Valve Guides

Replacement

1. As illustrated in the removal steps of this procedure use a commercially-available air-impact driver attachment which may need to be modified to fit the diameter of the valve guides. In most cases, the same procedure can be done using Valve Guide Drivers and a conventional hammer. Tool numbers are included in the procedure.
2. Select the proper replacement guides and chill them in the freezer section of a refrigerator for about an hour.

3. Use a hot plate or oven to evenly heat the cylinder head to 150°C (300°F). Monitor the temperature with a cooking thermometer.

4. Working from the camshaft side, use the driver and an air hammer to drive the guide about 2 mm towards the combustion chamber. This will knock off some of the carbon and make removal easier.
CAUTION:
•   Always wear safety goggles or a face shield when using the air hammer.
•   Hold the air hammer directly in line with the valve guide to prevent damaging the driver.

5. Turn the head over and drive the guide out toward the camshaft side of head.

If a valve guide still won't move, drill it out with a 5/16 inch bit, then try again.

CAUTION: Drill guides only in extreme cases; you could damage the cylinder head if the guide breaks.

6. Remove the new guides from the refrigerator, one at a time, as you need them.

CAUTION:
•   Do not use a torch; it may warp the head.
•   Do not get the head hotter than 150°C (300°F); excessive heat may loosen the valve seats.
•   To avoid burns, use heavy gloves when handling the heated cylinder head.