Cummins ISX11.9 CM2250 – Service Manual 012-014   Air Compressor

WARNING  When using a steam cleaner, wear safety glasses or a face shield, as well as protective clothing. 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.

WARNING  Do not remove the pressure cap from a hot engine. Wait until the coolant temperature is below 50°C [120°f] before removing the pressure cap. Heated coolant spray or steam can cause personal injury.

WARNING  Coolant is toxic. Keep away from children and pets. If not reused, dispose of in accordance with local environmental regulations.

• Use steam to clean the air compressor. Dry with compressed air.
• Drain the engine coolant. Refer to Procedure 008-018 in Section 8.
• Remove the air compressor coolant lines. Refer to Procedure 012-004 in Section 12.
• Disconnect the air governor pressure signal line. Remove the air governor, if equipped.
• Remove the air discharge line. Refer to Procedure 012-015 in Section 12.

Remove the air compressor support bracket and capscrews.

Remove the two mounting nuts and the air compressor.

Discard the gasket.

Inspect the compressor housing for cracks or other damage.

If cracks or other damage is found, replace the compressor housing.

Inspect the compressor drive gear for cracks or other damage.

If cracks or other damage is found, replace the drive gear.

Make sure the gasket surfaces of the front gear housing and the air compressor are clean and not damaged.

If damage is found on the gasket surface that will result in a leak path, the damaged component must be replaced.

Install the air compressor and the two nuts onto the front gear housing.

Tighten the mounting nuts.

Tighten the mounting nuts again.

Install the air compressor mounting brace and four capscrews on the cylinder block beneath the air compressor.

Start installing all four capscrews.

Loosely assemble the brace capscrws to the air compressor rear flange.

Align the brace thru holes with the holes in the cylinder block. Make sure the mating face of the brace is as close as allowed by stack-up to the rear flange of the air compressor.

Insert and hand-tighten the capscrews into the cylinder block.

Tighten the capscrews into the air compressor rear flange.

Tighten the capscrews on the cylinder block and air compressor.

WARNING  Coolant is toxic. Keep away from children and pets. If not reused, dispose of in accordance with local environmental regulations.

• Remove the front gear cover. Refer to Procedure 001-031 in Section 1.
• Reset the idler gear backlash. Refer to Procedure 001-055 in Section 1.
• Install the coolant lines and fittings. Refer to Procedure 012-004 in Section 12.
• Install the air governor, if removed. Connect the air governor pressure signal line.
• Install the air discharge line. Refer to Procedure 012-015 in Section 5.
• Fill the engine cooling system. Refer to Procedure 008-018 in Section 8.
• Operate the engine to normal operating temperature and check for leaks.