GMC C Series 1993, Repair Manual

Page: 145 / 264

5J-8 AIR COMPRESSOR AND GOVERNOR
INLET VALVES AND SEATS
1. Replace valves and springs.
2. If the seats are scratched or nicked, dress with fine
emery cloth or lap with a lapping stone or grinding
stone and grinding tool. Replace if damaged.
BENDIX TU-FLO 550 AIR COMPRESSOR ASSEMBLY
CRANKSHAFT
|~M*| Install or Connect (Figure 3)
1. Press ball bearing (32) on crankshaft (33).
2. Drive adapter.
3. Crankshaft (33).
4. Seal (31) on end cover (30).
5. End cover (30)..
• Align the marks made during disassembly.
N O T IC E : S e e " N o tic e ” o n p a g e 5 J -1 .
6. Bolts (29).
Tighten
• Bolts (29) to.38 N,m (28 ft. lbs.)
PISTONS AND CONNECTING
RODS
Important
• When installing new piston pin bushings (27), line
up the oil hole with the hole in the rod.
0 Install or Connect (Figures 3 and 17)
Tools Required:
J 8037 Ring Compressor
N O T IC E : F o r s te p s 11 a n d 13, s e e “N o tic e ”
o n p a g e 5 J -1 .
1. Bushing (27) in the connecting rod (28).
2. Connecting rod (28) to the piston (26).
3. Wrist pin (25).
4. Wrist pin retainer (24).
5. Piston rings (21), expander ring (23), and oil rings
(22) to the piston (11) (pip marks up).
A. Stagger the ring gaps 90 degrees.
B. Coat the piston, piston rings, wrist pin, and con­
necting rod bearings with clean motor oil.
6. Connecting rod bearing inserts (34) in the connect­
ing rod and cap.
A. Remove the bolts and bearing cap from one
connecting rod.
B.
Turn the crankshaft to center one rod journal in
the downward position. i
7. J 8037 on piston. '
8. Connecting rod (28) with the piston (26) through
the top of the cylinder bore;
9. Install piston with J 8037 (figure 17).
•: Piston should be 6 mm (1/3 inch) below the
surface Of the cylinder bore before removing the
tool-
10. Connecting rod cap (35) (align the reference
marks).
11. Connecting rod bolts (36).
•;New connecting rod bolts should be used.
Tighten
• Bolts (36) to 15 N-m (11 ft. lbs.).
N O T IC E : S e e " N o tic e ” o n p a g e 5 J -1 .
12. Second connecting rod and piston.
13. Connecting tod bolts (36).
Tighten
• Bolts (36) to 15 N.m (11 ft. lbs.).
CRANKCASE
b a s e p l a t e o r
ADAPTER
I * * ! Install or Connect (Figure 3)
1: New gasket (39).
2. Base plate or base adapter (40).
• Align the marks made during disassembly,.
N O T IC E : S e e " N o tic e ” o n p a g e 5 J -1 .