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Crankshaft Main Bearing Replacement (K20C2): Replacement

  1. Engine - Remove
  2. Transmission - Remove
  3. Pressure Plate, Clutch Disc, and Flywheel - Remove (M/T)
  4. Drive Plate - Remove (CVT)
  5. Transmission End Crankshaft Oil Seal - Remove
  6. Cylinder Head - Remove
  7. Oil Pan - Remove
  8. Oil Pump - Remove
  9. Oil Pump Chain - Remove
  10. Baffle Plate - Remove
    Fig 1: Baffle Plate With Torque Specifications
    GHH406709Courtesy of HONDA, U.S.A., INC.
  11. Lower Block - Remove
  12. Crankshaft Main Bearing Clearance - Inspect
    Fig 2: Main Bearings And Lower Block With Torque Specifications
    GHH406710Courtesy of HONDA, U.S.A., INC.
    1. Clean each main journal and the 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, then torque the bolts, in sequence, to 35 N.m (3.6 kgf.m, 26 lbf.ft).

    NOTE: 

    • Apply new engine oil to the bolt threads and flanges.
    • Do not rotate the crankshaft during inspection.

    4. Tighten the bearing cap bolts an additional 41 deg..

    5. Remove the lower block and the bearings again, and measure the widest part of the plastigage.

    Main Bearing-to-Journal Oil Clearance 
    No. 1, No. 2, No. 4, and No. 5 Journals: 
    Standard (New):  0.017-0.041 mm (0.00067-0.00161 in) 
    Service Limit:  0.050 mm (0.00197 in) 
     
    No. 3 Journal: 
    Standard (New):  0.025-0.049 mm (0.00098-0.00193 in) 
    Service Limit:  0.055 mm (0.00217 in) 
    GHH406711Courtesy of HONDA, U.S.A., INC.

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

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

    and start over.

  13. Crankshaft Main Bearing - Select
    Block Bore Code Location 
    GHH406712Courtesy of HONDA, U.S.A., INC.
    		 1. Numbers, letters, or bars have been stamped on either side of the lower block end as a code for the size of each of the five main journal bores. Write down the block bore codes. If you cannot read the codes because of accumulated dirt and dust, do not scrub them with a wire brush or scraper. Clean them only with solvent or detergent.
    Main Journal Code Location 
    GHH406713Courtesy of HONDA, U.S.A., INC.
    		 2. The main journal codes are stamped on the crankshaft.
    Bearing Identification 
    GHH406714Courtesy of HONDA, U.S.A., INC.
    		 3. Use the block bore codes and the main journal codes to select the appropriate replacement bearings from the following table.

    NOTE: 

    • 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.
  14. All Removed Parts - Install
    1. Install the parts in the reverse order of removal.
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