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Home >> Fiat >> 2016 >> 500 Turbo, Standard Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 24 (1.4L 16-Valve Engine (Service Information) 500) >> Engine Block >> Bearing(S), Crankshaft, Main >> Standard Procedure >> Main Bearing Replacement

Main Bearing Replacement

WARNING: This page is about a different car, the 2015 Fiat 500. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Engine Hoist & Load-Leveling Lifting Sling
GC0152420Courtesy of CHRYSLER GROUP, LLC

The main bearings 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 oil clearances. Refer to STANDARD PROCEDURE .

NOTE:

To replace the main bearings, the engine must be removed from the vehicle.

  1. Remove the engine. Refer to REMOVAL .
  2. Remove the rear crankshaft oil seal. Refer to SEAL, CRANKSHAFT OIL, REAR, REMOVAL .
    Fig 2: Oil Filter Housing Oil Return Tube, Gaskets & Bolts
    GC0152702Courtesy of CHRYSLER GROUP, LLC
  3. Remove the engine oil pump. Refer to PUMP, ENGINE OIL, REMOVAL .
  4. Remove the two bolts (1 and 3) and the oil filter housing oil return tube (2).
    Fig 3: Bedplate Cap Bolt Removal Sequence
    GC0152756Courtesy of CHRYSLER GROUP, LLC
  5. Remove the twenty bedplate cap bolts in the sequence shown in illustration and remove the bedplate.
  6. Remove all residual sealant from the cylinder block and bedplate.
    Fig 4: Upper Main Bearings & Bedplate Locating Dowels
    GC0152764Courtesy of CHRYSLER GROUP, LLC
    NOTE:

    Graphic shows crankshaft removed for clarity. The upper center main bearing (1) has the thrust washers attached. Replace only one upper main bearing (1 and 2) at a time.

  7. Slide the upper main bearing half (1 and 2) out from between the crankshaft and the engine block.
  8. If required, select fit new main bearings to the engine block. Refer to STANDARD PROCEDURE .
  9. Lubricate the upper main bearing half (1 and 2) with clean engine oil and slide the bearing into position.
  10. Install two bedplate locating dowels (3).
    Fig 5: Checking Cylinder Head Bolts For Stretching (Necking)
    GC0104468Courtesy of CHRYSLER GROUP, LLC
    CAUTION:

    The bedplate 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.

  11. Check the bedplate 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 6: Lower Main Bearings & Sealant
    GC0152765Courtesy of CHRYSLER GROUP, LLC
  12. Lubricate and install the lower main bearing halves (1) into the bedplate.
  13. Clean the cylinder block and bedplate mating surfaces with isopropyl alcohol in preparation for sealant application.
    CAUTION:

    Engine assembly requires the use of a unique sealant that is compatible with engine oil. Using a sealant other than Mopar® Engine Sealant RTV Silicone Rubber Adhesive may result in engine fluid leakage.

    CAUTION:

    Following the application of Mopar® Engine Sealant RTV Silicone Rubber Adhesive to the gasket surfaces, the components must be assembled within 10 minutes and the attaching fasteners must be tightened to specification within the next 10 minutes. Prolonged exposure to the air prior to assembly may result in engine fluid leakage.

  14. Apply a 2 to 3 mm wide bead of Mopar® Engine Sealant RTV Silicone Rubber Adhesive (2) to the bedplate as shown in illustration.
    Fig 7: Bedplate Cap Bolt Tightening Sequence
    GC0152766Courtesy of CHRYSLER GROUP, LLC
  15. Position the bedplate onto the cylinder block. Make sure the bedplate seats fully over the locating dowels.
  16. Install the twenty bedplate bolts finger tight.
  17. Tighten the bedplate bolts in the sequence shown in illustration, following this 5 step torque plus angle method. Tighten according to the following torque values:
    • Step 1: 1 through 10 to 20 N.m (15 ft. lbs.).
    • Step 2: 11 through 20 to 15 N.m (11 ft. lbs.).
    • Step 3: 1 through 10 again to 20 N.m (15 ft. lbs.).
    • Step 4: 1 through 10 + 80° Turn Do not use a torque wrench for this step. 
    • Step 5: 11 through 20 to 32 N.m (27 ft. lbs.).
  18. Measure crankshaft end play. Refer to STANDARD PROCEDURE .
    Fig 8: Oil Return Tube O-Ring Seal
    GC0152709Courtesy of CHRYSLER GROUP, LLC
  19. Install a new oil filter housing oil return tube O-ring seal (1).
    Fig 9: Oil Filter Housing Oil Return Tube, Gaskets & Bolts
    GC0152702Courtesy of CHRYSLER GROUP, LLC
  20. Install the oil filter housing oil return tube (2) between the bedplate and oil filter housing with two gaskets (4). Tighten the bolt (3) to 9 N.m (80 in. lbs.) and tighten the bolt (1) to 33 N.m (24 ft. lbs.).
  21. Install the engine oil pump, timing belt and sprockets. Refer to PUMP, ENGINE OIL, INSTALLATION .
  22. Install the rear crankshaft oil seal and transmission. Refer to SEAL, CRANKSHAFT OIL, REAR, INSTALLATION .
    Fig 10: Engine Hoist & Load-Leveling Lifting Sling
    GC0152420Courtesy of CHRYSLER GROUP, LLC
  23. Install the engine. Refer to INSTALLATION .
  24. If removed, install the oil filter and fill the engine crankcase with the proper oil to the correct level. Refer to STANDARD PROCEDURE .
  25. Connect the negative battery cable and tighten nut to 5 N.m (45 in. lbs.).
  26. Fill the cooling system. Refer to STANDARD PROCEDURE .
  27. Run the engine until it reaches normal operating temperature. Check cooling system for correct fluid level. Refer to STANDARD PROCEDURE .
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