Author Topic: How To Hone a Liner  (Read 2192 times)


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How To Hone a Liner
« on: 16:16, Mon 21 December 2009 »
How to Hone a cylinder liner

Tools required

Drill with Adjustable speed control,
Honing tool,
Plenty of 2- weight motor oil to lubricate the liner whilst honing,
Anti-rust protective oil,
Fairy liquid,
Bucket of hot water

1. Set the liner in a vice or adjustable workbench so it is gripped nice and firm.

2. Set the honing tool in a drill with a slow speed setting.  You may use a brush hone if the condition of the liner walls is fairly good and they just need deglazing.  Use a flex (stone) hone if the cylinder is worn but not excessively; use a rigid (stone) hone if the cylinders are excessively worn but still within manufacturer specifications.

3. Mix equal amounts of 20-weight Motor oil and kerosene in a clean plastic container and uses the mixture to lubricate the cylinder walls.  Put on your safety goggles.

4. Turn on the drill and keep the hone moving up and down within the liner at all times, at a pace slow enough to produce a crosshatch pattern of about 50 to 60 degrees on the liner walls.  Keep the cylinder wall well lubricated.  When you are finished, shut off the drill, but keep the hone moving until the drill stops. Compress the brush or stones and pull the hone out of the cylinder.  Repeat this process for all liners until you are finished.

5. Chamfer the top edge of the cylinder walls with a small file so the pistons will not seize during installation. Thoroughly wash the liner with soap and warm water, to get rid of the grit produced during honing. Dampen a white cloth with new motor oil and wipe the cylinder walls. If the cloth picks up gray residue from the liner wall, wash the liner again.

6. Rinse the liner with clean water.  Dry the liner and lubricate the liners with anti-rust protective oil.  Cover the liners with a plastic bag to keep dust off.

Tips & Warnings
If you do not know if the liners are within manufacturer specifications, I would suggest you take the liner to a local a garage or machine shop for inspection.  If the liners are excessively worn, the machine shop may bore the liners for you, this will obviously require oversized pistons and rings to be fitted but the machine shop will tell you the required sizes.  Could be cheaper just to buy new standard size liners.