![background image](http://html1.mh-extra.com/html/gmc/c-series-1993/c-series-1993_repair-manual_2235927153.webp)
5J-16 AIR COMPRESSOR AND GOVERNOR
300. Rubber Cover
301. Cover Retaining Ring
302. Jam Nut
303. Upper Spring Seat
304. Adjuster Screw Spring
305. Lower Spring Seat
306. Spring Guide
305
303
308. Adjuster Screw
'
316. Valve Spring
309. Piston Grommet
: ; 317. Piston Grommet
310. Exhaust Stem
318. Governor Body
V!,!,' ;■
B6890
Figure 28—Governor Components
ASSEMBLY
Lubricate the governor body bore, piston top and
grooves, grommets, spring guide, and adjusting
screw with barium base grease-
install or Connect (Figure 29)
1. Lower spring seat (307), spring guide (306), lower
spring seat (305), and adjuster screw spring (304)
on the adjuster screw (308).
2. Adjuster screw into the upper spring seat (303).
• Screw in until the dimension from the top of the
seat to the bottom of the stem hand is 48 mm
(1 7/8 inch) as shown in figure 52.
3. Jam nut on adjuster screw (308).
• Place adjuster screw in a vise with soft jaws to
install jam nut.
4. New exhaust stem grommet (313) in the groove
inside the piston (314).
5. A new washer (313) in the piston (314).
• Prick punch the washer in four places.
6. Two new piston grommets (309 and 317) on the
piston (314).
7. Exhaust stem spring (311), exhaust stem (310),
valve (315), and valve spring (316).
• The narrow end of the inlet valve spring is
against the valve,
8. Piston assembly.
9. Rubber cover (300).
10. Two . pipe plugs.
^
e s t s
-
a f t e r
r e p a ir
Make this test using shop equipment or with the unit
installed in the vehicle.
Operating Test
1. Start the engine and build up air pressure.
2. Observe the reading on the air pressure gage
when: the governor cuts-out.
• Sde “ Specifications” for cut-out pressure.
3. With the engine still running, slowly, reduce the air
pressure by applying and releasing the brakes.
4. Observe the gage pressure when the governor
cuts-in.
Figure 29—Adjusting Screw Measurement
• See “Specifications” for cut-in pressure.
Important
• Before condemning or adjusting the governor,
check the dash air gage. Use an accurate test
gage to , verify the pressure shown on the dash
gage.
5. If the. pressure settings need changing, adjust the
governor.
Adjustment (Figure 29)
1. Remove the cover from the top of the governor.
2. Loosen:the adjusting screw nut.
3. Using a screwdriver, turn the adjusting screw to the
left-(counterclockwise)1 to raise the pressure set
tings, i Turn the screw to the right (clockwise) to
lower the pressure setting.
4. Tighten the nut..
5. Install the cover. ;
Summary of Contents for C Series 1993
Page 1: ......
Page 12: ...OA 6 GENERAL INFORMATION Figure 11 Allison Transmission I D Location ...
Page 44: ...3B1A 2 POWER STEERING GEAR UNIT REPAIR Figure 1 710 Power Steering Gear ...
Page 62: ......
Page 75: ...3B3 2 POWER STEERING COMPONENTS TRW ROSS ...
Page 121: ...5H 16 AIR BRAKE VALVES Figure 21 Bendix Proportioning Relay Valve Components ...
Page 147: ...5J 10 AIR COMPRESSOR AND GOVERNOR 286 F9051 Figure 18 Bendix BX 2150 Compressor Components i ...
Page 204: ...MODEL 295 TBI UNIT 6C1 3 F7973 Figure 3 Model 295 TBL Unit ...
Page 251: ...6D4 6 37 MT STARTER MOTORS V3022 Figure 8 37 MT Components ...