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YO-233-B2A Engine Maintenance Manual
TEO-540-A1A Engine Maintenance Manual
Problem
Poor idle cut-off
Rough Idle
© 2021 Avco Corporation. All Rights Reserved
February 2021
Table 1 (Cont.)
Fault Isolation Guide
Cause
Incorrect rigging of mixture
control linkage
Mixture control valve is scored
or not seating properly or O-
ring on mixture jet is broken or
deformed
Leaky valve
Incorrect idle mixture
Found only as follows:
—High ambient temperatures
—Engine operating for a long
time at low or idle rpm
Leak in induction system
Corrective Action
Adjust in accordance with
airframe manufacturer's
instructions.
Send carburetor to the
manufacturer or repair center
for inspection or repair.
1. Adjust the idler mixture
per instructions in the
section "Idle Speed
Mixture Adjustment" in
Chapter 72-00.
2. Readjust idler speed
1. Operate with cowl flaps in
the full open position.
2. Keep ground operation to a
minimum.
3. Operate with boost pump
on as necessary.
4. Complete the check of the
vent return line for
blockage. Clean if
necessary.
1. Examine the flanges,
gaskets and O-rings for
leaks. Tighten or replace as
necessary.
2. Examine for cracked intake
pipes. Replace as
necessary.
3. Examine for loose flange
bolts or loose plugs in
intake port of cylinders.
Torque as required.
4. Examine for fuel stain
evidence of leaking
gaskets. Replace when
found.
5. Examine for fuel drain
valve not properly seating.
Ref.
72-00
OHM
12-30
Page 75
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