LEMON Manuals: Even more car manuals for everyone
Home >> Honda >> 2021 >> CR-V Hybrid Touring >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Control System / Engine Mechanical - Service Information (Hybrid) >> Overhaul >> Engine Block Overhaul >> Inspection

Engine Block Overhaul: Inspection

Connecting Rod and Crankshaft End Play Inspection 

  1. Connecting Rod - Inspect
    GHH378373Courtesy of HONDA, U.S.A., INC.
    		 1. Measure the connecting rod end play with a feeler gauge (A) between the connecting rod (B) and the crankshaft (C).

    2. If the connecting rod end play is beyond the service limit, install a new connecting rod, and recheck. If it is still beyond the service limit, replace the crankshaft.
    Connecting Rod End Play 
    Standard (New):  0.15-0.35 mm (0.0059-0.0138 in) 
    Service Limit:  0.45 mm (0.0177 in) 
  2. Crankshaft End Play - Inspect
    GHH378374Courtesy of HONDA, U.S.A., INC.
    		 1. Push the crankshaft firmly away from the dial indicator by prying, and zero the dial against the end of the crankshaft. Then pull the crankshaft firmly back toward the indicator by prying; the dial reading should not exceed the service limit.

    2. If the crankshaft end play is beyond the service limit, replace the thrust washers and recheck, if it is still beyond the service limit, replace the crankshaft.
    Crankshaft End Play 
    Standard (New):  0.10-0.35 mm (0.0039-0.0138 in) 
    Service Limit:  0.45 mm (0.0177 in) 

Main Bearing Clearance Inspection 

  1. Lower Block and Bearing Half - Remove
  2. Main Bearing Clearance - Inspect
    GHH378375GHH378376Courtesy of HONDA, U.S.A., INC.HONDA, U.S.A., INC.
    GHH378375GHH378376Courtesy of HONDA, U.S.A., INC.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 to 30 N.m (3.1 kgf.m, 22 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 50°.
    GHH378377Courtesy of HONDA, U.S.A., INC.
    		 5. Remove the lower block and the bearings again, and measure the widest part of the plastigage.

    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.
    Main Bearing-to-Journal Oil Clearance 
    Standard (New):  0.017-0.035 mm (0.00067-0.00138 in) 
    Service Limit:  0.045 mm (0.00177 in) 
  3. Crankshaft Main Bearing - Select
    GHH378378Courtesy of HONDA, U.S.A., INC.
    		 Crankshaft Bore Code Location 

    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.
    GHH378379Courtesy of HONDA, U.S.A., INC.
    		 Main Journal Code Location 

    2. The main journal codes are stamped on the crankshaft.
    GHH378380Courtesy 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.

Connecting Rod Bearing Clearance Inspection 

  1. Connecting Rod Bearing Cap and Bearing Half - Remove
  2. Connecting Rod Bearing Clearance - Inspect
    GHH378381Courtesy of HONDA, U.S.A., INC.
    		 1. Clean the connecting rod journal and the bearing half with a clean shop towel.

    2. Place plastigage across the rod journal.

    3. Reinstall the bearing half and the cap, then torque the bolts to 20 N.m (2.0 kgf.m, 15 lbf.ft) +90°.

    NOTE: 

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

    4. Remove the connecting rod bearing cap and the bearing half, and measure the widest part of the plastigage.

    Connecting Rod Bearing-to-Journal Oil Clearance 

    5. If the plastigage measures too wide or too narrow, remove the cap, and 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.

    6. 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 the clearance again. If the proper clearance cannot be obtained by using the appropriate larger or smaller bearings, replace the crankshaft and start over.
    Standard (New):  0.024-0.042 mm (0.00094-0.00165 in) 
  3. Connecting Rod Bearing - Select
    GHH378382Courtesy of HONDA, U.S.A., INC.
    		 1. Inspect each connecting rod for cracks and heat damage.

    Big End Bore Code Locations 

    2. Each connecting rod has a tolerance range from 0 to 0.024 mm (0.00094 in), in 0.006 mm (0.00024 in) increments, depending on the size of its big end bore. It's then stamped with a number or bar (1, 2, 3, or 4/l, ll, lll, or llll) indicating the range. You may find any combination of numbers and bars in any engine. (Half the number or bar is stamped on the rod cap, the other half is on the connecting rod.) If you cannot read the code because of an accumulation of oil and varnish, do not scrub it with a wire brush or scraper. Clean it only with solvent or detergent.
    Big End Bore Size:  48.0 mm (1.890 in) 
    GHH378383Courtesy of HONDA, U.S.A., INC.
    		 Connecting Rod Journal Code Location 

    3. The connecting rod journal codes are stamped on the crankshaft in either location.
    GHH378384Courtesy of HONDA, U.S.A., INC.
    		 4. Use the big end bore codes and the rod journal codes to select 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.

Crankshaft Inspection 

  1. Crankshaft - Inspect

    Out-of-Round and Taper 

    1. Clean the crankshaft oil passages with pipe cleaners or a suitable brush.

    GHH378385Courtesy of HONDA, U.S.A., INC.

    2. Check the keyway slot and the threaded holes.

    3. Measure the out-of-round at the middle of each rod and main journal in two places. The difference between measurements on each journal must not be more than the service limit.

    Journal Out-of-Round 
    Standard (New):  0.005 mm (0.00020 in) max. 
    Service Limit:  0.010 mm (0.00039 in) 

    4. Measure the taper at the edges of each rod and the main journal. The difference between measurements on each journal must not be more than the service limit.

