ISC, ISCe, QSC8.3, ISL, ISLe3, ISLe4 and QSL9 Engines – 001-016   Crankshaft

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.

• Disconnect the battery. Refer to Procedure 013-009 in Section 13.
• Remove the engine and place it on an engine stand. Refer to Procedure 000-001 in Section 0.
• Remove the drive belt. Refer to Procedure 008-002 in Section 8.
• Remove the rubber vibration damper, if installed. Refer to Procedure 001-051 in Section 1.
• Remove the viscous vibration damper, if installed. Refer to Procedure 001-052 in Section 1.
• Remove the front cover. Refer to Procedure 001-031 in Section 1.
• Remove the starter. Refer to Procedure 013-020 in Section 13.
• Remove the flexplate, if installed. Refer to Procedure 016-004 in Section 16.
• Remove the flywheel, if installed. Refer to Procedure 016-005 in Section 16.
• Remove the flywheel housing. Refer to Procedure 016-006 in Section 16.
• Remove the rear crankshaft seal carrier. Refer to Procedure 001-067 in Section 1.
• 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 fuel pump. Refer to Procedure 005-016 in Section 5.
• Remove the air compressor, if required. Refer to Procedure 012-014 in Section 12.
• Remove the installed camshaft gear. Refer to Procedure 001-012 in Section 1.
• Remove the removed camshaft gear. Refer to Procedure 001-013 in Section 1.
• Remove the front gear housing. Refer to Procedure 001-033 in Section 1.
• Remove the connecting rod caps. Refer to Procedure 001-005 in Section 1.
• Remove the main bearing caps. Refer to Procedure 001-006 in Section 1.

NOTE: Lift the crankshaft straight up to avoid damage to the crankshaft and cylinder block.

Install nylon lift sling, Part Number 3375957, around the number 3 and number 4 rod bearing journals.

Attach the sling to a hoist and remove the crankshaft.

Remove the upper main bearings.

Use an awl to mark the bearing position in the tang area.

NOTE: Mark the bearing position for future identification or possible failure analysis.

Use fine crocus cloth to polish the machined surfaces.

Use a bristle brush to clean the oil drillings.

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

Steam clean the crankshaft and dry with compressed air.

Make sure to blow out the threaded holes on each end of the crankshaft and oil drillings.

Inspect the threaded capscrew holes for damage.

Use one of the following methods to repair any damaged threaded holes:

• Chase the threads.
• Use the threaded insert kit, Part Number 3822709.

NOTE: A maximum of one front crankshaft threaded hole and three rear crankshaft holes can be repaired. If more than one threaded hole in the front of the crankshaft or three threaded holes in the rear of the crankshaft requires repair, the crankshaft can not be salvaged.

Measure the front and rear oil seal contact areas for a wear groove.

Crankshaft Front and Rear Oil Seal Wear Groove

Inspect the crankshaft connecting rod and main journals for deep scoring, overheating, etc. Minor scratches are acceptable.

Use a micrometer to measure the connecting rod journals.

Crankshaft Connecting Rod Journal Diameter

Crankshaft Connecting Rod Out of Roundness

Crankshaft Connecting Rod Journal Taper

NOTE: If the crankshaft connecting rod journals are not within the given specifications, the crankshaft must be reground. Always grind all of the journals when one is not within specifications. Oversize connecting rod bearings are available; see the appropriate parts catalog.

Use a micrometer to measure the crankshaft main bearing journals.

Crankshaft Main Bearing Journal Diameter

Crankshaft Main Bearing Journal Out of Roundness

Crankshaft Main Bearing Journal Taper

NOTE: If the crankshaft main bearing journals are not within the given specifications, the crankshaft must be reground. Always grind all of the journals when one is not within specifications. Oversize connecting rod bearings are available; see the appropriate parts catalog.

Measure the thrust face width. Minor scratches are acceptable. Use a fine crocus cloth to polish the machined surfaces.

Crankshaft Thrust Face Width (Standard)

NOTE: Oversize thrust bearings are available if the thrust distance is not within specifications. See the appropriate parts catalog.

Measure the rear oil seal flange outside diameter.

Crankshaft Rear Oil Seal Flange Outside Diameter

Measure the damper pilot outside diameter.

Crankshaft Damper Pilot Outside Diameter

Measure the crankshaft gear journal outside diameter.

Crankshaft Gear Journal Outside Diameter

Use a light preservative oil to lubricate the crankshaft to prevent rust.

NOTE: If the crankshaft is not going to be used immediately, protect the part with a plastic cover to prevent dirt from sticking to the oil.

CAUTION  The tang (1) on the bearing shell must be in the slot (2) of the bearing saddle to correctly position the bearing and prevent engine damage.

Upper Main Bearings

Do not lubricate the side of the main bearing that is against the cylinder block.

Apply a coat of assembly lubricant, Part Number 3163087 or equivalent, to the crankshaft side of the upper main bearings.

NOTE: Make sure the main bearing being installed is the same size as the main bearing that was removed. The size is engraved on the back of the main bearing.

NOTE: The crankshaft thrust bearing must be installed in the number four position.

NOTE: The upper and lower main bearing shells of some engines are not interchangeable. The backs of the main bearings are marked with the proper orientation, if required.

NOTE: If used bearing shells are to be installed, they must be installed in their original locations, as marked during disassembly.

Use a hoist and nylon list sling, Part Number 3375957.

Install the sling around the number 3 and number 4 connecting rod bearing journals.

Install the crankshaft.

• Install the main bearing caps. Refer to Procedure 001-006 in Section 1.
• Install the connecting rod caps. Refer to Procedure 001-005 in Section 1.
• Install the rear crankshaft seal carrier. Refer to Procedure 001-067 in Section 1.
• Install the front gear housing. Refer to Procedure 001-033 in Section 1.
• Install the camshaft gear. Refer to Procedure 001-012 in Section 1.
• Install the fuel pump. Refer to Procedure 005-016 in Section 5.
• Install the air compressor, if required. Refer to Procedure 012-014 in Section 12.
• 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.
• Install the flywheel housing. Refer to Procedure 016-006 in Section 16.
• Install the flexplate, if removed. Refer to Procedure 016-004 in Section 16.
• Install the flywheel, if removed. Refer to Procedure 016-005 in Section 16.
• Install the front cover. Refer to Procedure 001-031 in Section 1.
• Install the vibration damper, if removed. Refer to Procedure 001-051 in Section 1.
• Install the vibration damper, if removed. Refer to Procedure 001-052 in Section 1.
• Install the drive belt. Refer to Procedure 008-002 in Section 8.
• Check the engine rotation. See the Rotation Check section of this procedure.
• Connect the batteries. Refer to Procedure 013-009 in Section 13.
• Operate the engine and check for leaks.

With the engine fully assembled, check to be sure the engine rotates freely. Use barring tool, Part Number 3824591.

Insert the barring tool into the flywheel housing and engage the flywheel/flexplate ring gear. The crankshaft can then be rotated by hand, using a 1/2-inch ratchet or breaker bar.

If the engine does not rotate freely, check for any external obstructions (flywheel/flexplate, engine-driven accessories, etc.). If no obstructions are found, remove the oil pan and look for internal damage.