Section 6A1 · Pages 375–410 (36 pages)

2.5 Liter L4 Engine

From the 1990 GMC Light Duty Truck Unit Repair Manual

Unit repair (bench overhaul) of the GM 2.5L inline four: overhead valves, cast-iron block and head, five main bearings with thrust at the rear, a gear-driven camshaft on three bearings and roller hydraulic lifters. Disassembly runs from accessories, manifolds, thermostat housing and water pump through the valve train, head, pulley hub, oil pan, oil pump driveshaft, front cover, pistons, flywheel and crankshaft. Cleaning, inspection and repair covers the block and cylinder bores, piston selection, manifolds, camshaft and bearings, front cover, pump, valve train, head and crankshaft, followed by step-by-step assembly and engine set-up and testing.

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What this section covers

  • Engine description and lubrication
  • Tools, cleaning and parts identification
  • Engine disassembly
  • Rear oil seal and main bearings without removing crankshaft
  • Block, cylinder bores and piston selection
  • Camshaft, bearings and valve train inspection
  • Engine assembly
  • Engine set-up and testing, specifications and tools
Year
1990
Make
GMC
Vehicle
C/K Trucks, G Vans, Light Duty Trucks, M Vans (Astro/Safari), P Forward Control, R/V Trucks, S/T Trucks, Trucks
Type
Overhaul & Unit Repair
Publication
X-9037
Pages
1,052

What’s inside

Unit repair manual

  1. 0AGeneral Informationpp. 7–20
  2. 1B1A-6 Air Conditioning Compressorpp. 21–44
  3. 1B2V5 Air Conditioning Compressorpp. 45–58
  4. 1B3R-4 Air Conditioning Compressorpp. 59–76
  5. 1B4HR-6 Air Conditioning Compressorpp. 77–94
  6. 1B5SD-709 Air Conditioning Compressorpp. 95–102
  7. 3B2Manual Steering Gearpp. 103–114
  8. 3B3Power Steeringpp. 115–134
  9. 4B17 1/2- and 7 5/8-Inch Ring Gear Rear Axlespp. 135–146
  10. 4B28 1/2-Inch Ring Gear Rear Axlepp. 147–160
  11. 4B39 1/2-Inch Ring Gear Rear Axlepp. 161–174
  12. 4B410 1/2-Inch Ring Gear Rear Axlepp. 175–186
  13. 4B5Dana Rear Axlespp. 187–216
  14. 4B612-Inch Ring Gear (Rockwell) Rear Axlepp. 217–228
  15. 4B7Locking Differentialpp. 229–238
  16. 4C18 1/2-Inch Ring Gear Front Axlepp. 239–252
  17. 4C29 3/4-Inch Ring Gear (Dana) Front Axlepp. 253–268
  18. 4C3T Truck Front Axlepp. 269–286
  19. 4C4K Truck Front Axlepp. 287–316
  20. 4C5L Van Front Axlepp. 317–336
  21. 5Brakespp. 337–352
  22. 6AGeneral Engine Mechanicalpp. 353–374
  23. 6A12.5 Liter L4 Enginepp. 375–410
  24. 6A22.8 Liter V6 Enginepp. 411–442
  25. 6A34.3 Liter V6 Enginepp. 443–472
  26. 6A44.8 Liter L6 Enginepp. 473–508
  27. 6A5V8 Engine (5.0, 5.7 and 7.4 Liter)pp. 509–554
  28. 6A76.2 Liter Diesel Enginepp. 555–594
  29. 6C1Model 1MEF Carburetorpp. 595–616
  30. 6C2Model M4MEF Carburetorpp. 617–642
  31. 6C3Model 220 Throttle Bodypp. 643–650
  32. 6C4Model 700 Throttle Bodypp. 651–658
  33. 6D1Series Generatorspp. 659–670
  34. 6D2CS-144 Generatorpp. 671–678
  35. 6D3SD Starting Motorspp. 679–690
  36. 6D4PG-200 (PMGR) Starting Motorpp. 691–698
  37. 6D5Distributorspp. 699–712
  38. 7AHydra-matic 4L60 Automatic Transmissionpp. 713–792
  39. 7AHydra-matic 3L80/3L80-HD Automatic Transmissionpp. 793–848
  40. 7AHydra-matic 3L30 Automatic Transmissionpp. 849–890
  41. 7B1Hydra-matic 5LM60 Manual Transmissionpp. 891–938
  42. 7B2HM-117 Manual Transmissionpp. 939–958
  43. 7B3New Process Transmissionpp. 959–970
  44. 7B4Borg Warner Transmissionspp. 971–986
  45. 7D1New Process 205 Transfer Casepp. 987–998
  46. 7D2New Process 241 Transfer Casepp. 999–1012
  47. 7D3New Process 231 Transfer Casepp. 1013–1024
  48. 7D4Borg-Warner 1370 Transfer Casepp. 1025–1040
  49. 7D5Borg-Warner 4472 Transfer Casepp. 1041–1052

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