Mooney M20R - Compressor Assembly Inspection and Maintenance; Compressor Inspection; Compressor Removal; Drive Belt Tensioning

MOONEY
AIRC RAFT CORPORATION
M20R
SERVICE
AND
MAINTENANCE
MANUAL
ment
between idler
and
compressor
sheave
outer
t~ulley.
hours of
operation
in which
the
following
should be
per-
V\i~en alignment
is
correct,
the
extended
arm
will
fall
into
formed.
the center of the bottom of
groove
of
compressor
outer
pulley
groove
within 0.020 inch.
2155-01 SPECIAL
TOOLS AND
EQUIPMENT
REQUIRED
E.
Re-install idler
sheave
assembly
and
torque
screw
to
800-850 in. Ibs.
1. Small hand tools and
socket
set
3. VERIFICATION OF PROPER ALIGNMENT
FOR
ALL
2. R-134a
charging
manifold,
with
gauges
and hoses
PULLEYS
3. R-134a
electronic
leak
detector
A.
After
torquing
of all
sheave
assemblies,
icheck
alignment
of all
pulleys
to
verify
belt will
not
run
w/th
any
4.
R-134a
refrigerant
cylinder
misalignment during engine operation.
5. Leak check
liquid
(soapy
solution)
B. Belt is
ready
for
tensioning.
See Section
21-5/1-04.
6.
Hand
and
eye
protection
2154-04
DRIVE BELT TENSIONING
7.
Thread
sealant
(Loctite
55431)
PROCEDURE
8.
Dry nitrogen, regulated
i.
Verify
all
compressor,
starter/accessory
dri~e and
9.
Isopropyi
Alcohol,
flush
liquid
idler
pulley mounting
hardware is
tight
and belt is
prjoperly
2155-02
-COMPRESSOR
INSPECTION
aligned
per
Section 21-54-03.
PROCEDURE
2. Slide idler
pulley snugly
against
belt and
t/ighten
adjusting
bolt
finger
tight
into its socket.
1.
Verify
aircraft
power
to
system
is
OFF.
NOTE
2. Remove
cowling
to
gain
access
to
compressor.
At this
stage,
idler
pulley
should be
rotatabl~ by
3.
Inspect
belt for
alignment
per
Section
21-54-03.
hand
beneath belt.
4.
Inspect
belt for
tension
per
Section
21-54-04.
3.
Tighten adjusting
bolt
two
full
turns.
5.
Visually
inspect
compressor
pulley
for
excessive
4.
Secure
adjusting
bolt
jam
nut
(275-325
in.
Ibg.)
and
wear,
nicks,
cracks
or
looseness.
idler
pulley
slide
nut
(300-350
in.
Ibs.).
6.
~sually inspect
compressor
shaft
for excessive
oil leaks.
5.
Confirm belt tension is 50-70 Ibs.
by
one
iof
the
NOTE
following
methods.:
If
excessive oil
is
found,
compressor
should be
A. Use
a
direct
reading
belt tension
gauge
sljlch
as
checked for leaks.
Use
fluid
or
leak
detector
as
Burroughs
Tool No.
BT-33-73F.
or
required.
If
leak is
found,
compl
should
be
replaced.
If
compressor
has
not
been
operated
for
B. Measure belt deflection under
a
five
(5)
Ib.
Iload
at
36-60
days
or more
the
dynamic
shaft
seal
may
the
center
of the
longest
belt
span.
correct
deneqtion
is have
a
small
leal;
due
to
lack
of oil
on
seal
.3 .4 inches.
surface.
Operation
of
system
should
eliminate
this
type
i~f
leak. If
not,
replace
compressor.
NOTE
A
spring
loaded force
gauge
is
required
for
ithis
7. Check
all fasteners
for
looseness.
F~torque
as
required.
procedure.
8.
Visually inspect
drive
belt
for
cracks,
wear
and
ex-
6. If
belt tension
is
not
within the above
tolelance,
cessive
oil.
loosen
adjusting
screw
jam
nut
and idler
pulley
slide
nut
9. Clean
all
oil
and other
contaminates
from belt
with
and
re-adjust
the
tension
per
paragraph
B
through
E.,
1
clean
shop
rag.
or
2,
above.
NOTE
NOTE
Checking
compressor
oil
quantity
is
required
only
One
(1)
full
turn
of
adjusti?g
screw
results in
gbout
if
an
excessive
amount
of
oil
is
observed
due
to
a
ten
Ib.
change
In
belt
tension,
leaks
or
system
has
been
vented
very
quickly
thereby
causing
a
loss
of oil.
An oil
ch~eck
can
be
WARNING
made
only
when
system
is
vented.
See Oil
Check
DO NOT OVER
TIGHTEN
BELT.
Improper
belt
Procedure,
Section
21-55-05.
tracking
or
tension
may
cause
belt
dimag~.
10. If
visual
check
is
good,
replace
any
removed
com-
7. After
five
(5)
hours of
operation,
recheck
belt
t$nsion
ponents
and
secure
all
fasteners.
and
adjust
as
required
to maintain
50-70
Ibs
belt
te~sion.
21-55-03
COMPRESSOR
REMOVAL
2155-00
COMPRESSOR
ASSEMBLY
INSPECTION
AND
MAINTENANC~
1.Verify
aircraft
power
is
OFF.
PROCEDURE
2.
Remove
cowling
to
gain
access
to
rear
of
engine
and
compressor.
The
compressor
assembly
requires
more
inspectiojl
than
maintenance
since field
repair
with first
line
technicians
is
3.
Connect
refrigerant
manifold
gauge
and
hose
as-
limited.
Inspection
consists of
checking
for
excessjive
oil
Semblies
to
system
service
ports.
leaks,
belt
alignment/tension
and
refrigerant
leak$.
The
4.
Recover
system
refrigerant
charge
per
recovery
compressor
should
be
periodically
checked
at
500-800
equipment
manufacturers
operating
manual.
21-54-04
REV.
7-96
Island Enterprises