GMC 1989 Light Duty Truck, Repair Manual, Page: 95 / 998

SD-709 AIR CONDITIONING COMPRESSOR 1B5-1
SECTION 1B5
SD-709 AIR CONDITIONING
COMPRESSOR
CONTENTS
SUBJECT PAGE
D e s c rip tio n ................................................................................................................................................................................... 1B5-1
In s p e c tio n ..................................................................................................................................................................................... 1B5-1
Compressor R e p la c e m e n t....................................................................................................................................................... 1B5-1
Disassembly of the Clutch and Shaft S e a l............................................................................................................................1B5-1
Assembly of the Clutch and Shaft S e a l ................................................................................................................................
1
B
5-4
Disassembly of the Cylinder Head and Valve P la te ........................................................................................................... 1B5-6
Assembly of the Cylinder Head and Valve P l a t e ................................................................................................................ 1B5
6
Specifications................................................................................................................................................................................... 1 B 5-7
F a s te n e r s ......................................................................................................................................................................................... 1B5-7
Special Tools.....................................................................................................................................................................................1B5-8
DESCRIPTION
The Sandon SD-709 is a belt-driven seven cylinder com ­
pressor with an integral clutch. The clutch, shaft seal, cylin­
der head and valve plate assem blies are fully serviceable.
The com pressor can be identified by a label attached to
the compressor body giving the part number, model, and
m anufacturer’s name. The date code is stamped on the
front left mounting ear viewed as facing the clutch (figure 1).
It will be either a two-digit num ber or a num ber-letter com bi­
nation. The first num ber gives the year of m anufacture.
This is followed by one of the num bers 1 through 9, indica­
ting the months January through September. October,
November or December are indicated by an X, Y, or Z.
INSPECTION
LEAK CHECK
Before disassem bling any com pressor com ponents,
check for leaks in the following areas:
1. Feel under the seal area between the clutch and com ­
pressor to check for oil seeping in the shaft seal area.
If so, the seal will have to be replaced.
2. Check for dislocation of the front housing O-ring (pro­
truding section). Replace the compressor.
3. Oil around the c y lin d e r head g a ske t or fittin g s .
Replace leaking component.
4. Oil around the filler hole. If the O-ring is dam aged, it
can be replaced. If the threads are stripped, replace
the compressor.
5. Oil leaking from cracks in the cylinder block. Replace
the compressor.
COMPRESSOR REPLACEMENT
If the com pressor needs to be replaced, first drain and
measure the oil in the old com pressor. Then drain the oil
from the new compressor. Measure the new oil equal to the
amount drained from the old compressor. Then put the new
oil back in the compressor.
DISASSEMBLY OF THE
CLUTCH AND SHAFT SEAL
CLUTCH
Remove or Disconnect (Figures 2 through 9)
Tools Required:
J 37791 Clutch Front Plate Spanner W rench
J 36045 Front Plate Puller
J 37792 Puller Fingers
J 8433 Puller Set
J 37795 Bearing Remover and Installer/Pulley
Installer
J 29886 Driver Handle
Insert the two pins of the J 37791 into any two
threaded holes of the clutch front plate (2). Hold the
clutch plate stationary (figure 3).