GMC 1976 ZEO 6083 Maintenance Manual page 199

INTAKE VALVE REPLACEMENT
REMOVAL
1 . Remove air compressor from vehicle .
2 . Remove four screws from piston dome .
Remove piston dome and its gasket, then remove
valve plate and its gasket .
3 . Remove piston sleeve .
4. Remove screw from valve on top of piston and
remove valve .
INSTALLATION
ton.
1 . Install valve and screw retaining it on the pis-
2. Install piston sleeve .
3. Install valve plate and its gasket and install
piston dome and its gasket . Install four screws in
piston dome .
EXHAUST VALVE REPLACEMENT
REMOVAL
1 . Remove air compressor from vehicle.
2. Remove four screws from piston dome.
Remove piston dome and its gasket . Remove valve
plate and its gasket .
Figure 34-Removing Retaining Screw From Exhaust
Valve
INSTALLATION
3. Remove piston sleeve .
4. Remove air filter .
REAR SUSPENSION 4- 1 5
Figure 35-Loosening Allen Screw on Eccentric
3. Remove retaining screw from exhaust valve
and remove valve as shown in Figure 34.
4. Remove "O" ring under valve.
1 . Install "O" ring by first applying a small
amount of silicone rubber cement or equivalent in
recess for "O" ring . Then set "O" ring in place.
2. Install valve and retain in position on valve
plate with screw.
3. Install valve plate and its gasket, and install
piston dome and its gasket . Replace four screws in
piston dome.
PISTON REPLACEMENT
REMOVAL
1 . Remove air compressor from vehicle .
2. Remove four screws from piston dome .
Remove piston dome and gasket . Remove valve plate
and gasket .
5. Rotate eccentric (figure 36) until piston is at
the bottom of its stroke .