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 (A) at a point 16 mm(0.63 in) from the bottom of the skirt.
Piston Skirt Diameter

Standard (New): 88.975-88.985 mm

(3.5029-3.5033 in.)

Service Limit: 88.965 mm (3.5026 in.)

Oversize Piston Skirt Diameter

0.25: 89.235 mm (3.51279-3.51318 in)

Fig 1: Measuring 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.
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 7 after reboring.

Cylinder Bore Size

Standard (New): 89.000-89.015 mm

(3.5039-3.5045 in.)

Service Limit: 89.065 mm (3.5065 in.)

Oversize

0.25: 89.250-89.265 mm (3.5138-3.5144 in.)

Reboring Limit: 0.25 mm (0.01 in.)

Bore Taper

Limit: (Difference between first and third measurement) 0.05 mm (0.002 in.)

Fig 2: Measuring Cylinder Bore Size
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Hone any scored or scratched cylinder bores (see CYLINDER BORE HONING ).
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.

Service Limit: 0.10 mm (0.004 in.)

Fig 3: Measuring 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): 0.015-0.040 mm

(0.0006-0.0016 in.)

Service Limit: 0.08 mm (0.003 in.)

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