Cylinder Block

Inspection

•   If measurements in any cylinder are beyond Oversize Bore Service Limit, replace the block.

•   If block is to be rebored, refer to Piston Clearance Inspection (page 7-10) after reboring.
NOTE: Scored or scratched cylinder bores must be honed.
Reboring Limit: 0.50 mm (0.020 in)

2. Check the top of the 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)

Bore Honing

1. Measure cylinder bores as shown on page 7-12. If the block is to be re-used, 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 engine 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 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.