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Home >> GMC >> 2011 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 93 (Engine Mechanical - 2.8L Or 3.0L - Repair Instructions - Off Vehicle (2 Of 5)) >> Cylinder Head Disassemble (LF1 or LFW) >> Disassembly Procedure

Disassembly Procedure

WARNING: This page is about a different car, the 2010 Cadillac SRX. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: Identifying Fuel Rail Bolts
    GM2202040Courtesy of GENERAL MOTORS CORP.
  1. Remove the fuel rail bolts (1).
    2. Fig 2: Identifying Fuel Rail & Injectors
    GM2225836Courtesy of GENERAL MOTORS CORP.
  2. Remove the fuel rail and injectors (1) as an assembly using the EN 49248:  remover.
    3. Fig 3: View Of Spark Plugs
    GM2004262Courtesy of GENERAL MOTORS CORP.
  3. Remove the spark plugs.
    4. Fig 4: View of Keeper & Special Tool EN 46119
    GM1977949Courtesy of GENERAL MOTORS CORP.
    NOTE: Ensure valve heads will not contact anything during the following step in order to avoid bending or damage.
  4. Using an appropriately sized deep socket and a plastic hammer, lightly tap on the valve spring retainer to loosen the valve keepers.
    5. Fig 5: Compressing Valve Spring Using Special Tools J 8062 & EN 46119
    GM1977952Courtesy of GENERAL MOTORS CORP.
    WARNING: Compressed valve springs have high tension against the valve spring compressor. Valve springs that are not properly compressed by or released from the valve spring compressor can be ejected from the valve spring compressor with intense force. Use care when compressing or releasing the valve spring with the valve spring compressor and when removing or installing the valve stem keys. Failing to use care may cause personal injury.
    CAUTION: Do not compress the valve springs to less than 24.0 mm (0.943 in). Contact between the valve spring retainer and the valve stem oil seal can cause potential valve stem oil seal damage.
  5. Compress the valve spring using the EN 8062:  compressor and the EN 46119:  adapter.
    6. Fig 6: View of Tool EN 46117 & Valve Keepers
    GM1977955Courtesy of GENERAL MOTORS CORP.
  6. Use the magnet of the EN 46117:  remover/installer in order to remove the valve keepers.
  7. Remove the valve spring compressor and the adapter.
    8. Fig 7: View Of Valve Spring & Retainer
    GM1977958Courtesy of GENERAL MOTORS CORP.
  8. Remove the valve spring retainer.
  9. Remove the valve spring.
    10. Fig 8: View of Oil Seal and Valve Guide
    GM1977960Courtesy of GENERAL MOTORS CORP.
  10. Remove the valve.
    11. Fig 9: View of Special Tool EN 46116 & Cylinder Head
    GM1977962Courtesy of GENERAL MOTORS CORP.
    NOTE: NEVER reuse a valve stem oil seal.
  11. Remove the valve stem oil seal using the EN 46116:  remover/installer and discard.
  12. Repeat these procedures for the remaining valves.
    13. Fig 10: View Of Cylinder Head Oil Gallery Expansion Plugs
    GM1977963Courtesy of GENERAL MOTORS CORP.
  13. Remove the cylinder head oil gallery expansion plugs.
    14. Fig 11: View Of Cylinder Head Coolant Threaded Plugs
    GM1977967Courtesy of GENERAL MOTORS CORP.
  14. Remove the cylinder head coolant threaded plugs.
    15. Fig 12: View Of Camshaft Position Actuator Oil Feed Check Valve
    GM1492615Courtesy of GENERAL MOTORS CORP.
  15. Inspect the camshaft position actuator oil feed check valves. Damaged, restricted or clogged check valves must be replaced. If check valves are OK, disregard remaining steps which detail replacing the check valves.
    16. Fig 13: Drilling Out Top Portion Of Check Valve
    GM2164009Courtesy of GENERAL MOTORS CORP.
  16. Place cylinder head on firm surface with check valves (1) facing up. Protect all cylinder head components and machined surfaces.
  17. Using drill bit EN-46122-3, drill out top portion of check valve to expose internal check ball.
    18. Fig 14: Identifying Check Ball & Check Ball Spring
    GM2164015Courtesy of GENERAL MOTORS CORP.
  18. Remove check ball (1) and check ball spring (2) from inside of check valve.
    19. Fig 15: View Of Drilling Check Valve Sleeve
    GM2164020Courtesy of GENERAL MOTORS CORP.
  19. Continue drilling remainder of check valve sleeve to a depth of approximately 19 mm (0.75 in) (a) by placing tape on drill bit as a depth gauge. It is not necessary or desirable to drill completely through the bottom of the check valve.
    20. Fig 16: View of Special Tool EN-46122--4
    GM2164025Courtesy of GENERAL MOTORS CORP.
  20. Lubricate tap EN-46122-4 with lubricant included in EN-46122:  remover/installer. Tap drilled out portion of check valve (1) remaining in cylinder head. Tap to full depth possible until tap bottoms out in head.
    21. Fig 17: Assembling Bolt, Nut, Washers & Collar EN-46122-2
    GM2164028Courtesy of GENERAL MOTORS CORP.
  21. Assemble bolt, nut, washers, and collar EN-46122-2 (1) as shown. Position collar with slightly-larger inside diameter DOWN toward the cylinder head.
  22. Screw bolt by hand fully down into threaded check valve sleeve, then lightly tighten nut against washer.
    23. Fig 18: View Of Check Valve Sleeve & Cylinder Head
    GM2164030Courtesy of GENERAL MOTORS CORP.
  23. Hold bolt with one wrench, and use another to tighten the nut until the check valve sleeve (1) is removed from the cylinder head.
  24. Clean check valve bore and related passages thoroughly to remove any drilling chips or other debris.
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