Replacement Of Compressor Drive Belt; Adjustment Of Drive Belt Tension - Piper Navajo Chieftain PA-31-350 Service Manual

NAVAJO CHIEFTAIN SERVICE MANUAL
k. Open both service valves fully (counterclockwise) on the compressor.
1. Carefully remove the blue line from the low pressure valve. This line will contain a small amount
of refrigerant.
CAUTION
It is advisable to cover hands before removing the line from the
gauge fitting to prevent skin from coming in contact with cold
refrigerant.
m. Replace gauge port cap on the low pressure valve and both valve stem caps.
14-107. REPLACEMENT OF COMPRESSOR DRIVE BELT.
a. Loosen the adjustment bolts on the mounting bracket.
b. Push the compressor toward the engine to relieve the belt tension.
c.
Loosen alternator belt tension.
d. Remove propeller and starter fly wheel. (Refer to Section VIII.)
e. Remove alternator and compressor belts.
f. Put the new belt in position on the engine. Reinstall the alternator belt.
h.- Install starter fly wheel, putting the compressor and alternator belts in their respective grooves
and slide fly wheel on the crankshaft. (Do not adjust belt tensions at this time.)
i. Install propeller. (Refer to Section VIII.)
j. Install the alternator belt. (Refer to Section XI.)
k... Install the compressor belt on the compressor pulley. Adjust belt tension. (Refer to paragraph
14-108.)
14-108. ADJUSTMENT OF DRIVE BELT TENSION. The adjustment of the compressor drive belt is very
important to obtain long belt life and proper compressor operation. See Table XIV-XIII for alternator and
refrigerant compressor belt tensions for TIO-540-J2BD engine. Recheck new belt tension after 10 hours of
operation.
TABLE XIV-XIII. BELT TENSIONS (TIO-540-J2BD - ENGINE)
(WITH FREON COMPRESSOR INSTALLED)
BELT
GATES # 150
ACTUAL MEASUREMENT
BELT
CONDITION TENSIOMETER
LOAD VS DEFLECTION
Alternator
New
99 lbs. 6.31 lbs. - .16 in.
*Service
66 lbs. 4.25 lbs.- .16 in.
Refrigerant
New 104 lbs.
6.75 lbs. -. 14 in.
Compressor
*Service
69 lbs. 4.50 lbs. - .14 in.
*Pertains to a belt that has been in use for longer than one hour
Reissued: 9/23/80
ACCESSORIES AND UTILITIES
4 H9