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Engine Block
Cylinder Honing
Only a scored or scratched cylinder bore must be honed.
1. Measure the cylinder bores (see page 7-22).
If the block is to be reused, hone the cylinders and
remeasure the bores.
2. Hone the cylinder bores w i t h honing oil and a fine
(400 grit) stone in a 60 degree cross-hatch pattern
(A). Use only a rigid hone w i t h 400 grit or finer
stone such as Sunnen, A m m c o , or equivalent. Do
not use stones that are w o r n or broken.
3. W h e n honing is complete, t h o r o u g h l y clean the
engine block of all metal particles. Wash the
cylinder bores w i t h hot soapy water, then dry and
oil t h e m 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 cylinder block. 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.
7-24
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Troubleshooting
