Block and Piston Inspection

WARNING: This page is about a different car, the 2011 Honda CR-V and 2010 Honda CR-V. However, it is still accessible from the selected car via links, so may be relevant.

Remove the crankshaft and the pistons (see CRANKSHAFT AND PISTON REMOVAL ).
Check the piston for distortion or cracks.
Measure the piston diameter at a point 13 mm (0.5 in) from the bottom of the skirt. There are two standard-size pistons (No Letter or A, and B). The letter is stamped on the top of the piston. Letters are also stamped on the engine block as the cylinder bore sizes.
Piston Skirt Diameter

Standard (New): No Letter (or A): 86.980-86.990 mm (3.4244-3.4248 in)

B: 86.970-86.980 mm (3.4240-3.4244 in)

Service Limit: No Letter (or A): B: 86.930 mm (3.4224 in) 86.920 mm (3.4220 in)

Oversize Piston Skirt Diameter

0.25: 87.230-87.240 mm (3.4342-3.4346 in)

Fig 1: Measuring Piston Diameter
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Measure the wear and taper in direction X and Y at three levels inside 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, refer to step 7 after reboring.
Cylinder Bore Size

Standard (New):

A or I: 87.010-87.020 mm (3.4256-3.4260 in)

B or II: 87.000-87.010 mm (3.4252-3.4256 in)

Service Limit: 87.070 mm (3.4279 in)

Oversize Bore

0.25: 87.250-87.260 mm (3.4350-3.4354 in)

Reboring Limit: 0.025 mm (0.01 in) max.

Bore Taper

Limit (Difference between first 0.02 mm (0.001 in) and third measurement):

Fig 2: Identifying Cylinder Bore Size Dimension
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Scored or scratched cylinder bores must be honed.
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: Precaution For 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 cylinder bore for excessive wear.
Piston-to-Cylinder Bore Clearance

Standard (New): 0.020-0.040 mm (0.0008-0.0016 in)

Service Limit: 0.05 mm (0.002 in)

Fig 4: Identifying Difference Between Cylinder Bore Diameter And Piston Diameter
Courtesy of AMERICAN HONDA MOTOR CO., INC.