Block and Piston Inspection: Inspection

Crankshaft - Remove
Piston - Remove

Block - Inspect

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

1. 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 is being rebored, check the piston-to-cylinder bore clearance.

Cylinder Bore Size

Standard (New):
Direction X:	73.000-73.020 mm (2.87401-2.87480 in)
Direction Y:	73.000-73.015 mm (2.87401-2.87460 in)
Service Limit:	73.065 mm (2.87657 in)

Oversize

0.25:

73.250-73.265 mm (2.88385-2.88444 in)

Reboring limit:

0.25 mm (0.0098 in) max.

Bore Taper

Limit:

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

2. Hone any cored or scratched cylinder bores if needed.

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

3. 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.

Piston - Inspect

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1. Check the piston for distortion or cracks

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

Piston Diameter

Standard (New):	72.980-72.990 mm (2.87322-2.87362 in)
Service Limit:	72.970 mm (2.87283 in)

Oversize Piston Diameter

0.25:

74. 24 mm (2

75. 8835 in)

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

3. 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 engine block for excessive wear.

Piston-to-Cylinder Clearance

Standard (New):	0.010-0.035 mm (0.00039-0.00138 in)
Service Limit:	0.05 mm (0.0020 in)

All Removed Parts - Install

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