Home » ISX11.9 CM2250 - Service Manual » Cummins ISX11.9 CM2250 – Service Manual 001-006   Bearings, Main

Cummins ISX11.9 CM2250 – Service Manual 001-006   Bearings, Main

Preparatory Steps

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 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.

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Remove

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NOTE: Cummins Inc. recommends replacing the thrust bearings when the main bearings are replaced. Refer to Procedure 001-007 in Section 1.

If the crankshaft is not going to be removed, replace the main bearings one at a time.

Loosen the main bearing cap capscrews..

Use the main bearing cap puller, Part Number ST-1178, to remove the cap.

The tool must be centered on the cap. Pull straight down to remove the cap.

Remove the main bearing capscrews and cap.

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Remove the lower main bearing shell from the cap.

Mark the bearing shell with the letter “L” and the journal number from which it was removed.

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To remove the upper main bearing shell, install the bearing rollout tool, Part Number 3823818, into the oil drilling in the main bearing journal.

Remove the tang side (1) of the main bearing shell first.

To remove the upper main bearing shell, rotate the crankshaft. Refer to Procedure 009-035 in Section 9.

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Clean and Inspect for Reuse

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 WARNING 

When using solvents, acids, or alkaline materials for cleaning, follow the manufacturer’s recommendations for use. Wear goggles and protective clothing to reduce the possibility of personal injury.
 WARNING 

Some solvents are flammable and toxic. Read the manufacturer’s instructions before using.
 WARNING 

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

Prevent oil seepage down onto the mating faces of the block mains, cleaning of the block main capscrew threaded holes is critical. (Use cotton swabs, or equivalent, to absorb as much oil as possible prior to installing main caps.) Loctite™ 518 anaerobic sealant, Part Number 4918675, will not seal to an oily surface.

Use solvent and a soft bristle brush to clean the bearing cap, capscrews, washers, and bearings.

Dry the parts with compressed air.

The mounting surfaces of the main bearing caps must be free of grease and oily residue.

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Clean all main bearing cap mounting surfaces on the cylinder block with a solvent.

Dry the main bearing cap mounting surfaces on the cylinder block with a clean, lint-free cloth.

The main bearing cap surfaces must be free of grease and oily residue.

Use solvent and a soft bristle brush to clean the bearing cap, capscrews, washers, and bearings.

Dry the parts with compressed air.

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Inspect the main bearing cap, capscrews, and washers for damage.

Inspect the bearing shells for nicks, scratches, or other damage.

If the main bearings are damaged, inspect the crankshaft main bearing journals. If the crankshaft is damaged, the engine must be removed for repair. Refer to Procedure 000-001 in Section 0.

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Use an outside diameter ball-tipped micrometer to measure the main bearing shell thickness.

Standard Main Bearing Shell Thickness

mm in
3.199 MIN 0.1259
3.211 MAX 0.1264

If the bearing shell is not within specifications, it must be replaced.

For more detailed information on bearing damage, refer to Analysis and Prevention of Bearing Failures, Bulletin 3810387.

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Crankshafts that are ground undersize in the connecting rod and main bearing journals are marked on the front counterweight. If the crankshaft is marked, check the bearing shell part number to make sure the correct bearing size is used.

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Install

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 CAUTION 

The cylinder block saddle and the cap mating surfaces must be clean and dry when the bearing shells are installed. Used bearings must be installed in their original location or engine damage can occur.
 CAUTION 

The bearing tang must fit into the slot in the bearing saddle or engine damage can occur.
 CAUTION 

Do not use a capscrew or any hard metal object to install bearings, as this can damage the crankshaft and cause severe engine damage.

Use clean Lubriplate™ 105 multi-purpose lubricant or equivalent, to lubricate the upper main bearing shell to crankshaft journal mating surface.

Start the bearing into the upper saddle by hand. Slide the bearing into position. Take care to not damage the crankshaft journal while installing the bearing.

If the upper main bearings are installed without the crankshaft in place, check the oil feed hole in the bearing to be sure that at least 80 percent of the oil feed hole in the main bearing saddle is visible.

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Use clean Lubriplate™ 105 multi-purpose lubricant or equivalent, to lubricate the inside diameter of the bearing shells and the liner side of the upper thrust bearings.

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Align the lower main bearing shell and push it into place.

 
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 CAUTION 

Make sure the bevel side is toward the crankshaft journal. Incorrect thrust bearing installation will result in engine damage.

NOTE: Only Number 4 main bearing cap has a thrust bearing.

Use clean Lubriplate™ 105 multi-purpose lubricant, or equivalent, to lubricate the liner side of the lower thrust bearings.

