Block and Piston Inspection: Inspection

Piston - Remove
Crankshaft - Remove

Block and Piston - Inspect

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

1. Check the pistons for distortion or cracks.

2. Measure the piston skirt diameter at a point 16 mm (0.63 in) from the bottom of the skirt.

Piston Skirt Diameter

Oversize Piston Skirt Diameter

0.25:

89.225-89.235 mm (3.51279-3.51318 in)

Standard (New):	88.975-88.985 mm (3.50295-3.50334 in)
Service Limit:	88.965 mm (3.50255 in)

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

3. Measure the wear and taper in direction X and Y at three levels in each cylinder as shown. If measurements in any cylinder are beyond the oversize bore service limit or the cylinders are damaged, replace the engine block. If the engine block has to be rebored, refer to step 6 after reboring.

Cylinder Bore Size

Oversize

Bore Taper

4. Hone any scored or scratched cylinder bores .

Limit:

(Difference between first and third measurement) 0.025 mm (0.00098 in)

Reboring Limit:

0.25 mm (0.0098 in)

0.25:

89.250-89.265 mm (3.51377-3.51436 in)

Standard (New):	89.000-89.015 mm (3.50393-3.50452 in)
Service Limit:	89.065 mm (3.50649 in)

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

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 (0.002 in) max.

Courtesy 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

Standard (New):	0.015-0.040 mm (0.00059-0.00157 in)
Service Limit:	0.08 mm (0.0031 in)

All Removed Parts - Install

1. Install the parts in the reverse order of removal.