2. As shown in the figure below, use a commercially available pneumatic hammer-driven guide rod for fitting valve bushings A, modified to fit the diameter of the valve bushings. In most cases, the same procedure can be performed using a special device and a conventional hammer.
3. Select repair bushings of the required sizes and cool them in the freezer of a household refrigerator for about one hour.
4. Use a hotplate or oven to heat the cylinder head evenly to 150°C. Monitor the temperature with a kitchen thermometer. Do not heat the cylinder head more than 150°C; excessive heat may cause the valve seats to loosen.
5. From the camshaft side, use a guide rod and a nail gun to push the valve guide approximately 2 mm () towards the combustion chamber. This will knock out some of the carbon deposits and make removal easier. Keep the nail gun in line with the valve guide to avoid breaking the guide rod. Wear safety glasses or use a shield.
6. Turn the head over and pull the guide rod outward, in the direction of the cylinder head camshaft.
7. If the valve guide does not move, drill it out with an 8mm drill bit and try again.
Note: Drill out valve guides only as a last resort; you can damage the cylinder head if the valve guide breaks.
8. Remove new bushing(s) from freezer one at a time as needed for installation.
9. Apply a thin coat of clean engine oil to the outside surface of the new valve guide. Install the valve guides from the camshaft side of the cylinder head; use the valve guide sleeve fitting tool to set the guide rod to the specified height A of the valve guide sleeve B. If you need to install all 8 valve guide bushings, you may need to reheat the cylinder head.
Valve guide installation height: 15.85-16.35 mm.
10. Lubricate the surfaces of the reamer and valve guide bushing with cutting fluid.
11. Rotate the reamer clockwise until it reaches the full length of the valve guide bore.
 |
 |
12. Continue rotating the reamer clockwise as you remove it from the hole.
13. Thoroughly wash the valve guide with solvent and water to remove any chips left from reaming.
14. Check the clearances between the bushing and the valve. Make sure that the valves slide in the intake and exhaust valve guides without sticking.
The text can be found on the website www.hondabook.ru