If you do not have the necessary tools at hand or do not want to do the honing yourself, the work can be entrusted to specialists at a car service workshop for a very reasonable fee.
2. Before you start honing, replace the main bearing covers/connecting bridge (without inserts) and tighten the mounting bolts to the required torque.
3. There are two types of hones for processing cylinder mirrors: a bottle brush type hone and a more traditional surface hone in the form of an attachment with spring-loaded sharpening stones. Both tools provide the necessary quality of processing of cylinder mirrors, although the use of the first is preferable for an inexperienced mechanic. You will also need a sufficient amount of rags, special honing or simply liquid machine oil, and an electric drill as a drive for the honing attachments. Proceed in the following order:
- Clamp the hone into the chuck of the electric drill, bring the spring-loaded sharpening stones/rods of the brush attachment together and insert the latter into the cylinder.
Don't forget to wear safety glasses or a face shield!
- Generously wet the mirror of the cylinder being processed with oil, turn on the drill and begin to make reciprocating movements with the attachment inside the cylinder. The speed of the vertical movement of the hone should ensure that a mesh pattern is applied to the surface of the cylinder mirror with an intersection angle of the sides of the mesh of about 60°. Do not skimp on oil and try not to remove more material from the surface of the cylinder walls than is really necessary to achieve the desired result.
Piston ring manufacturers may have their own requirements for the angle of intersection of the mesh pattern sides - carefully read the instructions on the repair kit packaging.
- Do not remove the hone from the cylinder until the drill has stopped completely! Continue to move the hone back and forth until it stops rotating. Once the drill has stopped, squeeze the sharpening stones together and remove the hone from the cylinder. When using a bottle brush hone, wait until the drill has stopped completely, then remove the hone while continuing to manually rotate the chuck in the normal direction.
- Wipe the cylinder bore with a rag and move on to honing the next one.
For an inexperienced amateur mechanic, it would be wiser to use a simpler to operate "bottle brush" type hone
As a result of honing, a grid-like pattern with an intersection angle of cells of about 60° should form on the cylinder walls
4. Once the treatment is complete, use a file to remove the chamfers from the upper edges of the cylinders - this treatment is performed in order to avoid difficulties when loading the pistons with the rings on them into the cylinders. Be extremely careful - do not scratch the cylinder bore with the file.
5. Finally, the entire unit should be thoroughly washed with a warm, soapy water solution.
The cylinders can be considered washed when, after passing an oil-soaked white rag over the mirror, no gray film remains on it. Do not forget to clean all oil holes and channels with a cylindrical brush, then wash the block with a stream of water under pressure.
6. After washing, dry the block thoroughly and lubricate the machined surfaces with oil to protect them from corrosion. Before assembling the engine, wrap the block in a clean plastic bag.
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