Measuring Main Bearing Clearance - Gaging Plastic Method

Do not rotate the crankshaft while gaging plastic is between the crankshaft journal and the bearing surface.

The crankshaft bearing clearances are critical. Excessive bearing clearance may effect crankshaft position sensor signals and may effect On-Board Diagnostics (OBD) II system operation.

1. Remove the bearing cap M8 side bolts.
   Fig 1: Removing Bearing Cap M8 Side Bolts

   Courtesy of GENERAL MOTORS CORP.
2. Remove the bearing cap M10 bolts and studs.
   Fig 2: Removing Bearing Cap M10 Bolts And Studs

   Courtesy of GENERAL MOTORS CORP.
   NOTE: Refer to FASTENER NOTICE in Cautions and Notices.
3. Install the J 41818  to the bearing cap.

   Tighten 

   Tighten the J 41818  bolts to 11 N.m (100 lb in).

4. Install the J 6125-1B  to the J 41818  in order to remove the bearing cap.
   Fig 3: Installing Crankshaft Bearing Cap Remover Tool

   Courtesy of GENERAL MOTORS CORP.
5. Remove the bearing cap and lower bearing.
   Fig 4: Removing Bearing Cap & Lower Bearing

   Courtesy of GENERAL MOTORS CORP.
6. Install gaging plastic onto the crankshaft journal. Install the gaging plastic the full width of crankshaft bearing journal.
   Fig 5: Installing Gaging Plastic Onto Crankshaft Journal

   Courtesy of GENERAL MOTORS CORP.
7. Install the bearing, bearing cap, bolts and bolt/studs.

   Tighten 

   1. 7.1. Tighten the inner bolts (1-10) a first pass in sequence to 20 N.m (15 lb ft).
   2. 7.2. Tighten the inner bolts (1-10) a final pass in sequence to 80 degrees using the J 36660-A. 
   3. 7.3. Tighten the outer bolt/studs (11-20) a first pass in sequence to 20 N.m (15 lb ft).
   4. 7.4. Tighten the outer bolt/studs (11-20) a final pass in sequence to 53 degrees using the J 36660-A  .
   5. 7.5. Tighten the side cap bolts to 25 N.m (18 lb ft).

      Tighten the bolt on one side of the bearing cap and then tighten the bolt on the opposite side of the same bearing cap.

      Fig 6: Installing Bearing, Bearing Cap, Bolts And Bolt/Studs

      Courtesy of GENERAL MOTORS CORP.
   IMPORTANT: Remove the bearing cap side bolts prior to cap removal.
8. Remove the bearing cap M8 side bolts.
   Fig 7: Removing Bearing Cap M8 Side Bolts

   Courtesy of GENERAL MOTORS CORP.
9. Remove the bearing cap bolts and bolt/studs.
   Fig 8: Removing Bearing Cap Bolts And Bolt/Studs

   Courtesy of GENERAL MOTORS CORP.
10. Use the J 41818  and the J 6125-1B  in order to remove the bearing cap.
    Fig 9: Removing Bearing Cap Using Tool

    Courtesy of GENERAL MOTORS CORP.
11. Measure the gaging plastic at its widest area using the scale supplied with the plastic gaging kit.
    • If the gaging plastic shows irregularity in the journal exceeding 0.025 mm (0.001 in), remove the crankshaft and measure the journal with a micrometer.
    • If the bearing clearance is greater than 0.065 mm (0.0025 in), select and install an undersized bearing set, and measure the clearance with gaging plastic.
    • If clearance cannot be brought to specifications, replace the crankshaft or grind the crankshaft for use with the next undersized bearing.
      Fig 10: Measuring Gaging Plastic At Crankshaft Widest Area

      Courtesy of GENERAL MOTORS CORP.
12. Measure the crankshaft end play.
    1. 12.1. Thrust the crankshaft forward or rearward.
    2. 12.1. Insert a feeler gage between the center crankshaft bearing and the bearing surface of the crankshaft and measure the bearing clearance.

       The proper crankshaft end play clearance is 0.04-0.2 mm (0.0015-0.0078 in).

    3. 12.3. If the bearing clearance is not within specifications:
       • Inspect the thrust surfaces for nicks, gouges or raised metal. Minor imperfections may be removed with a fine stone.
       • Replace the thrust bearings and measure the end play.
       • If the correct measurements cannot be obtained, repair the crankshaft thrust surfaces or replace the crankshaft.
         Fig 11: Measuring Crankshaft End Play Using Tool

         Courtesy of GENERAL MOTORS CORP.