ISC, ISCe, QSC8.3, ISL, ISLe3, ISLe4 and QSL9 Engines – 001-005   Bearings, Connecting Rod

WARNING  Batteries can emit explosive gases. To reduce the possibility of personal injury, always ventilate the compartment before servicing the batteries. To reduce the possibility of arcing, remove the negative (-) battery cable first and attach the negative (-) battery cable last.

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 can 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.

• Disconnect the batteries. Refer to Procedure 013-009 in Section 13.
• Drain the lubricating oil.Refer to Procedure 007-037 in Section 7.
• Remove the lubricating oil pan and gasket.Refer to Procedure 007-025 in Section 7.
• Remove the lubricating oil suction tube.Refer to Procedure 007-035 in Section 7.

NOTE: The cylinder head does not need to be removed if the connecting rod bearings are being inspected or replaced.

Remove the connecting rod caps.Refer to Procedure 001-054 in Section 1.

Remove the upper bearing shell and mark it with the letter “U” (upper) and the cylinder number from where it was removed.

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

Wash the bearing and connecting rod caps.

Dry with compressed air.

Inspect the connecting rod caps, connecting rod bearing saddles and capscrews for nicks, cracks, burrs, scratches, or fretting.

Inspect the bearings for damage.

Replace any bearings with the following damage:

• Pitting
• Flaking
• Corrosion
• Lock tang damage
• Scratches.

Inspect the bearing shell seating surface for nicks or burrs.

If nicks or burrs can not be removed with abrasive pad, Part Number 3823258 or equivalent, the bearings must be replaced.

NOTE: If bearings are damaged they must be replaced as a set.

NOTE: For more detailed information of bearing damage, see to “Analysis and Prevention of Bearing Failures” Bulletin 3810387.

Measure the rod bearing shell thickness with an outside micrometer that has a ball tip.

Connecting Rod Bearing Dimensions

Discard a bearing shell if its thickness is below the minimum specification.

NOTE: Connecting rod bearings are identified with a part number and size stamped on the back side.

Determine the size of the removed rod bearing and obtain a set of the same size.

Oversize service rod bearings are available for use with crankshafts that have been machined undersized. See the appropriate parts catalog.

For connecting rod bearing installation instructions use the following. Refer to Procedure 001-054 in Section 1.

WARNING  Batteries can emit explosive gases. To reduce the possibility of personal injury, always ventilate the compartment before servicing the batteries. To reduce the possibility of arcing, remove the negative (-) battery cable first and attach the negative (-) battery cable last.

• Install the lubricating oil suction tube. Refer to Procedure 007-035 in Section 7.
• Install the lubricating oil pan and gasket. Refer to Procedure 007-025 in Section 7.
• Fill the lubricating oil pan. Refer to Procedure 007-037 in Section 7.
• Connect the batteries. Refer to Procedure 013-009 in Section 13.
• Operate the engine and check for leaks.