Chevrolet 70 1969 Series, Shop Manual

Page: 656 / 913

POWER BRAKE 5-47
POLYURETHANE F O A M FILTER A R RA N G EM EN T
PAPER FILTER AR RA N G EM EN T
F igure 5 — C o m p re sso r A ir Stra in e r C o m p o n e n ts
and cylinder head are so designed, that the m ethod of as­
sembly m ay be varied to m eet different installation re­
quirem ents. All of these parts should be m arked before
disassembling, to assure proper positioning at assembly.
Refer to Figure 1 for cross-section of complete compressor
assembly.
AIR STRAINER REM OVAL
A N D DISASSEMBLY
TYPE WITH PAPER FILTER (Fig. 5)
1. Rem ove clip-on cover.
2. Remove paper filter elem ent and discard.
3. Rem ove two cap screws securing m ounting baffle to
com pressor.
4. Rem ove m ounting baffle unit.
Spring Seat
Plunger
Assembly
Spring
Spring Saddle
Plunger
Piston
Figure 6 — Unloader Assem bly Com ponents
TYPE WITH POLYURETHANE
FOAM FILTER (Fig. 5)
1. Remove two cap screws securing the air strainer to
compressor.
2. Remove air strainer assembly.
3. Remove two cross recess screws on air strainer cover.
4. Remove foam filter elem ent and discard.
NOTE: Refer to "Cleaning, Inspection, and Re­
pair" in this manual for servicing of air strainer
components.
UNLOADER ASSEMBLY REM OVAL
Parts are available in a kit for replacing unloader as­
sembly. U nloader parts (figs. 6 and 7) m ay be changed
without removing cylinder head. The unloader assem bly is
located in the block.
1. Remove air inlet elbow and discard gasket.
2. Insert screwdriver blade under unloader spring and
raise spring off unloader spring saddle. Remove
spring and spring saddle.
3. Lift each plunger guide, then remove guide and plung­
er. Lift pistons out of bores. If piston is not easily re­
moved, use shop air pressure as shown in Figure 7.
G O V ERN O R ASSEMBLY REMOVAL
WHEN MOUNTED TO CYLINDER BLOCK
1. Remove both cap screws and washers which attach
governor to block.
2. Remove governor and discard governor gasket.
W HEN REMOTELY M O UNTED
TO CYLINDER HEAD
1. Loosen two cap screws which attach the governor
bracket to air com pressor head.
CHEVROLET SERIES 70-80 HEAVY DUTY TRUCK SH O P M A N U A L