MOONEY AVIATION COMPANY, INC.
M20TN SERVICE & MAINTENANCE MANUAL
Page
Date
15
2006
Rev Date
NOTE:
If excessive oil is found, compressor should be
checked for leaks. Use fluid or leak detector as
required. If leak is found, compressor should be
replaced. If compressor has not been operated
for 30--60 days or more, the dynamic shaft seal
may have a small leak due to lack of oil on seal
surface. Operation of system should eliminate
this type of leak. If not, replace compressor.
7. Check all fasteners for looseness. Re--torque as
required.
8. Visually inspect drive belt for cracks, wear and ex-
cessive oil.
9. Clean all oil and other contaminates from belt with
clean shop rag.
NOTE:
Checking compressor oil quantity is required
only if an excessive amount of oil is observed
due to leaks or system has been vented very
quickly, thereby causing a loss of oil. An oil
check can be made only when system is vented.
See Oil Check Procedure, Section 21--55--05.
10. If visual check is good, replace any removed
components and secure all fasteners.
21--55--03 -- COMPRESSOR REMOVAL
1. Verify aircraft power is OFF.
2. Remove cowling to gain access to rear of engine
and compressor.
3. Connect refrigerant manifold gauge and hose as-
semblies to system service ports.
4. Recover system refrigerant charge per recovery
equipment manufacturers operating manual.
5. Loosen belt tension. See Section 21--54--04, for
reverse procedure.
6. Disconnect clutch wiring.
7. Loosen compressor mounting bolts.
8. Remove belt guard assembly per Section
21--54--01, 3.
9. Remove belt from all three pulleys per Section
21--54--01.
10. Remove system suction and discharge hose
connections and cap them off immediately.
-- WARNING --
All systems connections must be capped to pre-
vent water, dust or other contaminates from en-
tering system.
11. Remove compressor mounting hardware and lift
compressor from mounting bracket.
21--55--04 -- COMPRESSOR REPLACEMENT
If a new or rebuilt compressor is supplied without suc-
tion and discharge swivel fittings or pulley, these parts
must be removed from the failed compressor and
installed on the new compressor. It is recommended
that a complete, new, compressor assembly be
installed.
NOTE:
If failed compressor has contaminated system, a
complete cleaning of system is required. Also,
the receiver--dryer assembly must be replaced.
Flush system with an approved flush agent and
purge with dry nitrogen. Also, remove and clean
expansion valves.
1. Lift compressor into support bracket and install
mounting hardware.
2. Install either new or inspected and cleaned old belt
on to all three pulleys per Section 21--54--02.
3. Tighten mounting hardware (temporarily).
4. Verify alignment of belt on all pulleys and align per
Section 21--54--03, if required.
5. Loosen compressor mounting nuts (2 each); pull
bolts out enough to install belt guard per Section
21--54--02.
6. Connect clutch wiring.
7. Tighten belt guard/compressor mounting hard-
ware per Section 25--54--02, 4.
-- CAUTION --
New compressor is supplied with 10 PSIG ni-
trogen pressure. Remove caps and vent slowly.
8. Remove compressor suction and discharge fitting
caps and connect system hoses.
NOTE:
Lightly apply R--134a refrigerant oil (RL--100S) on
fitting o--ring and at contact surface between
tube bead and jam nut. Apply a small amount of
thread sealant to male fitting threads (stay clear
of first 2--3 threads).
9. Tighten o--ring fitting nuts to 150--200 in. lbs.
-- CAUTION --
DO NOT OVERTORQUE
10. Connect R--134a service gauges to unit suction
and discharge service ports.
11. Leak check system per Section 21--51--00 as re-
quired.
12. Charge system per Section 21--52--00 as re-
quired.
13. Operate system to verify compressor operation
and system performance.
21--55--03
AUGUST 2010
Summary of Contents for M20TN
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