![background image](http://html1.mh-extra.com/html/gmc/1989-light-duty-truck/1989-light-duty-truck_repair-manual_2235153437.webp)
4.3 LITER V-6 6A3-13
1. S h a ft E x te n s io n
2. P u m p B ody
3. D rive G ear and S h a ft
4. Id le r G ear
5. P u m p C over
6. P re ssure R e g u la to r Valve
7. P ressure R e g u la to r S p rin g
8. R e ta in in g Pin
9. S cre w s
10. P ic k u p S cre en and Pipe
B-09445
I?
Figure
17—
Oil Pump Components
• The pickup pipe is a press fit in the pump
body.
• Do not try to remove the screen from the pipe.
The pickup screen and pipe is serviced as an
assembly only.
Clean
All p arts in clea n s o lv e n t and blow d ry w ith
compressed air.
Inspect (Figure 17)
Pump body (2) and cover (5) for cracks or other
damage.
Gears (3 and 4) for wear.
Drive gear and shaft (3) for lack of fit in the pump
body (2).
Inside of the cover (5) for wear that would permit oil
to leak past the ends of the gears. The pump gears,
cover, and body are not serviced separately. If the
parts are damaged or worn, replace the entire oil
pump assembly.
Pickup screen and pipe (10) for damage to the
screen, pipe or relief grommet.
Pressure relief valve (6) for fit. The regulator valve
should slide freely in its bore without sticking or
binding.
Install or C onnect (Figure 17)
Tool Required:
J 21882, Pickup Tube and Screen Installer
1. Pressure regulator valve.
2. Spring.
3. Spring retaining pin.
4. Drive gear and shaft.
5. Idler gear.
• Index the marks made during disassembly.
6. Cover and screws.
$
Tighten
• Screws to 5.0 N-m (84 in. lbs.).
Turn the drive shaft by hand to check for smooth
operation.
N O TIC E: Be c a re fu l o f tw is tin g , s h e a rin g or
co llapsin g the p ip e w hile installing the p um p.
7. Pickup screen and pipe (if removed) (figure 18).
• If the pickup screen and pipe assembly was
removed, it should be replaced with a new
part. Loss of press fit condition could result in
an air leak and loss of oil pressure.
• Mount the oil pump in a soft jawed vise.
• Apply sealer to the end of the pipe.
• Tap the pickup screen and pipe into place,
using J 21882 and a hammer.
• The pump screen must be parallel with the
bottom of the oil pan when installed.
8. Oil pump drive shaft and connector (1).
VALVE TRAIN COMPONENTS
PUSHRODS, ROCKER ARMS, BALLS, AND NUTS
Clean
Parts in solvent. Blow dry with compressed air.
Make sure the oil passages in the pushrods are
clear.
Inspect
• Rocker arms and balls at their mating surfaces.
These surfaces should be smooth and free from
scoring or other damage.
• Rocker arm areas which contact the valve stems
and the sockets which contact the pushrods. These
areas should be smooth and free of damage and
wear.
• Rocker arm nuts.
• Pushrods for bending. Roll the pushrod on a flat
s u rfa ce to d e te rm in e if it is bent. R eplace if
necessary.
• Pushrod ends for scoring or roughness.
HYDRAULIC LIFTERS
Refer to GENERAL ENGINE MECHANICAL (SEC. 6A).
CYLINDER HEAD
R em ove or D isco n n ect (Figures 19 and 20)
Tool Required:
J 8062, Valve Spring Compressor
1. Valve keepers (20).
• Compress the springs with J 8062 (figure 20).
• Remove the keepers.
• Remove J 8062.
2. Cap (21), shield (22), seal (24), and dam per (25),
and spring (26) (intake valve).
3. Rotator (28), shield (22), seal (24), and dam per (25),
and spring (26) (exhaust valve).
4. O-ring seals (23).
5. Valves (27 and 29).
• Place the valves in a rack so they can be
returned to their original position at assembly.
Summary of Contents for 1989 Light Duty Truck
Page 1: ...vr V Light Duty Truck Unit Repair Manual...
Page 2: ......
Page 11: ...GENERAL INFORMATION OA 5 Figure 8 RV Models...
Page 13: ...GENERAL INFORMATION OA 7 Figure 11 ST Models...
Page 18: ......
Page 44: ......
Page 76: ...1B3 18 R 4 AIR CONDITIONING COMPRESSOR N...
Page 114: ......
Page 162: ......
Page 176: ...4B3 14 91 2 INCH RING GEAR...
Page 192: ...4B5 4 DANA REAR AXLES Figure 4 Spreading the Differential Case Figure 7 Removing the Ring Gear...
Page 218: ......
Page 220: ...4B6 2 12 INCH RING GEAR ROCKWELL F 04734 Figure 1 Rear Axle Components...
Page 229: ...12 INCH RING GEAR ROCKWELL 4B6 11 SPECIAL TOOLS Special Tools...
Page 230: ...4B6 12 12 INCH RING...
Page 240: ...4B7 10 LOCKING DIFFERENTIALS SPECIAL TOOLS Special Tools...
Page 260: ...4C2 6 93 4 INCH RING GEAR FRONT AXLE Figure 16 Removing the Pinion Inner Bearing...
Page 273: ...T TRUCK FRONT AXLE 4C3 3 F 05785 Figure 1 Axle Components...
