ISC, ISCe, QSC8.3, ISL, ISLe3, ISLe4 and QSL9 Engines – 001-006   Bearings, Main

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

WARNING  Some state and local 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.

• 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.

Before removing the main bearing caps, make certain that the caps are clearly marked for their location on the lubricating oil cooler side of the main bearing cap.

When replacing bearings in chassis, replace number 2 through number 6 while the number 1 and number 7 caps support the crankshaft. After replacing number 2 through number 6, replace number 1 and number 7.

Remove all main bearing caps except the number 1 and number 7 main bearing caps.

To remove the upper main bearings, install the main bearing replacer, Part Number 3823818, in the oil hole of the crankshaft main bearing journal.

Rotate the crankshaft so that the replacer contacts the upper main bearing on the side opposite the tang.

Continue to rotate the crankshaft in the direction that will remove the tang side (1) of the upper main bearing first.

Remove the bearing.

Follow this procedure to remove the other main bearings except for number 1 front main bearing.

CAUTION  Use care so the screwdriver does not damage the crankshaft or cylinder block.

NOTE: The front main bearing, number 1, does not have a hole in the journal, so the tool can not be used to replace the bearing.

Use a flat blade screwdriver to gently bump the end of the bearing to loosen it from the cylinder block. Then, use finger pressure against the main bearing shell and rotate the crankshaft to roll the main bearing out.

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.

Steam clean the main bearing caps.

Dry with compressed air.

Inspect all main bearing caps and main bearing crankshaft journals for deep scoring, overheating, etc.

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

Main Bearing Dimensions

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

Do not lubricate the side that is against the cylinder block.

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

Apply a coat of assembly lubricant, Part Number 3163086 or equivalent, to the crankshaft side of the main bearings.

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.

Insert the side of the main bearing opposite the tang first. Install as far as possible by hand.

When installing the thrust bearing in the number four journal, it could be necessary to push the crankshaft to the front or rear of the cylinder block.

Make sure the pin does not slide under the bearing.

Using the main bearing replacer, Part Number 3823818, finish installing the main bearing by rotating the crankshaft. Rotate the crankshaft using the barring tool, Part Number 3824591.

Make sure the tang (1) on the main bearing is located in the notch (2) of the cylinder block.

Finish pushing the main bearing into position.

Install the lower main bearings into the main bearing caps.

Apply a coat of Lubriplate™ 105 multi-purpose lubricant, Part Number 3163086 or equivalent, to the crankshaft side of the main bearings.

Make sure the caps are correctly installed with the number towards the oil cooler side of the engine.

Install a main bearing cap after each upper main bearing is installed to keep the main bearing in place while the other uppers are installed.

Lubricate the main bearing capscrew under the cap and lubricate the main bearing capscrew threads using clean 15W-40 engine oil.

Tighten capscrews.

Do not tighten to the final torque value at this time.

Repeat this procedure to install the remaining bearing and caps with the exception of main bearing number 1.

The thrust bearing must be installed in the number 4 journal.

NOTE: The front main, number 1, does not have a hole in the journal so the pin can not be used to replace the bearing.

Lubricate and install the number 1 main bearing.

Insert the side of the main bearing opposite the tang first. Install as far as possible by hand.

Use the screwdriver to push the main bearing into position as you rotate the crankshaft.

The crankshaft must rotate freely.

Tighten the main bearing capscrews evenly and in sequence.

Check the main bearing installation and the size of the main bearings if the crankshaft does not rotate freely.

The dimensions of the thrust bearing and crankshaft journal determine end play.

Measure the crankshaft end play using dial indicator, Part Number 3824564 and magnetic base, Part Number 3377399.

Crankshaft End Play Limits

• 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.
• Operate the engine and check for leaks.