Install the lower thrust bearings in the Number 4 main bearing cap with the grooved sides of the thrust bearing facing away from the main bearing cap.

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 CAUTION 

Make sure the grooved side of the thrust bearing is toward the crankshaft journal. Incorrect thrust bearing installation will result in engine damage.

Install the upper thrust bearings in the Number 4 main bearing saddle.

Push the crankshaft toward the rear of the engine to install the front thrust bearing and toward the front of the engine to install the rear thrust bearing.

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 CAUTION 

Only use Loctite™ 518 thread sealant, Part Number 4918675, on the main cap joint mating surface. Other sealants can become hard, brittle, and allow oil and debris into the main bearing/block joint, causing engine damage.
 CAUTION 

The bead must be 3 to 5 mm [0.12 to 0.20 in] wide and must not enter the main bearing shell inside the main bearing shell inside diameter. Sealant in the main bearing can cause engine damage.

Apply a bead of Loctite™ 518 thread sealant, Part Number 4918675, to the two main bearing cap joint mating surfaces on each main bearing cap, as illustrated.

 
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Use clean 15W-40 engine oil to lubricate the capscrew threads and the underside of the capscrew heads.

Drain the excess oil from the capscrews before installing them and be sure there is not excessive oil in the threaded hole on the block.

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 CAUTION 

The main bearing caps are marked with a “V” Position the “V” mark so that it points to the front of the engine. Incorrect positioning will result in severe engine damage.

Align the capscrew holes in the cap with the holes in the cylinder block. Make sure the lower bearing shell is in position.

Install the capscrews through the cap and into the cylinder block.

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To reduce the possibility of bore size issues, clearance issues, or both, the main bearing capscrews must be tightened within 15 minutes of the Loctite™ 518 thread sealant, Part Number 4918675, application.

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Make sure the bearing shell does not move.

Seat the main bearing cap evenly by tapping the cap with a non-metallic hammer.

Make sure that the thrust bearings are in place and properly seated when installing the Number 4 main bearing cap.

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It is recommended to use an air impact wrench and socket, Part Numbers 3163059 and 3165161, to rotate the capscrews an additional 90 degrees.

Use the torque plus angle method to tighten the main bearing capscrews in the sequence illustrated.

Torque Value:

  1. 170 n.m   
    [125 ft-lb]
  2. 372 n.m   
    [274 ft-lb]
  3. Rotate 90 degrees.

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Measure

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To measure the end clearance of the crankshaft, install a dial indicator onto the oil pan flange.

Place the tip of the gauge against the crankshaft counterweight.

Push the crankshaft toward the rear of the cylinder block.

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Set the dial indicator at “0” (zero).

Push the crankshaft toward the front of the cylinder block.

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Measure the crankshaft end clearance.

Crankshaft End Clearance – New or Reground

mm in
0.10 MIN 0.004
0.50 MAX 0.020
 
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If the end clearance is less than 0.10 mm [0.004 in], loosen all main bearing capscrews one turn.

Push the crankshaft toward the front and then toward the rear of the cylinder block.

 
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Tighten the main bearing capscrews in sequence.

Torque Value:

  1. 170 n.m   
    [125 ft-lb]
  2. 372 n.m   
    [274 ft-lb]
  3. Rotate 90 degrees.

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Measure the crankshaft end clearance.

Crankshaft End Clearance – New or Reground

mm in
0.10 MIN 0.004
0.50 MAX 0.020

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If the crankshaft end clearance is still not within specification, remove the thrust bearings and inspect the thrust bearings. Worn bearings can cause excess end play. Refer to Procedure 001-007 in Section 1. 

Crankshafts that have been reground on the thrust bearing surfaces are marked for oversize thrust bearings on the rear crankshaft counterweight. If the crankshaft counterweight is marked or the crankshaft end clearance is not within specifications, check the thrust bearing part number to make sure the correct thrust ring size is used.

Example: F0.010 = front 0.25 mm [0.010 in]

Example: R0.020 = rear 0.51 mm [0.020 in]

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Measure the crankshaft end clearance.

Crankshaft End Clearance – New or Reground

mm in
0.10 MIN 0.004
0.50 MAX 0.020

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If the crankshaft end play is still less than 0.10 mm [0.004 in], or more than 0.50 mm [0.020 in], the engine must be removed to allow for replacement of the crankshaft. Refer to Procedure 000-001 in Section 0.

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Finishing Steps

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 CAUTION 

The engine must have adequate oil pressure within 15 seconds after starting. If the warning light indicating low oil pressure has not gone out or there is no oil pressure indicated on a gauge within 15 seconds, shut off the engine immediately to reduce the possibility of engine damage. Confirm the correct oil level is in the oil pan.

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Last Modified:  03-Aug-2010