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YO-233-B2A Engine Maintenance Manual
TEO-540-A1A Engine Maintenance Manual
(20) Install the Gage Adapter (ST-71-8) over the top of the exhaust valve stem (Figure 7).
Make sure it is tight.
NOTICE: If you can move the Gage Adapter (ST-71-8) on the exhaust valve stem with
your hand, it is incorrectly installed.
(21) Push the exhaust valve stem and Gage Adapter (ST-71-8), against the upper exhaust
valve spring seat as far as they will go.
(22) Put the blade of a screwdriver in the area between the exhaust valve spring and Gage
(ST-71).
(23) Use the screwdriver to push the valve the maximum distance away from the dial
indicator as shown in Figure 8.
(24) Move the dial indicator toward the adapter post until the indicator is preloaded
approximately 0.010 in. (0.254 mm), and lock it in place with the set screw (Figure 8).
(25) Adjust the dial of the indicator to read "0" (zero) as shown in Figure 8.
Figure 8
Dial Indicator
© 2021 Avco Corporation. All Rights Reserved
February 2021
Gage Adapter (ST-71-8) Assembled on Exhaust Valve
Figure 7
Pushing Valve Stem and Adapter Post
Toward Dial Indicator
Figure 9
Page 107
72-30
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