Main Bearing Replacement

Fig 1: Main Bearing Identification

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The upper and lower main bearings are "select fit" to achieve proper oil clearances. Refer to BEARING(S), CRANKSHAFT, MAIN - STANDARD PROCEDURE  .

1. Disconnect and isolate the negative battery cable.
   Fig 2: Intermediate Shaft & Right Halfshaft

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2. Raise and support the vehicle. Refer to HOISTING, STANDARD PROCEDURE .
3. On FWD vehicles, remove the right halfshaft assembly (2) and the intermediate shaft. Refer to REMOVAL .
   Fig 3: Removing/Installing Power Transfer Unit

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4. If equipped with AWD, remove the PTU (1). Refer to REMOVAL .
   Fig 4: Oil Pan Mounting Bolts

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5. Remove the oil pan, oil pump pick-up and engine oil pump. Refer to PUMP, ENGINE OIL, REMOVAL .
   Fig 5: Belt Tensioner, Accessory Drive Belt & Belt Routing

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6. Remove the accessory drive belt (7). Refer to BELT, SERPENTINE, REMOVAL .
   Fig 6: A/C Compressor & Bolts

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7. Remove the bolts (1 and 3) and reposition the A/C compressor (2).
   Fig 7: Heater Core Return Tube, Nut & Bolt

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   Remove the nut (2), bolt (3) and reposition the heater core return tube (1).

   Fig 8: Front Engine Mount Bracket & Bolts

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8. Remove the three bolts (2) and the front engine mount bracket (1).
   Fig 9: Main Bearing Cap Bolts From Windage Tray Removal Sequence

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9. Remove the eight main bearing cap bolts from the windage tray in the sequence shown in illustration and remove the windage tray (1).
   Fig 10: Main Bearing Tie Bolts Removal Sequence

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   NOTE:

   Typical V6 engine configuration shown in illustration.

10. 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.

11. Mark the main bearing cap positions using a permanent ink marker or a scribe tool.
    Fig 11: Main Bearing Caps, Bolts, Crankshaft & Engine Block

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    NOTE:

    Typical V6 engine configuration shown in illustration.

    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.

12. Remove the two cap bolts (2) and remove the main bearing cap (1).
13. When removing the No. 2 bearing cap, also remove the thrust washers (5).
14. Slide the upper main bearing half (6) out from between the crankshaft and the engine block.
15. If required, select fit new main bearings to the engine block. Refer to BEARING(S), CRANKSHAFT, MAIN - STANDARD PROCEDURE  .
16. Lubricate the upper main bearing half (6) with clean engine oil and slide the bearing into position.
    Fig 12: Thrust Washer Installation

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    NOTE:

    Typical V6 engine configuration shown in illustration.

17. When installing 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.
    Fig 13: Checking Cylinder Head Bolts For Stretching (Necking)

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    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.

18. Check the main bearing cap bolts for necking by holding a scale or straight edge against the threads. If all the threads do not contact the scale (2) the bolt must be replaced.
    Fig 14: Main Bearing Caps, Bolts, Crankshaft & Engine Block

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    NOTE:

    Typical V6 engine configuration shown in illustration.

19. Lubricate and install the lower bearing half (3) onto the main cap (1).
20. Install the main bearing cap (1) with two inner main bearing cap bolts (2) tightened to 20 N.m (15 ft. lbs.) plus 90°.
21. Repeat the previous steps for main bearings 3, 1 and 4.
22. Measure crankshaft end play. Refer to CRANKSHAFT - STANDARD PROCEDURE  .
    Fig 15: Windage Tray With Main Bearing Cap Bolts Installation Sequence

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23. Install the windage tray with eight main bearing cap bolts. Tighten the bolts in the sequence shown in illustration to 21 N.m (16 ft. lbs.) plus 90°.
    Fig 16: Main Bearing Tie Bolts Installation Sequence

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    NOTE:

    Typical V6 engine configuration shown in illustration.

24. Install the eight main bearing tie bolts. Tighten the bolts in the sequence shown in illustration to 28 N.m (21 ft. lbs.).
    Fig 17: Front Engine Mount Bracket & Bolts

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25. Install the front engine mount bracket (1). Tighten bolts (2) to 55 N.m (41 ft. lbs.).
    Fig 18: A/C Compressor & Bolts

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26. Install the A/C compressor and hand tighten all the bolts (1 and 3) that secure the A/C compressor to the engine. Then tighten the bolts to 25 N.m (18 ft. lbs.).
    Fig 19: Belt Tensioner, Accessory Drive Belt & Belt Routing

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27. Install the accessory drive belt (7). Refer to BELT, SERPENTINE, INSTALLATION .
    Fig 20: Removing/Installing Power Transfer Unit

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28. If equipped with AWD, install the PTU (1). Refer to INSTALLATION .
    Fig 21: Aft Crossmember, Crossunder Pipe & Catalytic Converters

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29. Install the engine oil pump, oil pump pick-up, oil pans, oil level indicator, front fore-aft crossmember (1) and crossunder pipe (2). Refer to PUMP, ENGINE OIL, INSTALLATION .
    Fig 22: Heater Core Return Tube, Nut & Bolt

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30. Install the heater core return tube (1) with the nut (2) and bolt (3). Tighten the fasteners to 12 N.m (106 in. lbs.).
    Fig 23: Intermediate Shaft & Right Halfshaft

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31. If removed, install the intermediate shaft and right halfshaft assembly (2). Refer to INSTALLATION .
    Fig 24: Spark Plug Tubes

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32. Install the spark plugs and ignition coils. Refer to SPARK PLUG, INSTALLATION .
33. If removed, install the oil filter and fill the engine crankcase with the proper oil to the correct level. Refer to OIL - STANDARD PROCEDURE  .
34. Connect the negative battery cable and tighten nut to 5 N.m (45 in. lbs.).
35. Operate the engine until it reaches normal operating temperature.