SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 719 (ENGINE MECHANICAL - 3.8L (UNIT REPAIR))REPAIR INSTRUCTIONSCYLINDER HEAD DISASSEMBLE
1999 GMC Forward Control 5.7 R, Automatic

Cylinder Head Disassemble

1999 GMC Forward Control 5.7 R, AutomaticSECTION Cylinder Head Disassemble
WARNING: This page is about a different car, the 2002 Pontiac Grand Prix. However, it is still accessible from the selected car via links, so may be relevant.

Tools Required 

J 38606  Valve Spring Compressor

Important:  During disassembly, ensure the valve train components are kept together and identified so they can be reinstalled in their original locations and with the same mating surfaces as when removed.

  1. Use J 38606  to compress the valve spring.
    Fig 1: Compress Valve Spring Using J 38606
    G01703608Courtesy of GENERAL MOTORS CORP.
  2. Remove the valve keys.
  3. Remove the valve cap and spring.
  4. Remove the valve stem oil seal by prying up on the bottom.
    Fig 2: Remove Valve Keys, Cap, Spring & Valve Stem Oil Seal
    G01703609Courtesy 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.