Cylinder Bore Honing

Cylinder Bore Honing





Material

Service
1. The most desired cylinder block cleaning method is the "hot tank" method. All gallery plugs must be removed prior to hot tanking the cylinder block. If a hot tank is not available, soap and water is the approved alternative cleaning method.
2. Remove the gallery plugs.
- Remove the tappet oil gallery plugs.
- Remove the main oil gallery plug.

3. CAUTION: Do not exceed 25 strokes per cylinder bore. Excessive honing will remove too much material from the cylinder wall.

Continuously spray the cylinder wall with Penetrant and Lock Lubricant XL-1 or equivalent, while honing.





4. CAUTION: Remove the piston cooling oil jets prior to honing the cylinders. Failure to do so will cause damage to the piston cooling oil jets.

CAUTION: Always remove the hone from the cylinders while the hone is still rotating. Failure to do so may cause an inconsistent pattern to form allowing excess engine oil to enter the combustion chamber.

NOTE: It is not necessary to remove the crankshaft to hone the cylinder block. However, it is recommended to oil the crankshaft journals, then wrap them with clean shop towels and tape.

NOTE: An air or electric drill motor with an adjustable speed down to 100 rpm is required to hone the cylinders. If a drill motor meeting this requirement is not available, cylinder honing cannot be carried out.

NOTE: A four-inch deglazing hone is required to hone the cylinders of this diesel engine.

Insert the hone into a cylinder and begin honing for three seconds at a cycle of two strokes per second. Remove the hone from the cylinder.





5. Wipe a section of the cylinder wall and inspect the crosshatch pattern, comparing it to the neighboring (untouched) cylinder.

6. CAUTION: Continuously spray the cylinder wall with Penetrant and Lock Lubricant XL-1 or equivalent. Do not exceed 25 strokes per cylinder bore. Excessive honing will remove too much material from the cylinder wall.

Repeat the honing process until the cylinder wall has a satin-like finish, or the maximum 25 strokes are achieved.

7. CAUTION: If the following steps are not followed, the cylinder bore(s) can rust.

Clean and preserve the cylinder bores.
- Clean the cylinder bores using a mild soap and water.
- Dry the cylinder bores thoroughly using a clean, lint-free cloth.
- Soak a clean cloth in clean engine oil and wipe the cylinder bores with the cloth.
- Drape a clean cloth over the cylinder block to keep contaminants out of the cylinder bores.

Inspection

1. CAUTION: There is no authorized repair for cracks in the cylinder block. If cracks are present, install a new cylinder block.

NOTE: Do not substitute rubbing alcohol for wood alcohol.

Inspect the cylinder block for cracks not visible to the eye.
- Coat the suspected area with a mixture of 25 percent kerosene and 75 percent light engine oil.
- Wipe the area dry, and immediately apply a coating of zinc oxide dissolved in wood alcohol. If cracks are present, the coating will become discolored at the damaged area.