Block and Piston Inspection

Remove the pistons from the engine block (see CRANKSHAFT AND PISTON REMOVAL ).
Check the pistons for distortion or cracks.
Measure the piston skirt diameter at a point 16 mm (0.63 in) from the bottom of the skirt.
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: Identifying Piston Skirt Diameter
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Fig 2: Checking Piston Skirt Diameter
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Measure the wear and taper in direction X and Y at three levels in each cylinder as shown in the illustration.
If the measurements in any cylinder are beyond the service limit or the cylinders are damaged, replace the engine block.
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

Fig 3: Identifying Cylinder Bore Size
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Fig 4: Measuring Wear And Taper In Direction X And Y At Three Levels In Cylinder
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Check the top of the engine block for warpage. Measure along the edges and across the center as shownin the illustration.
Engine Block Warpage

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

Service Limit: 0.10 mm (0.003 in)

Fig 5: Identifying Engine Block Warpage
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Fig 6: Checking Engine Block Warpage
Courtesy of AMERICAN HONDA MOTOR CO., INC.
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

Standard (New): 0.004-0.032 mm (0.00016-0.00126 in)

Service Limit: 0.07 mm (0.0028 in)

Fig 7: Checking Piston-To-Cylinder Bore Clearance
Courtesy of AMERICAN HONDA MOTOR CO., INC.