Fuel Drain Valve Adapter Assembly Inspection - Lycoming TEO-540-C1A Maintenance Manual

TEO-540-C1A Engine Maintenance Manual

3. Fuel Drain Valve Adapter Assembly Inspection

The fuel drain valve adapter (Figure 3) is a valve in the induction system that closes during
engine operation and opens when the engine is shut down to allow excess fuel to drain from the
induction system. If the valve is not operating correctly it can either allow outside air into the
induction system during engine operation or fail to drain excess fuel from the induction system
when the engine is shut down.
If your engine has a fuel drain valve adapter, examine the assembly as follows:
A. Remove the fuel drain valve adapter assembly from the induction housing (Figure 3).
B. Examine the fuel drain valve adapter for damage.
C. Make sure the fuel drain valve adapter is operating correctly:
(1) The valve is operating correctly if it is open with no air pressure applied.
(2) The valve is operating correctly if it closes when 0.75 to 1.0 psi (5.2 to 6.9 kPa) of air
pressure is applied to the inboard side of the fuel drain valve adapter assembly, then
repeated with the outboard side.
D. If the valve is not operating correctly or if it is damaged, replace the fuel drain valve adapter
assembly.
E. Install a serviceable fuel drain valve adapter in the induction housing. Torque the fuel drain
valve adapter to 40 in.-lb. (4.5 Nm).
4. Induction Housing Replacement
A. Induction Housing Removal
(1) Remove the 10 bolts, 20 washers, 10 lock washers, and nuts from the induction housing
and oil sump (Figure 3). Discard the lock washers.
(2) Remove the four bolts and washers from the induction housing.
(3) Remove the induction housing.
© 2018 Avco Corporation. All Rights Reserved
November 2018
Figure 3
Induction Housing
72-80
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