Block and Piston Inspection

Remove the piston from the engine block (see CRANKSHAFT AND PISTON REMOVAL ).
Check the piston for distortion or cracks.
Measure the piston diameter at a point 16.0 mm (0.63 in.) from the bottom of the skirt.
Piston Diameter

Standard (New): 89.983-89.996 mm (3.5426-3.5431 in.)

Fig 1: Identifying Piston Diameter
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Measure wear and taper in direction X and Y at three levels in each cylinder as shown.If the measurements in any cylinder are beyond the service limit, replace the engine block
Cylinder Bore Size

Standard (New): 90.000-90.015 mm (3.5433-3.5439 in.)

Fig 2: Identifying Cylinder Bore Size
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 shown.:
Engine Block Warpage

Standard (New): 0.07 mm (0.003 in.) max.

Fig 3: Identifying Engine Block Warpage
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Calculate the difference between cylinder bore diameter and piston diameter. If the clearance is near or exceeds the service limit, inspect the piston and cylinder bore for excessive wear.
Piston-to-Cylinder Bore Clearance

Standard (New): 0.004-0.032 mm (0.0002-0.0013 in.)

Service Limit: 0.08 mm (0.003 in.)

Fig 4: Identifying Piston-To-Cylinder Bore Clearance
Courtesy of AMERICAN HONDA MOTOR CO., INC.