GMC 1976 ZEO 6083 Maintenance Manual page 108

Figure 85-Teflon Piston Ring Positioned on Ring
Installer Guide
1 . Remove the old piston rings by CAREFULLY
slicing through the ring with a knife or sharp instru-
ment, holding the blade almost flat with the piston
surface. Be fareful not to damage the aluminum pis-
ton OF piston groove in cutting to remove the ring .
WARNING : EXERCISE PERSONAL CARE IN
CUTTING THE PISTON RING FOR REMOVAL .
2. Clean the piston and piston ring grooves with
a recommended cleaning solvent and blow the piston
dry with dry air (Trichlorethylene, naphtha, stod-
dard solvent, kerosene, or equivalent).
3 . Set the piston on end on a clean, flat surface
and install the Ring Installer Guide J-24608-2 on the
end of the piston (figure 89).
4. Install a Teflon ring on the Ring Installer
Guide J-24605-2 as shown in Figure 85, with the
dished or dull-side down and glossy-side up .
5. Push the Ring Installer J-24608-5 down over
the Installer Guide J-24608-2 to install the Teflon
ring in the piston ring groove (figure 86) . If the Te
flon ring is slightly off position in the ring groove, it
can be positioned into place by fingernail or blunt-
edged tool that will not damage the piston .
The Ring Installer J-24608-5 will retain the In-
staller Guide J-24608-2 internally when the Teflon
ring is installed on the piston . Remove the Installer
Guide from the Ring Installer and
DO NOT STORE
THE INSTALLER GUIDE IN THE RING INSTALLER, as the
Ring Installer Segment Retainer O-Ring J-24608-3 will be
stretched and possibly weakened during storage.
This
could result in the O-Ring J-24608-3 not holding the
Ring Installer segments tight enough to the Installer
Guide J-24608-2 to peroperly install the Teflon ring
on the piston .
6. Lubricate the piston ring area with 525 vis-
cosity refrigerant oil and rotate the Piston and Ring
AIR CONDITIONING SYSTEM 1- 9 1
Figure 86-Installing Teflon Piston Ring
Assembly into the Ring Sizer J-24608-6
at a slight
angle
(figure 88) . Rotate the piston, while pushing
inward, until the piston is inserted against the center
stop of the Ring Sizer J-23608-6.
Figure 87-Teflon Piston Ring Installed on Piston
Groove