Piston: Testing and Inspection
INSPECTION1. Check the piston for distortion or cracks.
NOTE: If a cylinder is bored, an oversized piston must be used.
2. Measure the piston diameter at a distance A from bottom of the skirt.
B16A2 engine:
A: 15 mm (0.6 inch)
D16Y5, D16Y7, D16Y8 engines:
A: 5 mm (0.2 inch)
Piston Diameter:
B16A2 engine:
Standard (New): 80.980 - 80.990 mm (3.1882 - 3.1886 inch)
Service Limit: 80.970 mm (3.1878 inch)
D16Y5, D16Y7, D16Y8 engines:
Standard (New): 74.980 - 74.990 mm (2.9520 - 2.9524 inch)
Service Limit: 74.970 mm (2.9516 inch)
3. Calculate the difference between the cylinder bore diameter and the piston diameter.
Piston-to-Cylinder Clearance
Standard (New): 0.010 - 0.040 mm (0.0004 - 0.0016 inch)
Service Limit: 0.05 mm (0.002 inch)
If the clearance is near or exceeds the service limit, inspect the piston and cylinder block for excessive wear.
Oversize Piston Diameter
B16A2 engine:
0.25: 81.23 - 81.24 mm (3.1980 - 3.1984 inch)
D16Y5, D16Y7, D16Y8 engines:
0.25: 75.23 - 75.24 mm (2.9618 - 2.9622 inch)
0.50: 75.48 - 75.49 mm (2.9716 - 2.9720 inch)