Mooney M20TN, Service And Maintenance Manual

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MOONEY AVIATION COMPANY, INC.
M20TN SERVICE & MAINTENANCE MANUAL
Date
2006
Rev Date
Page 10
Recheck idle mixture to insure it is within specified lim-
its. Recheck idle pressure. Also refer to TCM Service
Information Directive SID97--3(E) or latest FAA ap-
proved revision
NOTE:
Lightly tap fuel metering valve after each
adjustment.
NOTE:
Any readjustment to idle pressure or mixture
may cause change to other readings. Recheck all
specified readings.
4. FULL POWER PERFORMANCE
Check and adjust full power performance as follows:
A. Adjust fuel flow to 177--180 LBS/HR mixture
control in full rich position. (Fig. 71--3, 5). Unmetered
Pump to 20--23.0 PSI, Metered Nozzle to 10.4--11.6
PSI, Fuel to 30.0--30.7 GAL/HR with throttle set at full
power (2500 rpm). Also refer to TCM Service Informa-
tion Directive SID97--3(E) or latest revision.
NOTE:
Mixture and propeller controls must be full
forward.
NOTE:
Lightly tap fuel pump after each adjustment.
NOTE:
The Best Power setting will develop the
maximum horsepower and speed for a particular
manifold pressure and rpm setting. Best Power
mixture is desirable for minimizing flight time
when fuel burn rate or range is not a primary
concern. When TIT limitations prevent attaining
peak TIT then best power is obtained at 1650
°
F
TIT.
B. Recheck idle pressure setting as specified in 2
above and adjust as required.
C. Recheck 100 percent power fuel flow as speci-
fied in 5. A. and adjust as required.
-- CAUTION --
Do not exceed 2500 RPM under any circum-
stances during the full power adjustment
process.
5. IDLE SPEED
Check and adjust idle speed as follows:
A. Operate engine at 1500 to 1800 RPM until CHT
(maintain CHT during adjustment) is in GREEN BAND
and oil temperature is 160
°
to 180
°
F. Also refer to TCM
Service Information Directive SID97--3(E) or latest revi-
sion.
B. Reduce engine speed and stabilize at 750 RPM.
C. Adjust idle speed adjusting screw (Fig. 73--3,
item 3) until contact is made with throttle arm stop.
NOTE:
Fuel flow will vary with temperature changes.
Temperature variations from NACA STANDARD
DAY temperature causes approximately .7 lbs/hr.
fuel flow change with each 1
°
C. variation (minus
if hotter, plus if colder).
If RPM changes appreciably after making idle mixture
adjustment during the succeeding steps, readjust as
necessary.
AUGUST 2010
71--00--50