Service Manual

Charge-Air Cooler (CAC) ISB, ISBe and QSB (Common Rail [...]
Page 10-28 Section 10 - Air Intake System - Group 10
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If the pressure drop is greater than 48 kPa [7 psi] in 15
seconds, the charge air cooler must be replaced.
Refer to the OEM service manual for replacement
instructions.
NOTE: Charge air coolers are not designed to be 100-
percent leak free. If the pressure drop is less than 48 kPa
[7 psi] in 15 seconds, then the charge air cooler does not
need to be replaced.
Install
Install the charge air cooler.
Refer to the OEM service manual for instructions.
Finishing Steps
Install the charge air cooler piping. Refer to Procedure
Procedure 010-019 (Air Crossover)
Operate the engine and check for leaks.