Cummins N14 STC, Celect, Celect Plus – Service Manual 010-024   Air Leaks, Air Intake and Exhaust Systems

CAUTION  Engine intake air must be filtered to prevent dirt and debris from entering the engine. If intake air piping is damaged or loose, unfiltered air will enter the engine and cause premature wear.

Inspect for loose clamps or damage between the intake air piping, air cleaner, turbocharger, CAC, and intake manifold.

Replace damaged pipes and tighten loose clamps.

Operate the engine at full throttle and maximum load and check for air leaks. Listen for whistling noises caused by high pressure air leaks.

The noise can be caused by an air leak from the turbocharger to CAC elbow connection.

Inspect the connection and o-ring seal for damage.

Tighten the V-band clamps.

Inspect any CAC piping or connecting hose for damage.

Tighten the hose clamps.

Replace the turbocharger to exhaust manifold mounting gasket. Refer to Procedure 010-033 in Section 10.

Check the turbine housing sealing surface for an air leak.

Tighten the V-band clamp.

Check for an air leak. If an air leak is still present, remove and replace the turbocharger. Refer to Procedure 010-033 in Section 10.

Check the compressor housing sealing surface for an air leak.

Tighten the V-band.

Check for an air leak.

If an air leak is still present, remove and replace the turbocharger. Refer to Procedure 010-033 in Section 10.