Chevrolet 70 Series 1970, Service Manual

Page: 163 / 841

CAB AND BODY MOUNTINGS 1-132
Figure 26—Compressor Mounting (6-71 Alum. Tilt Cab Model)
the condenser, a ll refrigeration sy ste m p arts
should be cleaned and a new receiv er-d eh y d ra to r
a ssem b ly should be in stalled .
12. D rain a ll o il from co m p resso r just rem ov­
ed in a clean dry container and rep lace co m p r esso r
drain plug sc rew . M easure amount of o il drained.
S ee "Checking C om p ressor O il L evel and Adding
Oil" p reviou sly.
COMPRESSOR INSTALLATION
NOTE: B efo re in stallin g a new c o m p resso r,
rotate c o m p re sso r shaft four or fiv e tim e s . T his
p er m its proper lubrication of co m p r esso r se a l
o v er a ll its su rfa ce. B efo re co m p resso r clutch is
mounted to the new co m p r e sso r , wipe the front
fa c e of the co m p resso r thoroughly with a clean dry
cloth and, if n e c e ssa r y , clean front of c o m p resso r
with a so lv en t to rem ove any e x c e s s o il. Cleaning
c o m p resso r in th is m anner w ill prevent any o il
fro m being thrown onto the clutch su rfa c es which
would cause slip p age and eventual clutch fa ilu re.
1. Stamp refrigeran t charge of the refrigeran t
sy ste m on new c o m p r e sso r in sp ace on plate p ro ­
vid ed for th is inform ation.
NOTE: Follow procedure for rep lacin g o il in
new co m p resso r explained p reviou sly under "Re­
m oving M alfunctioning C om p ressor and Installing
N ew C om pressor."
2. In stall new co m p re sso r to engine (fig s. 26
through 29), leaving c o m p re sso r fittin g s opening
co v e r p late on the co m p re sso r.
3. R em ove co v er plate over c o m p r e sso r open­
in g s very slow ly to bleed off p r e ssu r e .
T-6951
Figure 27—Compressor Mounting (V8 Alum. Tilt Cab Model)
C A U T I O N : New compressors are
charged with a mixture of nitrogen and
Refrigerant-12 and 11 fluid ozs. of F rig -
idaire-525 viscosity oil. If the cover is
removed too rapidly, the oil will be blown
out violently with the sudden release of
pressure.
4. In stall the connector a ssem b ly to the com ­
p r e s s o r rea r head, u sin g new O -r in g s.
5. Connect the e le c tr ic a l lead to the c o il, then
in sta ll and adjust c o m p resso r drive b elt.
NOTE: Inspect c o m p resso r drive b elt. Check
and adjust USED V -b elt ten sion 80 to 90 pounds on
belt ten sion gauge (J-23573) and 120 to 130 pounds
on NEW b e lts.
Figure 28—Compressor Mounting (6-71 Conv. Cab Model)
CHEVROLET SERIES 70-90 HEAVY DUTY TRUCK SHOP MANUAL