Inspection and Service
INSPECTION
1. Measure wear and taper in direction X and Y at three levels in each cylinder as shown.
Cylinder Bore Size:
Standard (New): 81.00 - 81.02 mm (3.189 - 3.190 inches)
Service Limit: 81.07 mm (3.192 inches)
Oversize: 0.25: 81.25 - 81.27 mm (3.199 - 3.200 inches)
Bore Taper:
Service Limit: (Difference between first and third measurement) 0.05 mm (0.002 inch)
- If measurements in any cylinder are beyond Oversize Bore Service Limit, replace the block.
- If the block is to be rebored, refer to Piston Clearance Inspection after reboring.
NOTE: Scored or scratched cylinder bores must be honed.
Reboring Limit: 0.25 mm (0.01 inch)
Surfaces To Be Measured:
2. Check the top of the block for warpage. Measure along the edges and across the center as shown.
Engine Block Warpage:
B18B1 engine:
Standard (New): 0.07 mm (0.003 inch) max.
Service Limit: 0.10 mm (0.004 inch)
B18C1, B18C5 engines:
Standard (New): 0.05 mm (0.002 inch) max.
Service Limit: 0.08 mm (0.003 inch)
BORE HONING
1. Measure cylinder bores.
If the block is to be reused, hone the cylinders and remeasure the bores.
2. Hone cylinder bores with honing oil and a fine (400 grit) stone in a 60 degree cross-hatch pattern.
NOTE:
- Use only a rigid hone with 400 grit or finer stone such as Sunnen, Ammco, or equivalent.
- Do not use stones that are worn or broken.
3. When honing is complete, thoroughly clean the cylinder block of all metal particles. Wash the cylinder bores with hot soapy water, then dry and oil immediately to prevent rusting.
NOTE: Never use solvent, it will only redistribute the grit on the cylinder walls.
4. If scoring or scratches are still present in cylinder bores after honing to the service limit, rebore the engine block.
NOTE: Some light vertical scoring and scratching is acceptable if it is not deep enough to catch your fingernail and does not run the full length of the bore.
NOTE:
- After honing, clean the cylinder thoroughly with soapy water.
- Only scored or scratched cylinder bores must be honed.