![background image](http://html1.mh-extra.com/html/gmc/s-series-1994/s-series-1994_repair-manual_2235929389.webp)
• Rocker arm areas that contact the valve stems and
the socket areas that contact the ends of the push-
rods. These areas should be free of wear or dam
age.
• Rocker arm nuts.
• Pushrod ends for scoring, roughness, or bends.
— Roll the pushrod on a flat surface to determine
its straightness. If the rod is bent, the rod will
not roll freely. Replace if necessary.
HYDRAULIC LIFTERS
The type of hydraulic lifters used in this engine are
the roller type.
Hydraulic lifters are serviced only as an assembly.
No
internal parts are available.
Important
Whenever the camshaft needs to be replaced, a
new set of hydraulic lifters must also be installed.
CYLINDER HEAD
Cylinder head disassembly is covered in this proce
dure. Refer to SECTION 6A for information regarding
the following:
• Cleaning
• Inspection
• Measuring clearances
• Valve grinding
• Valve guide reconditioning
DISASSEMBLY
Remove or Disconnect (Figures 30 and 31)
Tool Required:
J 8062 Valve Spring Compressor
1. Valve keepers (20).
A. Compress the springs with J 8062 (figure 31).
B. Remove the keepers.
C. Remove J 8062.
2. Intake valve components (figure 30).
A. Cap (21)
20. Valve Keeper
21. Cap
22. Shield
23. O-Ring Seal
24. Seal
25. Damper
26. Spring
27. Intake Valve
28. Rotator
29. Exhaust Valve
B7609
B. Shield (22)
C. Seal (24)
D. Damper (25)
E. Spring (26)
3. Exhaust valve components (figure 30).
A. Rotator (28)
B. Shield (22)
C. Seal (24)
D. Damper (25)
E. Spring (26)
4. O-ring seals (23).
5. Valves (27 and 29).
• Place the valves in an organizer rack so they
can be replaced in their original position at
reassembly.
ROCKER ARM STUD REPLACEMENT
The 4.3L VIN Z engine can be equipped with two
different rocker arm stud configurations that require dif
ferent valve lash procedures.
If you have a 4.3L VIN Z engine that has screw-in
rocker arm studs with positive stop shoulders, you must
follow the replacement procedures outlined below under
“ Screw-In Studs.” No valve adjustment is necessary.
When the valve train requires service, you simply tight
en the rocker arm nuts to 27 N-m (20 ft. lbs).
If you have a 4.3L VIN Z engine that has pressed-in
rocker arm studs, you must follow the replacement pro
cedures outlined below under “ Pressed-ln Studs” and
the valve adjustment procedure outlined under “Valve
Adjustment.”
Screw-In Studs
Remove or Disconnect
Rocker arm stud by unscrewing.
|-^+| Install or Connect
NOTICE: Refer to “Notice” on page 6A3-1.
Summary of Contents for S Series 1994
Page 1: ......
Page 11: ...VIEW A p n n n j VIEW C F7554 Figure 10 Hydra Matic 4L60 E Transmission I D Location...
Page 24: ...NOTES...
Page 26: ......
Page 69: ...NOTES...
Page 71: ...3 2 STEERING...
Page 73: ......
Page 84: ......
Page 102: ...40...
Page 130: ...NOTES...
Page 146: ...NOTES...
Page 162: ...NOTES...
Page 166: ...Figure 5 Removing the Pinion Flange Figure 6 Pressing the Drive Pinion from the Cage...
Page 178: ...Figure 3 Spreading the Differential Case Figure 4 Removing the Differential...
Page 190: ...NOTES...
Page 202: ...NOTES...
Page 206: ...F5785...
Page 212: ...B Button Moved Out of Bearing Bore F5791...
Page 228: ...NOTES...
Page 232: ......
Page 234: ......
Page 236: ...Adjuster 63 Bolt 64 Lock Figure 10 Turning the Adjuster Plug K3 Models...
Page 237: ...Figure 13 Removing the Pinion Seal 39 Bearing Cup Figure 16 Removing the Inner Bearing Cap...
Page 261: ...F7475...
Page 267: ...B Button Moved Out of Bearing Bore F5791...
Page 294: ...NOTES...
Page 300: ...NOTES...
Page 318: ...NOTES...
Page 322: ...SR207LN2 EDS...
Page 324: ......
Page 326: ...OVERHEAD OILING AND RETURN MAIN OIL GALLERY N30005 6A2 J EDS...
Page 368: ...103 153 127 V1200...
Page 370: ......
Page 372: ......
Page 374: ...F9375 Figure 7 Engine Lubrication Diagram Engines Without Balance Shaft...
Page 376: ...Figure 9 Engine Lubrication Diagram Engines With Balance Shaft...
Page 399: ...V2974...
Page 410: ......
Page 412: ...195 196 201 174 252 163 165 164 244 3706r3924...
Page 452: ......
Page 454: ...163 164 V1202...
Page 456: ...20 21x 302 210 4 0 41 2 5 2 5 1 2 51 4 2 e3 54 3 9 252 252 S 255 255 25 6 256 209 V1196...
Page 458: ...100 1 8 4 185 183 177 v 75 201 3706r1204...
Page 460: ......
Page 510: ......
Page 512: ...V2131...
Page 514: ...110 106 106 103 90 93 89 88 87 86 v 7 7 7 7 j A _ 111 f t 2 a a s 53 49 L 47 46 3706r4751...
Page 516: ...259 260 150 237 S lM 180 167180 J 1 82 183 170 169 1 1 78 1 7 9 213212 2 0 7 205 r i 3706r4752...
Page 566: ...NOTES...
Page 574: ...NOTES...
Page 618: ...SPECIAL TOOLS...
Page 620: ...NOTES...
Page 672: ......
Page 682: ......
Page 686: ......
Page 694: ...RH0213 4L60 E...
Page 695: ...657 659 m i J 8092 H J 34196 4 3 34196 5 657 658 665 J 23907 J 7004 1 J 8092 RH0214 4L60 E...
Page 696: ...J 8092 J 34196 4 33 31 J 8092 RH0215 4L60 E...
Page 697: ...SPECIAL TOOLS...
Page 698: ...SPECIAL TOOLS...
Page 758: ...RH0194 4L80 E...
Page 764: ......
Page 770: ...SPECIAL TOOLS...
Page 771: ...SPECIAL TOOLS CONT...
Page 772: ......
Page 775: ......
Page 776: ......
Page 785: ......
Page 804: ...NOTES...
Page 806: ......
Page 808: ......
Page 822: ...3707r5079...
Page 840: ......
Page 848: ...NOTES...
Page 852: ......
Page 860: ...F5435...
Page 866: ......
Page 878: ...F9167...
Page 882: ...16 FrontOutputShaft 18 DrivtQNr 19 DrivenGm t 20 DriveChain 22 FrontOutputBearing V2836...
Page 890: ...F9168...
Page 908: ......
Page 919: ......