Block and Piston Inspection

1. Remove the pistons from the engine block .
2. Check the pistons for distortion or cracks.
3. Measure the piston skirt diameter at a point 16 mm (0.63 in) from the bottom of the skirt.

   J35Z6 engine 

   Piston Skirt Diameter 

   Standard (New): 88.975- 88.985 mm (3.50295- 3.50334 in) 

   Service Limit: 88.965 mm (3.50255 in) 

   Oversize Piston Skirt Diameter 

   0.25: 89.225- 89.235 mm (3.51279- 3.51318 in) 

   J37A4 engine 

   Piston Skirt Diameter 

   Standard (New): 89.983- 89.996 mm (3.54263- 3.54314 in) 

   Service Limit: 89.975 mm (3.54232 in) 

   Fig 1: Measuring Piston Skirt Diameter From Bottom Of Skirt

   Courtesy of AMERICAN HONDA MOTOR CO., INC.
4. Measure the wear and taper in direction X and Y at three levels in each cylinder as shown in illustration above.
5. J35Z6 engine: If the measurements in any cylinder are beyond the oversize bore service limit, replace the engine block. If the engine block has to be rebored, refer to step  8 after reboring.

   J37A4 engine: If the measurements in any cylinder are beyond the service limit, replace the engine block. The J37A4 engine block can not be rebored.

   J35Z6 engine 

   Cylinder Bore Size 

   Standard (New): 89.000- 89.015 mm (3.50393- 3.50452 in) 

   Service Limit: 89.065 mm (3.50649 in) 

   Oversize 

   0.25: 89.250- 89.265 mm (3.51377- 3.51436 in) 

   Reboring Limit: 0.25 mm (0.0098 in) 

   Bore Taper 

   Limit: (Difference between first and third measurement) 0.05 mm (0.0020 in) 

   J37A4 engine Cylinder Bore Size 

   Standard (New): 90.000- 90.015 mm (3.54330- 3.54389 in) 

   Service Limit: 90.065 mm (3.54586 in) 

   Bore Taper 

   Limit: (Difference between first and third measurement) 0.05 mm (0.0020 in) 

   Fig 2: Measuring Wear And Taper In Direction X And Y At Three Levels In Each Cylinder

   Courtesy of AMERICAN HONDA MOTOR CO., INC.
6. J35Z6 engine : Hone any scored or scratched cylinder bores.
   NOTE: The J37A4 engine can not be honed. If the cylinders are damaged, the engine block must be replaced.
7. Check the top of the engine block for warpage. Measure along the edges and across the center as shown in illustration below.

   Engine Block Warpage 

   Standard (New): 0.07 mm (0.002 in) max. 

   Service Limit: 0.10 mm (0.003 in) 

   Fig 3: Identifying Top Of Engine Block For Warpage

   Courtesy of AMERICAN HONDA MOTOR CO., INC.
   Fig 4: Checking Top Of Engine Block For Warpage Using Precision Straight Edge

   Courtesy of AMERICAN HONDA MOTOR CO., INC.
8. 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.

J35Z6 engine 

Piston-to-Cylinder Bore Clearance 

Standard (New): 0.015- 0.040 mm (0.001- 0.001 in) 

Service Limit: 0.08 mm (0.003 in) 

J37A4 engine 

Piston-to-Cylinder Bore Clearance 

Standard (New): 0.004- 0.032 mm (0.001- 0.001 in) 

Service Limit: 0.07 mm (0.002 in) 

Fig 5: Identifying Difference Between Cylinder Bore Diameter And Piston Diameter

Courtesy of AMERICAN HONDA MOTOR CO., INC.