Page 291: ...K TRUCK FRONT AXLE 4C4 3 Figure 1 Front Axle Com ponents K 15 25 Models...
Page 293: ...K TRUCK FRONT AXLE 4C4 5 Figure 3 Front Axle Com ponents K35 Models...
Page 318: ...C4 30 K TRUCK FBOHT AXLE...
Page 334: ......
Page 361: ...2 5 LITER L4 ENGINE 6A1 5 Figure 3 Cylinder Head Manifolds and Components...
Page 363: ...2 5 LITER L4 ENGINE 6A1 7 F 05715 Figure 5 Block and Components...
Page 395: ...2 8 LITER V 6 6A2 3 Figure 1 Engine Lubrication Diagram...
Page 396: ...6A2 4 2 8 LITER V 6 Figure 2 Engine Lubrication Diagram...
Page 424: ...6A2 32 2 8 LITER V 6...
Page 427: ...I 4 3 LITER V 6 6A3 3 Figure 1 Engine Lubrication Diagram B 07857...
Page 451: ...4 3 LITER V 6 6A3 27 SPECIFICATIONS ENGINE SPECIFICATIONS F 6344...
Page 457: ...4 8 LITER L6 6A4 3 Figure 2 Lubrication Diagram Front View...
Page 460: ...6A4 6 4 8 LITER L6 C 1 107 112 fK 108 3 109 165 129 B 05056 Figure 5 Block and Components...
Page 490: ...Ml...
Page 493: ...V8 ENGINE 6A5 3 Figure 1 Lubrication Diagram 5 0L and 5 7L Engines...
Page 494: ...6A5 4 V8 ENGINE Figure 2 Lubrication Diagram 5 0L and 5 7L Engines...
Page 530: ...6A5 40 V8 ENGINE Figure 81 Exhaust Manifold 7 4L Engines Figure 82 Water Pumps and Components...
Page 571: ...6 2 LITER DIESEL 6A7 35 Figure 58 Vacuum Pump Installed...
Page 576: ......
Page 582: ...6C1 6 MODEL 1MEF CARBURETOR Figure 9 Monojet Model 1MEF...
Page 604: ...6C2 6 MODEL M4MEF CARBURETOR Figure 9 Model M4MEF...
Page 640: ...6C4 8 MODEL 700 THROTTLE BODY...
Page 652: ...nmm...
Page 672: ......
Page 693: ...DISTRIBUTORS 6D5 13 Figure 27 Testing the Pickup Coil Figure 28 Testing the Ignition Coil...
Page 696: ......
Page 698: ...7A1 2 700 R4 AUTOMATIC TRANSMISSION Figure 1 Case and External Parts J H 0 0 5 3 7 0 0 R 4 R 2...
Page 745: ...700 R4 AUTOMATIC TRANSMISSION 7A1 49...
Page 762: ...7A2 2 400 475 AUTOMATIC TRANSMISSION Figure 1 Case and External Parts H H 0021 400 R 3...
Page 773: ...400 475 AUTOMATIC TRANSMISSION 7A2 13 Figure 29 Internal Parts H H 0 0 4 3 4 0 0 R 2...
Page 797: ...400 475 AUTOMATIC TRANSMISSION 7A2 37 Figure 93 Control Valve Assem bly...
Page 803: ...400 475 AUTOMATIC TRANSMISSION 7A2 43 Figure 104 Bushing Replacement Procedure...
Page 808: ...J c I i sal...
Page 838: ......
Page 840: ......
Page 842: ......
Page 850: ...7B1 12 HM 290 MANUAL TRANSMISSION J i t i a x V L...
Page 856: ...7B1 18 HM 290 MANUAL TRANSMISSION...
Page 892: ...7B1 54 HM 290 MANUAL TRANSMISSION Figure 93 Special Tools...
Page 897: ...HM 117 TRANSMISSION 7B2 5...
Page 901: ...HM 117 TRANSMISSION 7B2 9 B 05180 Figure 17 Installing the 1st and 2nd Synchronizer...
Page 912: ...20 HM...
Page 924: ...7B3 12 NEW PROCESS TRANSMISSION SPECIAL TOOLS...
Page 927: ...BORG WARNER TRANSMISSIONS 7B4 3 Figure 2 77 mm Transmission and Components...
Page 940: ...i ii iii m i in m i...
Page 944: ...7D1 4 TRANSFER CASE FO 5688 Figure 3 NP205 Transfer Case...
Page 952: ...7D1 12 TRANSFER CASE...
Page 963: ...NEW PROCESS 241 TRANSFER CASE 7D2 11 Figure 17 Oil Pump Pickup Screen Doweled Case Holes...
Page 964: ...7D2 12 NEW PROCESS 241 TRANSFER CASE Figure 18 NP 241 Transfer Case Cut Away...
Page 978: ......
Page 981: ...BORG WARNER 1370 TRANSFER CASE 7D4 3 J...
Page 992: ...7D4 14 BORG WARNER 1370 TRANSFER CASE Figure 26 Installing the Rear Output Yoke...
Page 993: ...BORG WARNER 1370 TRANSFER CASE 7D4 15 Figure 27 BW 1370 Transfer Case...
Page 997: ......
Page 998: ...X 8937...