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YO-233-B2A Engine Maintenance Manual
TEO-540-A1A Engine Maintenance Manual
18. Intake Valve Replacement
A. Intake Valve Removal
(1) Remove the cylinder from the engine per the "Cylinder Removal" procedure in this
chapter.
(2) Put the cylinder on a Cylinder Block P/N 64526-2 or equivalent.
(3) Compress the intake valve springs with a Valve Spring Compressor Tool (ST-25) and
remove the intake valve keys.
(4) Remove the valve spring seats and valve springs from the intake valve (Figure 15).
(5) Remove the cylinder from the Cylinder Block.
NOTICE: Use care not to scratch the inside of the cylinder barrel when removing the
intake valve.
(6) Remove the intake valve from the valve guide, through the cylinder barrel.
B. Intake Valve Installation
NOTICE: Use care not to scratch the inside of the cylinder barrel when installing the intake
valve (Figure 15).
(1) Apply a coating of Castrol
lubricant identified in the latest revision of Service Instruction No. SI-1059.)
(2) Install a serviceable intake valve in the valve guide (Figure 15), through the cylinder
barrel.
(3) Put the cylinder on a Cylinder Block P/N 64526-2 or equivalent.
(4) Install the valve spring seats and valve springs (Figure 15).
(5) Compress the intake valve springs with a Valve Spring Compressor Tool (ST-25) and
install the intake valve keys.
(6) Remove the cylinder from the Cylinder Block and install the cylinder on the engine per
the "Cylinder Installation" procedure in this chapter.
19. Exhaust Valve Replacement
A. Exhaust Valve Removal
(1) Remove the cylinder from the engine per the
"Cylinder Removal" procedure in this chapter.
(2) Put the cylinder on a Cylinder Block P/N 64526-
2 or equivalent.
(3) Remove the exhaust valve stem cap (Figure 36)
from the exhaust valve.
(4) Compress the exhaust valve springs (Figure 15)
with a Valve Spring Compressor Tool (ST-25)
and remove the exhaust valve keys.
(5) Remove the valve spring seats and valve springs
from the exhaust valve.
© 2021 Avco Corporation. All Rights Reserved
February 2021
®
Contractor Special NLGI#1 to the intake valve stem (or other
Figure 36
Exhaust Valve Stem Cap
72-30
Page 133
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