N14 Base Engine Troubleshooting and Repair Manual – 012-014   Air Compressor

WARNING  When using a steam cleaner, wear protective clothing and safety glasses or a face shield. Hot steam can cause serious personal injury.

WARNING  Wear appropriate eye and face protection when using compressed air. Flying debris and dirt can cause personal injury.

NOTE: The illustrations shown will be of the SS model single cylinder air compressor. Differences in procedures for SS, QE, and ST model Cummins air compressors will be shown where necessary.

Use steam to clean the air compressor. Dry with compressed air.

Remove the fuel pump. Refer to Procedure 005-016.

Drain the engine coolant. Refer to Procedure 008-018.

Remove the coolant lines from the air compressor.

Remove the air connections from the air compressor.

Remove the air compressor support bracket and capscrews.

Remove the four capscrews, the air compressor, and splined coupling.

Inspect the compressor housing for cracks or damage.

Inspect the splined coupling for cracks or damage.

NOTE: It is not necessary to time the air compressor on the NT engine. Although the Big Cam III through 88NT publications have specified air compressor timing, this is not required on any NT engine.

Position the timing mark on the air compressor crankshaft at the 12-o’clock position.

Position the accessory driveshaft dowel pin at the 2-o’clock position as view from the front of the engine.

Install the splined coupling onto the accessory drive shaft.

Make sure the gasket surfaces of the accessory drive and the air compressor are clean and not damaged.

Use a new gasket and install the air compressor and four capscrews to the accessory drive.

Install the air compressor support bracket.

Tighten the capscrews.

NOTE: If rubber grommets are used on the coolant lines, make sure they are installed carefully to prevent cuts or tears to the grommets which will cause coolant leaks. When flexible tubing is used, make sure that it does not rub any other surfaces.

Install the coolant and air lines to the air compressor and tighten.

Install the fuel pump drive coupling onto the air compressor.

Install the fuel pump. Refer to Procedure 005-016.

Fill the engine cooling system. Refer to Procedure 008-018.

Operate the engine and check for leaks.