LEMON Manuals: Even more car manuals for everyone
Home >> Jeep >> 2021 >> Gladiator Mojave, Part Time T/Case Control, Standard Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 14 (3.6L Engine (Service Information)) >> Engine Block >> Bearing(S), Crankshaft, Main >> Standard Procedure >> Main Bearing Replacement

Main Bearing Replacement

WARNING: This page is about a different car, the 2022 Chrysler Voyager and 2022 Chrysler Pacifica. However, it is still accessible from the selected car via links, so may be relevant.
GC0095519Courtesy of CHRYSLER GROUP, LLC

The main bearings are serviced in-vehicle. They must be replaced one-at-a-time in order to properly support the crankshaft. The upper and lower main bearing shells are NOT interchangeable. The upper and lower main bearings are "select fit" to achieve proper specification oil clearances. Refer to BEARING(S), CRANKSHAFT, MAIN, STANDARD PROCEDURE .

  1. Disconnect and isolate the negative battery cable. If equipped with an Intelligent Battery Sensor (IBS), disconnect the IBS connector first before disconnecting the negative battery cable.
    GC0144278Courtesy of CHRYSLER GROUP, LLC
  2. Remove the oil pan, oil pump pick-up and engine oil pump. Refer to PUMP, ENGINE OIL, REMOVAL AND INSTALLATION .
  3. Remove the eight main bearing cap bolts from the windage tray in the sequence shown in illustration and remove the windage tray (1).
    Fig 1: Main Bearing Tie Bolts Removal Sequence
    GC0144290Courtesy of CHRYSLER GROUP, LLC
  4. Remove the eight main bearing tie bolts in the sequence shown in illustration.
    CAUTION:

    DO NOT use a number stamp or a punch to mark main bearing caps, as damage to main bearings could occur.

    NOTE:

    Main bearing caps are not interchangeable and are marked to insure correct assembly.

  5. Mark the main bearing cap positions using a permanent ink marker or a scribe tool.
    GC0144291Courtesy of CHRYSLER GROUP, LLC
    CAUTION:

    Replace only one main bearing at a time while all other main bearing caps remain properly tightened. If all main bearing caps are removed, the weight of the unsupported crankshaft will damage the crankshaft oil seals.

    NOTE:

    Replace the main bearings in the following order; 2, 3, 1, 4.

  6. Remove the two cap bolts (2) and remove the main bearing cap (1).
  7. When removing the No. 2 bearing cap, also remove the thrust washers (5).
  8. Slide the upper main bearing half (6) out from between the crankshaft and the engine block.
  9. Inspect the crankshaft and bearings for abnormal wear patterns, scoring, grooving, fatigue, pitting and for metal or other foreign material imbedded in the lining. Refer to ENGINE BLOCK, INSPECTION .
  10. If required, check the crankshaft bearing clearances by the use of Plastigage or equivalent. Refer to CONNECTING ROD BEARING FITTING  .
  11. If required, select fit new main bearings to the engine block. Refer to BEARING(S), CRANKSHAFT, MAIN, STANDARD PROCEDURE .
  12. Lubricate the upper main bearing half (6) with clean engine oil and slide the bearing into position.
    GC0095520Courtesy of CHRYSLER GROUP, LLC
  13. When installing the thrust washers (1) at the No. 2 main bearing location, use the following procedure:
    1. Move the crankshaft forward to the limit of travel. Lubricate and install the front thrust washer (1) by rolling the washer onto the machined shelf between the No. 2 upper main bulk head and crankshaft thrust surface.
    2. Move the crankshaft rearward to the limit of travel. Lubricate and install the rear thrust washer by rolling the washer onto the machined shelf between the No. 2 upper main bulk head and crankshaft thrust surface.
    GC0104468Courtesy of CHRYSLER GROUP, LLC
    CAUTION:

    The main bearing cap bolts are tightened using a torque plus angle procedure. The bolts must be examined BEFORE reuse. If the threads are necked down the bolts must be replaced.

  14. Check the main bearing cap bolts for necking by holding a scale or straight edge against all of the threads. If all of the threads do not contact the scale (2) the bolt must be replaced.
    GC0144291Courtesy of CHRYSLER GROUP, LLC
  15. Lubricate and install the lower bearing half (3) onto the main cap (1).
  16. Install the main bearing cap (1) with two inner main bearing cap bolts (2). Partially thread the bolts prior to fully inserting the bearing caps to ensure correct alignment. Tighten to the proper torque specifications. Refer to TORQUE SPECIFICATIONS  .
  17. Repeat the previous steps for main bearings 3, 1 and 4.
  18. Measure crankshaft end play. Refer to CRANKSHAFT END PLAY  .
    GC0144281Courtesy of CHRYSLER GROUP, LLC
  19. Position the windage tray on to the engine block.
  20. Install the windage tray with eight main bearing cap bolts. Tighten the bolts in the sequence shown in illustration to the proper torque specifications. Refer to TORQUE SPECIFICATIONS  .
    Fig 2: Main Bearing Tie Bolts Installation Sequence
    GC0144292Courtesy of CHRYSLER GROUP, LLC
  21. Install the eight main bearing tie bolts. Tighten the bolts in the sequence shown in illustration to the proper torque specifications. Refer to TORQUE SPECIFICATIONS  .
  22. Install the engine oil pump, oil pump pick-up and oil pan. Refer to PUMP, ENGINE OIL, REMOVAL AND INSTALLATION .
  23. Install the spark plugs and ignition coils. Refer to SPARK PLUG, REMOVAL AND INSTALLATION .
  24. Install a new oil filter and fill the engine crankcase with the proper specification oil to the correct level. Refer to OIL, STANDARD PROCEDURE .
  25. Connect the negative battery cable. If equipped with an Intelligent Battery Sensor (IBS), connect the IBS connector.
  26. Operate the engine until it reaches normal operating temperature and inspect for leaks.
scientia non olet · About LEMON Manuals