems that can
cause high differential pressure are:
1 blockage in the keel cooling system
2 internal damage to the keel cooler.
Refer to the keel cooler OEM troubleshooting and repair
manual.
Cooling Fan Belt Tensioner (008-087)
Preparatory Steps
•
Remove cooling fan drive belt. Refer to Procedure
008-002.
Remove
Remove the belt tensioner mounting capscrew and belt
tensioner.
Inspect for Reuse
Inspect the tensioner bushing between the arm and the
spring case.