Disassembly; Tools And Shop Equipment; Accessory Removal; Cleaning - Chevrolet 1988 Light Duty Truck Repair Manual

6A4-4 4.8 LITER L6
1. Oil Cap
2. C lip
3. Screw
4. R einforcem ent
5. PCV Valve
6. Seal
7. R ocker Arm Cover
8. G asket
9. G rom m et
10. C o n n e cto r
11. N ut
12. Ball
13. R ocker Arm
14. R ocker Arm Stud
15. Valve Key
16. O-ring Seal
17. R otator
18. Shield
19. Seal
20. Valve Spring

TOOLS AND SHOP EQUIPMENT

A clean, well lit work area should be available. Other
necessary aids include: A suitable parts cleaning tank,
compressed air supply, trays to keep parts and fasteners
organized, and an adequate set of hand tools.
An approved engine repair stand will aid the work and
help prevent personal injury or damage to engine
compartments.
Special tools are illustrated throughout this section, and
are listed at its end. These tools (or their equivalents) are
specially designed to quickly and safely accomplish the
operations for which they are intended. The use of these
tools will also m inimize possible damage to engine
components.
Some precision measuring tools are required for
insp ectio n of ce rta in c ritic a l com ponents. Torque
wrenches will be necessary for correct assembly of
various parts.

ACCESSORY REMOVAL

This manual assumes that the engine accessories have
been removed. These accessories may include one or
more of the following:
Hydraulic Pump
Generator
Distributor

DISASSEMBLY

21. Pushrod
22. Bolt
23. Bolt
24. W asher
25. Bracket
26. C ylin de r Head
27. Gasket
28. Stud
29. W asher
30. N ut
31. Intake M anifold
32. N ut
33. Head G asket
34. Clam p
35. Bolt
36. Gasket
37. Exhaust M anifold
38. Stud
39. Bolt
40. W asher
Figure 3— Cylinder Head, Manifolds, and Com ponents
AIR Pump
Cooling Fan
Carburetor
41. Stud
42. Intake Valve
43. Exhaust Valve
44. S w itch
45. Plug
46. C lam p
47. Hose
48. N ipple
49. Gasket
50. H ousing
51. Bolt
52. T he rm o stat
53. G asket
54. W ater O utlet
55. B olt
56. Stud
57. W asher
58. Bracket
59. Stud
It is beyond the score of this manual to detail the many
different accessory installations. Refer to the proper Truck
Service Manual for this information.
Diagrams of emission and vacuum hose routings,
wiring harness routings, accessory drive belt layout, etc.,
should be made before removing accessories.

CLEANING

Remove the engine accessories before cleaning to
provide better access to engine exterior surfaces. After
removing the carburetor, distributor, fuel pump, oil filter,
etc., cover the openings with tape to prevent the entry of
water, solvent, and dirt.
Methods used to clean the engine will depend on the
aids which are available. Steam cleaning, pressure
washing, or solvent cleaning are some acceptable
methods. Allow the engine to dry before beginning the
work.
It is important that the engine be as clean as possible to
p re v e n t d irt from e n te rin g c r itic a l a re as d u rin g
disassembly.

PARTS IDENTIFICATION

Refer to figures 3 through 6.
B-07995