SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 684 (ENGINE MECHANICAL - 3.8L)REPAIR INSTRUCTIONSON-VEHICLE REPAIR INSTRUCTIONSENGINE FRONT COVER REPLACEMENTREMOVAL PROCEDURE
1999 GMC Forward Control 5.7 R, Automatic

Removal Procedure

1999 GMC Forward Control 5.7 R, AutomaticSECTION Removal Procedure
WARNING: This page is about a different car, the 2003 Pontiac Grand Prix. However, it is still accessible from the selected car via links, so may be relevant.
  1. Disconnect the negative battery cable. Refer to BATTERY NEGATIVE CABLE DISCONNECT/CONNECT PROCEDURE in Battery.
  2. Raise and support the vehicle. Refer to JACKING AND LIFTING in General Information.
  3. Drain the engine oil. Refer to ENGINE OIL AND OIL FILTER REPLACEMENT  .
  4. Drain the cooling system. Refer to DRAINING AND FILLING COOLING SYSTEM in Engine Cooling.
  5. Lower the vehicle.
  6. Loosen the water pump pulley bolts.
  7. Remove the drive belt tensioner. Refer to DRIVE BELT TENSIONER REPLACEMENT  .
  8. Remove the water pump pulley.
  9. Remove the power steering pump bolts and reposition the pump.
  10. Raise the vehicle.
  11. Remove the crankshaft balancer. Refer to CRANKSHAFT BALANCER REPLACEMENT  .
    Fig 1: Removing Power Steering Pump And Bolts
    G02083602Courtesy of GENERAL MOTORS CORP.

    Important:  Be careful not to damage the crankshaft.

  12. Pry out the crankshaft front oil seal with a flat-bladed tool such as a large screwdriver. Use care to avoid damaging the crankshaft front oil seal bore or the crankshaft front oil seal contact surfaces.
  13. Disconnect the electrical connectors from the following:
    • Camshaft position (CMP) sensor
    • Crankshaft position (CKP) sensor
    • Oil pressure sensor
    Fig 2: Removing Crankshaft Front Oil Seal
    G02083603Courtesy of GENERAL MOTORS CORP.
  14. Remove the crankshaft position sensor shield.
  15. Remove the radiator outlet hose from the water pump. Refer to RADIATOR HOSE REPLACEMENT - OUTLET (3.1 L) or RADIATOR HOSE REPLACEMENT - OUTLET (3.8L) in Engine Cooling.
  16. Lower the vehicle.
  17. Install the engine support fixture. Refer to ENGINE SUPPORT FIXTURE  .
  18. Raise the vehicle.
    Fig 3: Removing Crankshaft Position Sensor Shield
    G02083604Courtesy of GENERAL MOTORS CORP.

    Important:  The oil pan can be dropped slightly for engine front cover clearance if all pan bolts are loosened and the oil level sensor is removed.

  19. Remove the oil filter.
  20. Remove the engine mount bracket for oil pan access. Refer to ENGINE MOUNT AND BRACKET REPLACEMENT  .
  21. Disconnect the oil level sensor electrical connector.
  22. Remove the oil level sensor.
  23. Remove the oil pan-to-engine front cover bolts.
  24. Loosen the remaining oil pan bolts to gain access for the engine front cover removal. DO NOT remove the remaining oil pan bolts.
    Fig 4: Removing Oil Filter
    G02083605Courtesy of GENERAL MOTORS CORP.
  25. Remove the crankshaft position sensor.
    Fig 5: Removing Crankshaft Position Sensor
    G02083606Courtesy of GENERAL MOTORS CORP.
  26. Remove the engine front cover bolts.
  27. Remove the engine front cover with the oil filter adapter as one assembly.
    Fig 6: Removing Engine Front Cover
    G02083607Courtesy of GENERAL MOTORS CORP.
  28. Remove the engine front cover gasket.
    Fig 7: Removing Engine Front Cover Gasket
    G02083608Courtesy of GENERAL MOTORS CORP.
  29. If replacing the engine front cover, remove the oil filter adapter and pressure relief valve from the engine front cover.
    Fig 8: Removing Oil Filter Adapter And Pressure Relief Valve
    G02083609Courtesy of GENERAL MOTORS CORP.
  30. If replacing the engine front cover, remove the water pump from the engine front cover.
    Fig 9: Removing Water Pump From Engine Front Cover
    G02083610Courtesy of GENERAL MOTORS CORP.
  31. If replacing the engine front cover, remove the oil pump cover and gear set from the engine front cover. Refer to OIL PUMP COVER AND GEAR SET REPLACEMENT  .
  32. Inspect the oil pump cover and gear set. Refer to OIL PUMP CLEANING AND INSPECTION  .
    Fig 10: Removing Oil Pump Cover And Gear Set From Engine Front Cover
    G02083611Courtesy of GENERAL MOTORS CORP.
  33. If replacing the engine front cover, remove the camshaft position sensor from the engine front cover.
  34. Inspect the timing chain for overall in and out movement. Maximum movement is 25.4 mm (1 in). Refer to TIMING CHAIN AND SPROCKETS CLEANING AND INSPECTION (L36)  or TIMING CHAIN AND SPROCKETS CLEANING AND INSPECTION (L67)  .
  35. Inspect the sprockets for wear.
  36. Inspect the oil pan gasket. Replace the oil pan gasket if necessary.
  37. Clean the engine front cover mating surfaces.
    Fig 11: Removing Camshaft Position Sensor From Engine Front Cover
    G02083612Courtesy of GENERAL MOTORS CORP.
RENDER: 1.0x

NO RELATED

Recommended Tools & Savings

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Affiliate disclosure: We may earn a commission at no extra cost to you.

Shop Manual-Ready ToolsFree Quote CheckQuote Shield Pro

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.