As illustrated below, use a commercially available air-impact valve guide driver (A) modified to fit the diameter of the valve guides. In most cases, the same procedure can be done using the special tool and a conventional hammer.
Select the proper replacement guides, and chill them in the freezer section of a refrigerator for about an hour.
Use a hot plate or oven to evenly heat the cylinder head to 150°C (300°F). Monitor the temperature with a cooking thermometer. Do not get the head hotter than 150°C (300°F); excessive heat may loosen the valve seats.
Working from the camshaft side, use the driver and an air hammer to drive the guide about 2 mm (0.1 in.) towards the combustion chamber. This will knock off some of the carbon and make removal easier. Hold the air hammer directly in line with the valve guide to prevent damaging the driver.
Turn the head over, and drive the guide out toward the camshaft side of the head.
If a valve guide won't move, drill it out with a 8 mm (5/16 inch) bit, then try again. Drill guides only in extreme cases; you could damage the cylinder head if the guide breaks.
Remove the new guide(s) from the freezer, one at a time, as you need them.
Apply a thin coat of clean engine oil to the outside of the new valve guide. Install the guide from the camshaft side of the head; use the special tool to drive the guide in to the specified installed height (A) of the guide (B). If you have all 8 guides to do, you may have to reheat the head.
Valve Guide Installed Height:
15.85-16.35 mm (0.624-0.644 in.)
Coat both reamer and valve guide with cutting oil.
Rotate the reamer clockwise the full length of the valve guide bore.
Continue to rotate the reamer clockwise while removing it from the bore.
Thoroughly wash the guide in detergent and water to remove any cutting residue.