Cylinder Bore Honing

The cylinder liners are made with FRM (fiber reinforced metal). Hone the cylinders only as described here.

1. Measure the cylinder bores (see BLOCK AND PISTON INSPECTION  ). If the engine block is to be reused, hone the cylinders and remeasure the bores. Scored or scratched cylinder bores must be honed.
2. Hone the cylinders using the following equipment, materials and methods:
   • Use only a rigid hone.
   • Honing stones: GC-600-J or finer stones for nonferrous metals
   • Pressure: 200-300 kPa (2-3 kgf/cm² , 28-43 psi)
   • Honing RPM: 45-50
   • Honing thickness: Less than 0.02 mm (0.0008 in.) Do not hone more than 20 cycles.
   • Honing lubricant: Oil type
   • Honing pattern: 60 degree cross-hatch (A)
   • Hone cleaning: Clean the stones every five cycles.
     Fig 1: Identifying Cylinder Head Honing Pattern (60 Degree Cross-Hatch)

     Courtesy of AMERICAN HONDA MOTOR CO., INC.
3. When honing is complete, thoroughly clean the engine block of all metal particles. Wash the cylinder bores with hot soapy water, then dry and oil them immediately to prevent rusting. Never use solvent, it will only redistribute the grit on the cylinder walls.
4. If scoring or scratches are still present in the cylinder bores after honing to the service limit, rebore the cylinders. Some light vertical scoring and scratching is acceptable if it is not deep enough to catch your fingernail and if it does not run the full length of the bore.