Section 22: HEATING AND AIR CONDITIONING
PA1562
21
7.1.3 Pulley Alignment
In order to avoid skipping, disengagement and a
premature wear of compressor belt, it is
necessary to align compressor pulley with the
crankshaft pulley. Before performing the
following procedure, release air from belt
tensioner bellows by means of the air pressure
releasing valve. After completing these
procedures reset belt tensioner air pressure
regulator to 50 psi (345 kPa).
7.1.4 Longitudinal Compressor Alignment
1. Rest an extremity of a straight edge of
approximately 46 inches (117 cm) against
the upper part of the outer face of crankshaft
pulley, positioning the other end close to the
compressor clutch pulley (Figs. 23 & 24).
2. Check the distance between each extremity
of straight edge (1. Fig. 23) and the first
drive belt. If they are different, loosen the
compressor support bolts and with a
hammer, knock support to slide it in order to
obtain the same distance; then tighten bolts.
7.1.5 Horizontal Compressor Alignment
1. Rest an extremity of the straight edge
against the upper part of the outer face of
compressor pulley, positioning the other end
close to the crankshaft pulley.
2. Check the distance between each extremity
of straight edge (1, Fig. 24) and drive belt. If
they are different, loosen the pillow block
compressor bolts and with a hammer, knock
compressor pillow block to slide it, in order
to obtain the same distance; then tighten
bolts.
FIGURE 23: COMPRESSOR ALIGNMENT 22072
7.1.6 Vertical Compressor Alignment
Rest a short "angle and level indicator" on the
outer side face of the crankshaft pulley, adjust
the level indicator inclination at 0
o
and check if
the compressor pulley is at same angle (Fig.
23). If it is not the same, shim under the
appropriate pillow block in order to obtain the
correct angle.
FIGURE 24: COMPRESSOR ALIGNMENT 22040
7.1.7 Compressor Maintenance
For the maintenance of the A/C compressor,
see the Carrier Compressor “WORKSHOP
MANUAL for MODEL 05G TWIN PORT
COMPRESSOR” included at the end of this
section.
CAUTION
Use only Castrol SW 68 (POE) oils with
refrigerant 134a.
7.1.8 Troubleshooting Guide
A preliminary check may be made by simply
feeling the cylinder heads with the unit in
operation at ambient temperatures of 35
o
F (2
o
C)
and over. The cylinder heads are internally
divided into suction and discharge valves. The
lower half of the cylinder head is the suction
side, and it should be relatively cool to the touch,
as opposed to the hot upper discharge side. If a
valve plate or head gasket is blown, or a
compressor unloader is stuck open, partially
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