Air Leaks, Air Intake and Exhaust Systems (010-024)
B3.9 and B5.9 Series Engines
Section 10 - Air Intake System - Group 10
Operate the engine at full throttle and rated rpm with maxi-
Listen for a high-pitched whistling noise from the turbo-
charger, nearby piping, and connections.
The noise can be caused by an air leak from the:
1. Turbocharger-to-discharge elbow connection.
Inspect for damage. Tighten loose clamps.
2. Any charge air cooler tubing or connecting hoses.
Inspect the hose and tubing for damage.
Tighten the hose clamps.
Refer to the manufacturer's specifications for the
3. Turbocharger-to-exhaust-manifold mounting gasket.
Replace the gasket. Refer to Procedure 010-033.