Cummins ISX11.9 CM2250 – Service Manual 001-027   Cylinder Block and Liner Seats

WARNING  To reduce the possibility of personal injury, avoid direct contact of hot oil with your skin.

WARNING  Some state and federal agencies have determined that used engine oil can be carcinogenic and cause reproductive toxicity. Avoid inhalation of vapors, ingestion, and prolonged contact with used engine oil. If not reused, dispose of in accordance with local environmental regulations.

• Drain the engine lubricating oil. Refer to Procedure 007-037 in Section 7.
• Remove the lubricating oil pan. Refer to Procedure 007-025 in Section 7.
• Remove the lubricating oil suction tube. Refer to Procedure 007-035 in Section 7.
• Remove the block stiffener plate. Refer to Procedure 001-089 in Section 1.

Pressurize the engine cooling system. Refer to Procedure 008-020 in Section 8.

Apply air pressure 15 minutes before inspecting the cylinder liner seats. Be sure the system is holding air pressure before beginning the inspection.

Inspect the outside circumference of the cylinder liners and the area below the cylinder liner seats in the cylinder block for coolant leaks.

Liner ledge pitting has an appearance very similar to liner pitting. Contributing factors to its formation are combustion gases in the cooling system, poorly maintained coolant chemistry, and excessive load reversal at the liner to cylinder block contact area. Liner ledge pitting starts at the radius and progresses towards the center of the bore. In most circumstances this would not be a block malfunction.

To determine cylinder block reusability, the following conditions must be met. First, the correct liner protrusion must be obtainable. Refer to Procedure 001-028 in Section 1. Next, there can be no coolant leaks past the liner seat and the lower o-ring.

If a leak is found:

• Remove and inspect the cylinder liners. Refer to Procedure 001-028 in Section 1.
• Inspect the cylinder block liner bore area. If fretting or wear is found, the cylinder block must be replaced.

• Install the block stiffener plate. Refer to Procedure 001-089 in Section 1.
• Install the lubricating oil suction tube. Refer to Procedure 007-035 in Section 7.
• Install the lubricating oil pan. Refer to Procedure 007-025 in Section 7.
• Fill the engine with lubricating oil. Refer to Procedure 007-037 in Section 7.
• Prime the lubricating oil system. Refer to Procedure 007-037 in Section 7.
• Operate engine to normal operating temperature and check for leaks.

NOTE: If failure resulted in coolant, oil, excessive fuel or excessive black smoke entering the exhaust system, the aftertreatment system must be inspected. Refer to Procedure 014-013 in Section 14.