Section 6A5 · Pages 647–676 (30 pages)

7.4 Liter V8

From the 1991 GMC Light Duty Truck Service Manual (Suburban, R/V 3500, P)

On-vehicle service for the 7.4L big-block V8: a 90-degree overhead-valve engine with cast-iron block and heads, five main bearings with thrust at the rear, a chain-driven camshaft on five bearings, hydraulic lifters and ball-type rocker arms. After the description and lubrication, procedures cover the rocker arm cover, rocker arms and pushrods, valve stem seals and springs, intake manifold, lifters, exhaust manifold and cylinder head, the torsional damper and front seal, front cover, oil pan and pump, rear main seal, measuring camshaft lobe lift, camshaft, pistons and rods, main bearings, crankshaft, flywheel, engine mountings and engine replacement.

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What this section covers

  • Engine description and lubrication
  • Rocker arms, pushrods, valve stem seals and springs
  • Intake and exhaust manifolds, lifters and cylinder heads
  • Torsional damper, front seal and front cover
  • Oil pan, oil pump and rear main seal
  • Camshaft lobe lift and camshaft replacement
  • Pistons, main bearings and crankshaft
  • Engine mountings and replacement, specifications and tools
Year
1991
Make
GMC
Vehicle
Light Duty Trucks, P Forward Control, R/V Trucks, Trucks
Type
Service Manual
Models
Suburban & Utility, R/V 3500, P30/3500
Publication
X-9132
Pages
1,593

What’s inside

Service manual

  1. 0AGeneral Informationpp. 15–44
  2. 0BMaintenance and Lubricationpp. 45–96
  3. 1AHeating and Ventilationpp. 97–112
  4. 1BAir Conditioningpp. 113–178
  5. 2AFrame and Bumperspp. 179–196
  6. 2BSheet Metal and Fiberglasspp. 197–224
  7. 3AFront End Alignmentpp. 225–232
  8. 3B1Power Steeringpp. 233–264
  9. 3B3Steering Linkagepp. 265–278
  10. 3CFront Suspension and Axlepp. 279–338
  11. 3DRear Suspensionpp. 339–348
  12. 3EWheels and Tirespp. 349–366
  13. 3F1Steering Column: Standardpp. 367–388
  14. 3F2Steering Column: Tiltpp. 389–416
  15. 4APropeller Shaftpp. 417–434
  16. 4B1Rear Axlepp. 435–462
  17. 4CFront Driving Axlepp. 463–470
  18. 5AHydraulic Brakespp. 471–494
  19. 5A1Hydraulic Brake Booster Systemspp. 495–504
  20. 5A2Hydraulic Foundation Brakespp. 505–520
  21. 5A3Rear Wheel Antilock Brake Systempp. 521–548
  22. 5CParking Brakespp. 549–562
  23. 6AEngine, Driveability and Diagnosispp. 563–582
  24. 6A34.3 Liter V6pp. 583–612
  25. 6A45.0L and 5.7L V8pp. 613–646
  26. 6A57.4 Liter V8pp. 647–676
  27. 6A66.2L Dieselpp. 677–710
  28. 6B1Engine Coolingpp. 711–768
  29. 6CFuel Systempp. 769–786
  30. 6C2Diesel Fuel Injectionpp. 787–812
  31. 6D1Batterypp. 813–822
  32. 6D2Cranking Systempp. 823–834
  33. 6D3Charging Systempp. 835–846
  34. 6D4Ignition Systempp. 847–864
  35. 6D5Engine Block Heaterspp. 865–870
  36. 6D6Diesel Glow Plug Electrical Systempp. 871–878
  37. 6D7Engine Wiringpp. 879–896
  38. 6E2Diesel Emissions: 6.2L Diesel Enginepp. 897–966
  39. 6FExhaustpp. 967–982
  40. 6HVacuum Pumpspp. 983–988
  41. 7AAutomatic Transmissionpp. 989–994
  42. 7A14L60 Automatic Transmissionpp. 995–1076
  43. 7A24L80E Automatic Transmissionpp. 1077–1162
  44. 7A4Electronic Transmission Controlpp. 1163–1258
  45. 7BManual Transmissionpp. 1259–1266
  46. 7CClutchpp. 1267–1282
  47. 7DTransfer Casepp. 1283–1296
  48. 8ACab Electricalpp. 1297–1320
  49. 8BLighting Systemspp. 1321–1378
  50. 8CInstrument Panel and Gagespp. 1379–1396
  51. 8DChassis Electricalpp. 1397–1416
  52. 8EWindshield Wiper/Washer Systempp. 1417–1422
  53. 9Accessoriespp. 1423–1468
  54. 10A1Doorspp. 1469–1502
  55. 10A2Seatspp. 1503–1528
  56. 10A3Glasspp. 1529–1536
  57. 10A4Interior Trimpp. 1537–1552
  58. 10A5End Gatepp. 1553–1570
  59. 10BCab and Body Maintenancepp. 1571–1593

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