Service Manual

ISB, ISBe and QSB (Common Rail [...] Sea Water System Diagnostics
Section 8 - Cooling System - Group 08 Page 8-117
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If the pressure drop between the inlet side of the
aftercooler and the outlet side of the aftercooler is within
specification, attach the pressure gauge to the gear oil
cooler drain plug located on the outlet and check for
pressure drop across the gear oil cooler.
If the pressure drop between the inlet side (1) and the
outlet side (2) of the gear cooler is greater than the
maximum specification, check for blockage in the gear
cooler. Clean or replace if necessary. Refer to Procedure
008-041
Refer to Procedure 018-018 for Marine engine
specifications.
If the pressure drop in the gear oil cooler is within
specification, test the pressure drop across the engine
heat exchanger.
Fabricate a sea water test tool by using a 38 mm [1-1/2 in]
pipe with a fitting in the center to connect a pressure
gauge.
Install the fabricated test tool between the outlet side of
the heat exchanger and the exhaust elbow. Check the
pressure drop across the heat exchanger.
If the pressure drop is greater than the maximum
specification, check for blockage in the heat exchanger.
Clean or replace if necessary.
Refer to Procedure 018-018 for Marine engine
specifications.