2. Before honing the cylinders, install the main bearing caps and tighten the bolts to the torques given in "Technical data" at the beginning of the chapter.
3. There are two types of cylinder hones commonly used - a glass bead ("bottle brush") hone or a traditional surface hone with abrasive bars on springs. You will also need some honing oil (if there is no special oil, kerosene will do), rags and an electric drill. Proceed as follows.
- a) Install the hone in an electric drill, compress the bars and insert it into the first cylinder (see illustration). Be sure to wear protective glasses or a mask.
- b) Lubricate the cylinder with a generous amount of honing oil, turn on the drill and move the hone up and down the cylinder at a speed that will produce the desired crosshatch pattern on the cylinder walls. Ideally, the hatching lines should intersect at a 45° angle (see illustration). Be sure to apply plenty of oil and select more surface material than is required to achieve the desired wall condition.
Note: Piston ring manufacturers may specify different crosshatch angles. Follow the instructions included with your new rings.
- c) Do not remove the moving hone from the cylinder. Turn off the drill and continue to move the hone up and down the cylinder until it stops completely, then squeeze the hone and remove it. If you are using a bottle brush type hone, turn off the drill and, while rotating the drill chuck in the direction of normal rotation, remove the hone from the cylinder.
- d) Remove oil from the cylinder walls and repeat the procedure for the remaining cylinders.
17.3a. If you have never honed cylinders before, it is preferable to use a "bottle brush" type hon |
17.3b. The hone for the cylinder should leave a smooth net-like hatching, the lines in which intersect at an angle of approximately 90° |
4. After completing the honing procedure, file the top edges of the cylinders with a fine-grain file to prevent the pistons from sticking during installation. Be careful not to scratch the cylinder walls with the end of the file.
5. The cylinder block must then be thoroughly washed again with warm soapy water to remove all traces of abrasive dust created during honing.
Note: Cylinders can be considered clean if, after wiping the walls with a white, lint-free cloth soaked in clean motor oil, no honing residue collects on the cloth, which appears as gray spots. Don't forget to brush out all oil holes and lines and rinse them with running water.
6. After washing, dry the block and cover all treated surfaces with light anti-corrosion oil. Place a plastic film over the block to keep it clean until assembly begins.