- Place a new valve in the valve guide.
- Place a dial indicator with a magnetic base on the face of the cylinder head.
- Lift the edge of the valve head to a distance of
15.0 mm (0.60 inch) . - Move the valve in a radial direction away from the dial indicator. Make sure that the valve moves away from the dial indicator as far as possible. Position the contact point of the dial indicator on the edge of the valve head. Set the position of the needle of the dial indicator to zero.
- Move the valve in a radial direction toward the dial indicator as far as possible. Note the distance of movement which is indicated on the dial indicator. If the distance is greater than the maximum clearance of the valve in the valve guide, replace the valve guide.
The maximum clearance for the inlet valve stem in the valve guide with a valve lift of
15.0 mm (0.60 inch) is the following value. ...0.100 mm (0.0039 inch) The maximum clearance for the exhaust valve stem in the valve guide with a valve lift of
15.0 mm (0.60 inch) is the following value. ...0.121 mm (0.0048 inch)
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| Illustration 1 | g00314806 |
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Measure the radial movement of the valve in the valve guide. (1) Valve guide (2) Radial movement of the valve in the valve guide (3) Valve stem (4) Dial indicator (5) Valve head | |
When new valve guides are installed, new valves and new valve seat inserts must be installed. Valve guides and valve seat inserts are supplied as an unfinished part. The unfinished valve guides and unfinished valve seat inserts are installed in the cylinder head. Then, the valve guides and valve inserts are cut and reamed in one operation with special tooling.
Refer to Disassembly and Assembly, "Inlet and Exhaust Valve Guides - Remove and install" for the replacement of the valve guides.