MOONEY INTERNATIONAL CORPORATION
M20V SERVICE AND MAINTENANCE MANUAL
Page
Date
15
MAR 2017
Rev Date
9. After five (5) hours of operation, recheck belt ten-
sion and adjust as required to maintain 50- 70 lbs belt
tension.
21-55-00 - COMPRESSOR ASSEMBLY INSPEC-
TION AND MAINTENANCE PROCEDURE
The compressor assembly requires more inspection
than maintenance since field repair with first line tech-
nicians is limited. Inspection consists of checking for
excessive oil leaks, belt alignment/tension and refriger-
ant leaks. The compressor should be periodically
checked at 500- 800 hours of operation in which the fol-
lowing should be performed.
21-55-01 - SPECIAL TOOLS AND EQUIPMENT
REQUIRED
1. Small hand tools and socket set
2. R- 134a charging manifold, with gauges and
hoses
3. R- 134a electronic leak detector
4. R- 134a refrigerant cylinder
5. Leak check liquid (soapy solution)
6. Hand and eye protection
7. Thread sealant (Loctite # 554)
8. Dry nitrogen, regulated
9. Isopropyl Alcohol, flush liquid
21-55-02 - COMPRESSOR INSPECTION PROCE-
DURE
1. Verify aircraft power to system is OFF.
2. Remove cowling to gain access to compressor.
3.
Inspect belt for alignment per Section 21-54-03.
4.
Inspect belt for tension per Section 21-54-04.
5. Visually inspect compressor pulley for excessive
wear, nicks, cracks or looseness.
6. Visually inspect compressor shaft for excessive oil
leaks.
-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.
Loos
en belt tension. See Section 21-54-04, for re-
verse 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
prevent water, dust or other contaminates
from entering 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.
21-55-00
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