Valve Guide Replacement
WARNING: This page is about a different car, the 2007 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
- Select the proper replacement guides and chill them in a freezer for approximately 1 hour.
- Use a hot plate or an oven to evenly heat the cylinder head to 150°C (300°F). Monitor the temperature with a thermometer.
- Working from the camshaft, or top, side, use the EN 46341 and an air hammer in order to drive the guide approximately 2 mm (0. See Special Tools .1 in) towards the combustion chamber. This action will remove some of the carbon from the guide and ease in guide removal.
- Turn the head over and use the EN 46341 and an air hammer to drive the guide out of the cylinder head. See Special Tools . If the valve guide will not move, enlarge the guide bore with an 8 mm (5/16 in) drill bit.
- Use the EN 46341 in order to install the NEW guides into the cylinder head. See Special Tools . Remove the valve guides, 1 at a time from the freezer, just prior to installation.
- Measure the guide (264) for the properly installed height (a).
Specification:
- Intake valve guide installed height: 21.20-22.2 mm (0.835-0.874 in)
- Exhaust valve guide installed height: 20.63-21.63 mm (0.812-0.852 in)
- Coat the EN 46345 and the valve guide with cutting oil. See Special Tools .
- Use the EN 46345 to ream the guide to the proper size. See Special Tools . Rotate the reamer clockwise the full length of the guide bore. Continue to rotate the reamer clockwise while removing from the guide bore.
- Clean the guide in detergent and water to remove cutting residue.
- Measure the valve stem-to-guide clearance. The valve should slide freely in the guide without exerting pressure.
IMPORTANT:
Do not heat the cylinder head in excess of 150°C (300°F). Excessive heating of the cylinder head may loosen the valve seats.
IMPORTANT:
Drill the guides only in extreme cases. Use extreme care not to break the guide and damage the cylinder head.