ISM, ISMe, and QSM11 – 012-007   Air Compressor Cylinder Head, Single Cylinder

Remove the air inlet and outlet lines from the air compressor.

• For Signature™, ISX, and QSX15 engines, use this procedure. Refer to Procedure 012-014 in Section 12.
• For ISM, ISMe and QSM!1 engines, use this procedure. Refer to Procedure 012-014 in Section 12.

Inspect the lines for signs of a coolant leak.

If signs of a leak are found, the cylinder head must be replaced.

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.

• Drain the cooling system. For Signature™, ISX, and QSX15 engines, use this procedure. Refer to Procedure 008-018 in Section 8. For ISM, ISMe and QSM!1 engines, use this procedure. Refer to Procedure 008-018 in Section 8.

Remove the air governor or air governor signal line (if equipped).

Remove the air inlet and outlet connections from the air compressor.

Remove the four 8-mm capscrews.

Remove the air compressor head and gasket.

Assemble the air compressor using a new gasket.

Install the head and gasket.

Install the four 8-mm capscrews.

Tighten the capscrews in the sequence shown. Use the torque plus angle method.

If a new head assembly is being installed, tighten the five small head cover bolts in the sequence shown.

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

• Fill the cooling system. For Signature™, ISX, and QSX15 engines, use this procedure. Refer to Procedure 008-018 in Section 8. For ISM, ISMe and QSM!1 engines, use this procedure. Refer to Procedure 008-018 in Section 8.
• Operate the engine and check for leaks and proper operation.