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8
Remove the Opening shim (6) from the valve stem.
Measure
NOTE: The Opening Shim has a Flat side and a recessed side. Using light pressure,
close the dial caliper all the way and “zero” the unit: hold the On/Off/Set button
until all Zeros appear in the display.
Open the Caliper sufficiently to allow the Opening
Shim to fit between the jaws of the micrometer.
The flat side of the Opening Shim should rest
against the stationary jaw of the micrometer. The
moveable portion of the micrometer will fit inside
the recessed portion of the opening shim.
Record
Record the measurements in Appendix 1.
Closing Shim Removal and Measurement
If the closing shim needs replacement, remove the opening shim as described in the
previous section. The valve stem is exposed with the opening rocker slid to the side.
Place a clamp on the valve. In addition to having the
cylinder at TDC, this is a little extra insurance to keep the
valve from dropping into the cylinder.
Press down on the Closing rocker to expose the retaining
rings. Slight engine rotation may be required to get the
rocker to move far enough to expose the retaining rings. The
retaining rings are in two halves.
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