Service Manual

ISB, ISBe and QSB (Common Rail [...] Marine Gear Oil Cooler
Section 8 - Cooling System - Group 08 Page 8-69
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WARNING
Troubleshooting with high pressure air presents the
risk of equipment damage, personal injury, or death.
Troubleshooting must be performed by trained,
experienced technicians.
WARNING
Wear appropriate eye and face protection when using
compressed air. Flying debris and dirt can cause
personal injury.
Attach a high-pressure air supply source (air cylinder or
other suitable source) with an air pressure regulator and
an inline shutoff valve to the quick disconnect fitting.
Set the regulator test pressure to 1724 kPa [250 psi].
Submerge the gear oil cooler into a tank of water. Rotate
the cooler to allow any trapped air to escape. Allow the
cooler to remain submerged for one minute.
Inspect for air bubbles at the fitting braze joints.
Inspect for air bubbles at the opening at each end of the
cooler.
If leaks are detected, replace the gear oil cooler.
Remove the cooler from the tank. Shut off the air supply
and disconnect the air supply.
Remove the plug and test fitting.
Fabricate a test fixture to seal the sea water connections,
or use connector hoses with a quick disconnect air
connection to supply a regulated test pressure of 276 kPa
[40 psi] to the sea water side of the gear oil cooler.