GMC C Series 1993, Repair Manual

Page: 151 / 264

5J-14 AIR COMPRESSOR AND GOVERNOR
If excessive leakage is found, leave the air pressure
applied and with a fiber or hardwood dowel and ham­
mer, tap the discharge valves off their seats to reduce
the leakage. With the air pressure still applied, check
for leakage around the discharge valve cap nut on the
top of the cylinder head casting. No leakage is permit-,
te d .' '
INLET VALVE AND SEAT
1. Replace valve and spring.
2. If the seats are scratched or nicked, dress with fine
emery' doth or lap with a lapping stone or grinding
stone and grinding tool. Replace if damaged.
BENDIX BX-2150 AIR COMPRESSOR ASSEMBLY
CRANKSHAFT
Install or Connect (Figures 18 and 19)
1. Oil seal (287).
• Press the oil seal into the crankcase until it is
flush with the crankcase casting. . ^
2. Front ball bearing (275) on the crankshaft.
3. Front ball bearing and crankshaft into the crank-
■ base. ■
• Use care not to damage the oil seal (287).
4,0-ring (278) in the groove around the end cover
assembly (280).
5. Thrust washer (281) and end cover assembly
(280).
• Note the marks made at disassembly.
N O T IC E : S e e “N o tic e ” o n p a g e 5 J -1 .
6. Four machine screws and spring washers (279).
Tighten m
• Machine screws to 23 N-m (17 ft. lbs.).
PISTON AND CONNECTING ROD
Important A
When installing new piston pin bushings (273), line
up the oil hole with the hole in the rod.
2. Piston pin (273).
3. Piston pin plug (272).
7
4. Piston rings (270) to the piston (271) (pip marks
up). , . . " ‘t'.i ; _
• Stagger the ring gaps 180 degrees.
• Coat the piston, piston rings, piston pin and
, connecting rod bearings with clean motor oil.
5. Crankshaft journal bearing inserts in the connecting
rod (274) and connecting rod cap (283).
• Remove the bolts and bearing cap from the
connecting rod.
• Turn the crankshaft to center the rod journal in
, . vthei ciownward position.
. 6. J 8037 on piston (11).
7. Connecting rod (274) with the piston (271) through
the top of the cylinder bore (288).
8. Install piston (271) with J 8037 (figure 26).
, • insert piston 6mm (1/3 inch) below the surface
of the cylinder bore before removing the tool.
9. Connecting rod cap (283).
y
Align the marks made at disassembly. ...
10. Connecting rod bolt locks (284).
N O T ld E : S e e “N o tic e ’? o n p a g e 5 J -1 .
11. Connecting rod bolts: (285).
Tighten
S t
• Bolts (285) to 15'N.m ( i t ft. lbs.).
12. Bend the tabs of the connecting rod bolt locks
(284) against the flats of the hex head connecting
rod bolts (285). !;
CYLINDER HEAD
Install or Connect (Figures 18 and 19)
1. Discharge valve spring (266), discharge valve
(267); and discharge valve seat (268).
Tighten
• Discharge valve seat (268) to 108 N.m (80 ft.
■ ; lbs.). -
2. Unloader piston stop (260) and O-ring (262).
Q | Tighten
Unloader piston stop; (260) to 23 N.m (17 ft.
lbs.).