Exhaust Valve Replacement - Lycoming TEO-540-C1A Maintenance Manual

TEO-540-C1A Engine Maintenance Manual
TEO-540-C1A Engine Maintenance Manual

14. Exhaust Valve Replacement

A. Exhaust Valve Removal
(1) Remove the cylinder from the engine per the "Cylinder Removal" procedure in this
chapter.
(2) Remove the rotator valve stem cap (Figure 27).
(3) Use a Valve Spring Compressor Tool (ST-25) to compress the exhaust valve spring and
remove the valve stem key.
(4) Remove the valve spring seats and valve springs from the exhaust valve.
NOTICE: Use care not to scratch the inside of the cylinder barrel when removing the
exhaust valve.
(5) 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 lubricant identified in the latest revision of Service Instruction No. SI-1059 to the
exhaust valve stem.
(2) Install a serviceable exhaust valve in the valve guide (Figure 27), through the cylinder
barrel.
(3) Install the valve spring seats and valve springs,
(4) Use a Valve Spring Compressor Tool (ST-25) to compress the exhaust valve spring and
install the valve stem key.
(5) Install the rotator valve stem cap on the exhaust valve.
(6) Install the cylinder on the engine per the "Cylinder Installation" procedure in this chapter.
15. Cylinder Installation
NOTICE: If all cylinders are to be installed, install them by their firing order 1-4-5-2-3-6 (Figure
14).
CAUTION INSTALL ONLY THE NEW CYLINDER BASE OIL SEAL RING AROUND
THE CYLINDER BASE. DO NOT APPLY ANY SEALANT OR GASKET
MATERIAL WHICH COULD DETERIORATE AND CAUSE A REDUCED
TORQUE ON THE CYLINDER BASE STUDS.
A. Apply a light coat of engine oil mixture to a new cylinder base oil seal ring. (Do not re-install
a used cylinder base oil seal ring.)
B. Install a new cylinder base oil ring (Figure 15) around the cylinder base.
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).
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November 2018
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