    Journal Taper 
    Standard (New):  0.005 mm (0.00020 in) max. 
    Service Limit:  0.010 mm (0.00039 in) 

    Straightness 

    5. Place the V-blocks on a flat surface.

    GHH378386Courtesy of HONDA, U.S.A., INC.

    6. Check the total runout with the crankshaft supported on V-blocks.

    7. Measure the runout on all of the main journals. Rotate the crankshaft two complete revolutions. The difference between measurements on each journal must not be more than the service limit.

    Crankshaft Total Runout 
    Standard (New):  0.03 mm (0.0012 in) 
    Service Limit:  0.04 mm (0.0016 in) 

Piston, Ring, Pin, and Connecting Rod Inspection 

  1. Piston Ring End Gap - Inspect

    1. Using a piston that has its rings removed, push a new ring (A) into the cylinder bore 15-20 mm (0.59-0.79 in) from the bottom.

    GHH378387Courtesy of HONDA, U.S.A., INC.

    2. Measure the piston ring end-gap (B) with a feeler gauge:

    • If the gap is too small, check to see if you have the proper rings for your engine.
    • If the gap is too large, recheck the cylinder bore diameter against the wear limits. If the bore is beyond the service limit, the engine block must be rebored.
    Piston Ring End-Gap 
    Top Ring 
    Standard (New):  0.20-0.30 mm (0.0079-0.0118 in) 
    Service Limit:  0.60 mm (0.0236 in) 
    Second Ring 
    Standard (New):  0.30-0.42 mm (0.0118-0.0165 in) 
    Service Limit:  0.70 mm (0.0276 in) 
    Oil Ring 
    Standard (New):  0.20-0.50 mm (0.0079-0.0197 in) 
    Service Limit:  0.80 mm (0.0315 in) 
  2. Piston Pin - Inspect

    1. Measure the diameter of the piston pin.

    Piston Pin Diameter 
    Standard (New):  17.960-17.964 mm (0.70709-0.70724 in) 
    Service Limit:  17.960 mm (0.70709 in) 
    GHH378388Courtesy of HONDA, U.S.A., INC.
    GHH378389Courtesy of HONDA, U.S.A., INC.
    		 2. Zero the dial indicator (A) to the piston pin diameter.

    3. Check the difference between the piston pin diameter and the piston pin hole diameter in the piston.

    Piston Pin-to-Piston Clearance 
    Standard (New):  -0.004-0.003 mm (-0.00016-0.00012 in) 
    Service Limit:  0.006 mm (0.00024 in) 
    GHH378390Courtesy of HONDA, U.S.A., INC.

    4. Measure the piston pin-to-connecting rod clearance.

    Piston Pin-to-Connecting Rod Clearance 
    Standard (New):  0.004-0.016 mm (0.00016-0.00063 in) 
    Service Limit:  0.020 mm (0.00079 in) 
    GHH378391Courtesy of HONDA, U.S.A., INC.
  3. Piston Ring-to-Piston Ring Groove Clearance - Inspect

    1. After installing a new set of rings, measure the ring-to-groove clearances:

    Top Ring Clearance 
    Standard (New):  0.045-0.085 mm (0.00177-0.00335 in) 
    Service Limit:  0.165 mm (0.00650 in) 
    Second Ring Clearance 
    Standard (New):  0.030-0.055 mm (0.00118-0.00217 in) 
    Service Limit:  0.125 mm (0.00492 in) 
    GHH378392Courtesy of HONDA, U.S.A., INC.

Block and Piston Inspection 

  1. Block and Piston - Inspect
    GHH378393GHH378394Courtesy of HONDA, U.S.A., INC.HONDA, U.S.A., INC.
    GHH378393GHH378394Courtesy of HONDA, U.S.A., INC.HONDA, U.S.A., INC.
    		 1. Check the pistons for distortion or cracks.

    2. Measure the piston skirt diameter at a point 14 mm (0.55 in) from the bottom of the skirt.
    Piston Skirt Diameter 
    Service Limit:  80.93 mm (3.1862 in) 
    Oversize Piston 0.25 mm (0.0098 in) 
    Skirt Diameter 
    Service Limit:  81.18 mm (3.1961 in) 
    GHH378395Courtesy of HONDA, U.S.A., INC.
    		 3. Measure the wear and taper in direction X and Y at three levels inside each cylinder as shown. If measurements in any cylinder are beyond the oversize bore service limit, replace the engine block.

    4. Hone any cored or scratched cylinder bores if needed.
    Bore Taper   
    Limit:  (Difference between first and third measurement) 0.050 mm (0.00197 in) 
    Reboring limit:  0.25 mm (0.0098 in) max. 
    Oversize Bore 
    Oversize Bore:  + 0.25 mm (0.0098 in) 
    Cylinder Bore Size 
    Standard (New): 
    X:  81.000-81.020 mm (3.18897-3.18976 in) 
    Y:  81.000-81.015 mm (3.18897-3.18956 in) 
    Service Limit:  81.070 mm (3.19173 in) 

    5. Check the top of the engine block for warpage. Measure along the edges and across the center as shown.

    Engine Block Warpage 
    Standard (New):  0.07 mm (0.0028 in) max. 
    GHH378396Courtesy of HONDA, U.S.A., INC.
    GHH378397Courtesy of HONDA, U.S.A., INC.

    6. Calculate the difference between the cylinder bore diameter and the piston diameter. If the clearance is near, or exceeds the service limit, inspect the piston and the cylinder bore for excessive wear.

    Piston-to-Cylinder Bore Clearance 
    Service Limit:  0.050 mm (0.00197 in) 
    GHH378398Courtesy of HONDA, U.S.A., INC.
scientia non olet · About LEMON Manuals