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(6) Remove the cylinder from the Cylinder Block.
NOTICE: Use care not to scratch the inside of the cylinder barrel when removing the
exhaust valve.
(7) Remove the exhaust valve from the valve guide, through the cylinder barrel.
B. Exhaust Valve Installation
NOTICE: Use care not to scratch the inside of the cylinder barrel when installing the exhaust
valve.
(1) Apply a coating of Castrol
other lubricant identified in the latest revision of Service Instruction No. SI-1059.)
(2) Install a serviceable exhaust 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.
(5) Use a Valve Spring Compressor Tool (ST-25) to compress the exhaust valve springs and
install the exhaust valve keys.
(6) Install the exhaust valve stem cap (Figure 24) on the exhaust valve.
(7) Remove the cylinder from the Cylinder Block and install the cylinder on the engine per
the "Cylinder Installation" procedure in this chapter.
20. Cylinder Installation
NOTICE: Before cylinder installation, make sure that the connecting rod bushing was examined
per the "Connecting Rod Inspection Checklist for YO-233-B2A Engines" in Chapter
72-20.
Use a cylinder kit when installing a new cylinder. When installing a removed cylinder
be sure you are installing the correct cylinder in the designated position on the engine.
If all cylinders are to be installed, install them by their firing order 1-3-2-4.
CAUTION INSTALL ONLY THE NEW CYLINDER BASE OIL SEAL RING (FIGURE 17)
AROUND THE CYLINDER BASE. DO NOT USE ANY ADDITIONAL
SEALANT OR GASKET MATERIAL WHICH COULD DETERIORATE AND
CAUSE A REDUCED TORQUE ON THE CYLINDER BASE STUDS.
NOTICE: Do not re-install the cylinder base oil seal ring which had been removed during cylinder
removal. Use a new cylinder base oil seal ring.
A. Apply a light coat of engine oil mixture to the cylinder base oil seal ring.
B. Install a new cylinder base oil seal ring around the cylinder base over the pilot diameter on
each engine cylinder.
C. Lubricate the inside diameter of the cylinder barrel with engine oil mixture (15% pre-
lubricant (STP or equivalent) and 85% SAE No. 50 mineral base aviation grade lubricating
oil) to the depth of the piston rings, approximately 2 in. (5 cm).
72-30
Page 134
YO-233-B2A Engine Maintenance Manual
TEO-540-A1A Engine Maintenance Manual
®
Contractor Special NLGI#1 to the exhaust valve stem (or
© 2021 Avco Corporation. All Rights Reserved
February 2021
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