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YO-233-B2A Engine Maintenance Manual
TEO-540-A1A Engine Maintenance Manual
(4) Turn the crankshaft to position the piston at Top Dead Center (TDC) of the compression
stroke.
(5) Remove the screws, rocker box cover (Figure 1) and gasket from the cylinder head.
Discard the gasket.
(6) Remove the thrust button from the exhaust side of the valve rocker shaft (Figure 5) and
push the valve rocker shaft toward the intake side enough to remove the exhaust rocker
assembly.
(7) Remove the exhaust rocker assembly.
(8) Remove the valve stem cap from the exhaust valve.
(9) Turn the crankshaft to position the piston at the bottom of the compression stroke.
(10) Insert about 8 ft. (2.4 m) of 3/8-inch nylon rope through the spark plug hole; turn the
crankshaft until the piston moves the rope snuggly against the exhaust valve.
(11) Use a Valve Spring Compressor (ST-25) to compress the exhaust valve springs and
remove the exhaust valve key. (The rope inserted in the combustion chamber in the
preceding step provides a base to support the valve.)
© 2021 Avco Corporation. All Rights Reserved
February 2021
Figure 5
YO-233-B2A Engine Valve Components
72-30
Page 105
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