Section 6A7 · Pages 707–738 (32 pages)

4.8 Liter L6

From the 1988 GMC Light Duty Truck Service Manual (R/V, P, G)

On-vehicle service for the 4.8L inline six. After the description and lubrication, procedures cover the rocker arm cover, rocker arms and pushrods, valve adjustment, valve stem seals and springs, pushrod cover, hydraulic lifters, intake and exhaust manifold, rocker arm studs and cylinder head, then the torsional damper and front seal, timing gear cover, oil pan and pump, rear main seal, checking valve timing, camshaft lobe lift and camshaft, pistons and rods, main bearings, crankshaft gear, oil filter bypass valve, crankshaft, flywheel, engine mountings and engine replacement.

Read this section free, starting at page 707

What this section covers

  • Engine description and lubrication
  • Rocker arms, pushrods, valve adjustment and pushrod cover
  • Intake and exhaust manifold, cylinder head
  • Torsional damper and timing gear cover
  • Oil pan, oil pump and rear main seal
  • Checking valve timing and camshaft replacement
  • Pistons, main bearings, crankshaft gear and crankshaft
  • Engine mountings and replacement, specifications and tools
Year
1988
Make
GMC
Vehicle
G Vans, Light Duty Trucks, P Forward Control, R/V Trucks, Trucks
Type
Service Manual
Models
R, V, G, P
Publication
X-8832
Pages
1,576

What’s inside

Service manual

  1. 0AGeneral Informationpp. 5–30
  2. 0BMaintenance and Lubricationpp. 31–56
  3. 1AHeating and Ventilationpp. 57–84
  4. 1BAir Conditioningpp. 85–160
  5. 2AFrame and Bumperspp. 161–184
  6. 2BSheet Metalpp. 185–214
  7. 3AFront End Alignmentpp. 215–222
  8. 3B1Steering Linkagepp. 223–238
  9. 3B3Power Steeringpp. 239–276
  10. 3B4Steering Columnpp. 277–326
  11. 3CFront Suspensionpp. 327–390
  12. 3DRear Suspensionpp. 391–402
  13. 3EWheels and Tirespp. 403–422
  14. 4APropeller Shaftpp. 423–436
  15. 4B1Rear Axlepp. 437–462
  16. 4CFront Driving Axlepp. 463–472
  17. 5AHydraulic Brakespp. 473–504
  18. 5A1Hydraulic Brake Booster Systemspp. 505–514
  19. 5A2Hydraulic Foundation Brakespp. 515–530
  20. 6Engine Section ContentsContents of section 6 and a guide to what each engine sub-section covers, from engine driveability and the individual engines to cooling, radiators, fuel, carburetors, diesel injection, engine electrical, emissions and exhaust.pp. 531–532
  21. 6AEngine, Driveability and Diagnosispp. 533–556
  22. 6A34.3 Liter V6pp. 557–588
  23. 6A4Small Block V8pp. 589–628
  24. 6A57.4 Liter V8pp. 629–664
  25. 6A66.2L Dieselpp. 665–706
  26. 6A74.8 Liter L6pp. 707–738
  27. 6B1Engine Coolingpp. 739–782
  28. 6B2Radiatorpp. 783–808
  29. 6CFuel Systempp. 809–828
  30. 6C1Carburetorspp. 829–866
  31. 6C2Diesel Fuel Injectionpp. 867–888
  32. 6DEngine Electricalpp. 889–970
  33. 6E1Carburetor Emissionspp. 971–1020
  34. 6E2Diesel Emissionspp. 1021–1086
  35. 6FExhaustpp. 1087–1096
  36. 6HVacuum Pumpspp. 1097–1104
  37. 7AAutomatic Transmissionpp. 1105–1184
  38. 7BManual Transmissionpp. 1185–1196
  39. 7CClutchpp. 1197–1212
  40. 7D1205 Transfer Casepp. 1213–1218
  41. 7D2208 Transfer Casepp. 1219–1228
  42. 8ACab Electricalpp. 1229–1276
  43. 8BChassis Electricalpp. 1277–1316
  44. 8CInstrument Panel and Gagespp. 1317–1334
  45. 9Accessoriespp. 1335–1372
  46. 10A1Doorspp. 1373–1454
  47. 10A2Seatspp. 1455–1490
  48. 10A3Glasspp. 1491–1504
  49. 10A4Interior Trimpp. 1505–1534
  50. 10A5End Gatepp. 1535–1554
  51. 10BCab and Body Maintenancepp. 1555–1576

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