Chevrolet 1977 10 Series, Руководство по ремонту, Страница: 17 / 468

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AIR CONDITIONING IB-11
OIL PICK-UP TUBE REMOVER J-5139
OIL PICK-UP TUBE
Fig. 2 8 -- Rem ov in g Oil Pick-U p T ub e
head.
D iscard O-ring.
It may be necessary to tap on outside of front head,
using a plastic hammer, to overcome friction of O-ring seal
between front head and com pressor shell.
17. W ipe excess oil from sealing surfaces on front head
casting webs and examine sealing surface. If any surface
damage is observed, the head should be replaced.
18. Remove front discharge valve plate assembly and
front suction reed plate. Examine reeds and seats. Replace
necessary parts.
19. Remove suction cross-over cover by prying with
screwdriver between cylinder casting and cover (Fig. 29).
20. Examine internal mechanism for any obvious
damage. If internal mechanism has sustained major damage,
due to loss of refrigerant or oil, it may be necessary to use
the Service internal mechanism Assembly rather than
replace individual parts.
INTERNAL M EC H A N ISM
Disassembly
Use P arts Tray J-9402 (Fig. 33) to retain compressor
parts during disassembly.
1. Remove internal m echanism from com pressor as
described in "C om pressor Internal Mechanism" Removal
procedure.
2. Identify by pencil m ark, or some other suitable
means, each piston num bering them as 1,2, and 3 (Fig. 30).
N um ber the piston bores in the front cylinder half in
like m anner, so th at pistons can be replaced in their original
locations.
3. Separate cylinder halves, using a wood block and
mallet (Fig. 31). M ake certain that discharge cross-over tube
does not contact axial plate when separating cylinder halves
(a new Service discharge cross-over tube will be installed
later).
CAUTION: UNDER NO CIRCUM STANCES
SHOULD SH A F T BE STRU CK A T EITHER
EN D in an effort to separate upper and lower
cylinder halves because the shaft and the axial
plate could be damaged.
4. Carefully remove the rear half of the cylinder from
the pistons and set the front cylinder half, with the piston,
shaft and axial plate in Compressing Fixture J-9397.
5. Pull up on com pressor shaft and remove piston
previously identified as No. 1, with balls and shoe discs,
from axial plate.
a.
Inspect the Teflon piston rings
for nicks, cuts
or metal particles imbedded in exposed ring surface and
Fig. 3 0 - N u m b e r i n g Piston and C y lin d e r Bores
Piston
Front
Cylinder Half
SUPPORT
CYLINDER
ASSEMBLY
SUCTION
PASS COVER
Fig. 2 9 - R e m o v i n g S u c t io n Cross Over Co ve r Fig. 3 1--S eparati ng C y lin d e r Halves