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Crankshaft Main Bearing Replacement: Replacement

  1. Engine/Transmission - Remove
  2. Transmission - Remove
    1. Remove the transmission:
  3. Pressure Plate, Clutch Disc, and Flywheel - Remove (M/T)
  4. Drive Plate - Remove (CVT)
  5. Cylinder Head - Remove
  6. Lower Block and Bearing Half - Remove 

    NOTE:  Do not remove the connecting rod cap.

  7. Main Bearing Clearance Inspect
    Fig 1: Main Bearings / Lower Block Bolt Tightening Sequence With Torque Specifications
    GHH435270GHH435271Courtesy of HONDA, U.S.A., INC.HONDA, U.S.A., INC.
      1. Clean each main journal and main bearing half with a clean shop towel.

    2. Place one strip of plastigage across each main journal.

    3. Reinstall the main bearings and the lower block. Tighten the bolts in three steps; tighten the bolts until the bolts sit on the lower block, tighten the bolts until the liquid gasket is compressed, tighten the bolts to specified torque.

    NOTE: 

    • Apply new engine oil to the bolt threads and flanges.
    • Do not rotate the crankshaft during inspection.
    GHH435271Courtesy of HONDA, U.S.A., INC.
    		 4. Tighten the bearing cap bolts an additional 57 deg. in the number sequence shown.
    GHH435272Courtesy of HONDA, U.S.A., INC.
    		 5. Remove the lower block and the main bearings, and measure the widest part of the plastigage.

    Main Bearing-to-Journal Oil Clearance 

    6. If the plastigage measures too wide or too narrow, remove the crankshaft, and remove the upper half of the main bearing. Install a new, complete main bearing with the same color code, and recheck the clearance. Do not file, shim, or scrape the main bearings or the caps to adjust clearance.

    7. If the plastigage shows the clearance is still incorrect, try the next larger or smaller main bearing (the color listed above or below that one), and check the clearance again. If the proper clearance cannot be obtained by using the appropriate larger or smaller main bearings, replace the crankshaft 

    and start over.
    Standard (New):  0.018-0.034 mm (0.00071-0.00134 in) 
    Service Limit:  0.045 mm (0.00177 in) 
  8. Crankshaft Main Bearing - Select
    Block Bore Code Locations 
    GHH435273GHH435274GHH435275Courtesy of HONDA, U.S.A., INC.HONDA, U.S.A., INC.HONDA, U.S.A., INC.

    Main Journal Code Locations 

    GHH435273GHH435274GHH435275Courtesy of HONDA, U.S.A., INC.HONDA, U.S.A., INC.HONDA, U.S.A., INC.
    GHH435273GHH435274GHH435275Courtesy of HONDA, U.S.A., INC.HONDA, U.S.A., INC.HONDA, U.S.A., INC.
    		 1. Numbers, letters, or bars have been stamped on either side of the lower block as a code for the size of each of the five main journal bores. Use them, and the numbers stamped on the crankshaft (codes for main journal size), to choose the correct main bearings.
    NOTE: 

    If the codes are indecipherable because of an accumulation of dirt and dust, do not scrub them with a wire brush or scraper. Clean them only with solvent or detergent.

    2. Use the block bore codes and the main journal codes to select the appropriate replacement main bearings from the following table.

    • Color code is on the edge of the bearing.
    • When using bearing halves of different colors, it does not matter which color is used in the top or bottom.
  9. All Removed Parts - Install
    1. Install the parts in the reverse order of removal.
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