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Engine Mechanical - 4.2L: Overhaul GMC Envoy II

Mechanical ~449 words

Cylinder Head Disassemble

Tools Required

  1. J 8062 Valve Spring Compressor. See «Special Tools»(ref-200396-S26818425802005102000000) .
  2. J 42037 Valve Spring Compressor Adapter. See «Special Tools»(ref-200396-S26818425802005102000000) .
  3. J 38820 Valve Stem Seal Remover/Installer. See «Special Tools»(ref-200396-S26818425802005102000000) .
  1. Remove the spark plugs.
  2. Use J 8062 and J 42037 to compress the valve spring. See «Special Tools»(ref-200396-S26818425802005102000000) .
  3. Remove the valve keys.
  4. Remove J 8062 and J 42037 . See «Special Tools»(ref-200396-S26818425802005102000000) .
  5. Remove the valve spring retainer and valve spring.
  6. Remove the valves.
  7. Use J 38820 to remove the valve seals. See «Special Tools»(ref-200396-S26818425802005102000000) .
  8. Inspect the water jacket plug, for leakage. Replace if necessary.
  9. Inspect the (inner) oil gallery plug, for leakage. Replace if necessary.
  10. Inspect the (end) oil gallery plugs, for leakage. Replace if necessary.

Cylinder Head Assemble

Tools Required

  1. J 8062 Valve Spring Compressor. See «Special Tools»(ref-200396-S26818425802005102000000) .
  2. J 42037 Valve Spring Compressor Adapter. See «Special Tools»(ref-200396-S26818425802005102000000) .
  3. J 38820 Valve Stem Seal Remover/Installer. See «Special Tools»(ref-200396-S26818425802005102000000) .
  1. Apply sealant GM P/N 12346004 (Canadian P/N 10953480) or equivalent to the threads.
  2. Install the (end) oil gallery plugs. Tighten: Tighten the oil gallery plugs to 38 N.m (28 lb ft).
  3. Apply sealant GM P/N 12346004 (Canadian P/N 10953480) or equivalent to the plugs.
  4. Install the (inner) oil gallery plugs.
  5. Apply sealant GM P/N 12346004 (Canadian P/N 10953480) or equivalent to the plug.
  6. Install the water jacket plug.
  7. Use J 38820 to install the valve seals. See «Special Tools»(ref-200396-S26818425802005102000000) . There is only one size valve seal.
  8. Install the valves. 0.075 mm (0.003 in) oversized valves are available if the valve guides needed to be reamed. Use the same (original size) valve seal.
  9. Install the valve spring and the valve spring retainer.
  10. Use J 8062 and J 42037 to compress the valve spring. See «Special Tools»(ref-200396-S26818425802005102000000) .
  11. Install the valve keys.
  12. Remove J 8062 and. See «Special Tools»(ref-200396-S26818425802005102000000) . J 42037 . See «Special Tools»(ref-200396-S26818425802005102000000) .
  13. Measure the valve installed height using a ruler. Measure from the base of the valve spring to the top of the valve. Refer to «Engine Mechanical Specifications»(ref-200396-S04002696082005102000000) .
  14. Install the remaining valves, springs, and other components.
  15. Install the spark plugs.

Service Prior to Assembly

Dirt will cause premature wear of the rebuilt engine. Clean all of the components. Use the proper tools in order to measure components when inspecting for excessive wear. Repair or replace the components that are not within the manufacturers specification. When components are reinstalled into an engine, return the components to their original location, position, and direction. During assembly, lubricate all of the moving parts with clean engine oil or engine assembly lubricant (unless otherwise specified). This will provide initial lubrication when the engine is first started.

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