Cummins ISX11.9 CM2250 – Service Manual 008-062   Water Pump

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.

NOTE: This procedure covers the removal and installation of the entire water pump assembly.  If only the water pump cartridge needs removed, use the following procedure. Refer to Procedure 008-102 in Section 8.

• Remove the pressure cap when the engine is cool.
• Drain the cooling system. Refer to Procedure 008-018 in Section 8.
• Remove the cooling fan drive belt. Refer to Procedure 008-002 in Section 8.
• Remove the coolant filter. Refer to Procedure 008-006 in Section 8.
• Remove the coolant filter head. Refer to Procedure 008-007 in Section 8.
• Remove the water inlet connection. Refer to Procedure 008-082 in Section 8.

Remove the four water pump mounting capscrews.

Discard the o-ring.

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.

CAUTION  Do not use solvents to clean the water pump as they can cause damage to the water pump cartridge bearing.

Use steam to clean the water pump housing.

Dry with compressed air.

Inspect the water pump housing for cracks and other damage.

Inspect the water pump inlet tube for out-of-roundness, damage, or leaks.

Continuous pitting deeper than 0.635 mm [0.025 in], or individual pits deeper than 2.54 mm [0.100 inch] are not acceptable.

Replace the water pump housing if not within specifications.

Inspect the pulley for wear, cracks, and other damage.

If the pulley is damaged, the water pump cartridge must be replaced.

CAUTION  Do not use petroleum based lubricants. Petroleum based lubricants cause the o-ring to crack or swell, leading to a coolant leak.

Install a new water pump inlet o-ring and a new EGR tube outlet o-ring seal.

Lubricate the o-ring seals with vegetable oil prior to installation.

Install the four water pump housing capscrews.

Tighten the capscrews.

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

• Install the water inlet connection. Refer to Procedure 008-082 in Section 8.
• Install the coolant filter head. Refer to Procedure 008-007 in Section 8.
• Install the coolant filter. Refer to Procedure 008-006 in Section 8.
• Install the cooling fan drive belt. Refer to Procedure 008-002 in Section 8.
• Fill the cooling system. Refer to Procedure 008-018 in Section 8.
• Install the pressure cap.
• Operate the engine to normal operating temperature and check for leaks.