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Home >> Cadillac >> 2021 >> CT4 Sport, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 170 (Engine Mechanical - 2.7L (L3B) - Repair Instructions (2 Of 3)) >> Repair Instructions >> Cylinder Head Replacement >> Cleaning and Inspection Procedure - Required

Cleaning and Inspection Procedure - Required

WARNING: This page is about a different car, the 2022 Cadillac CT4. However, it is still accessible from the selected car via links, so may be relevant.
  1. GM5044133

    Clean the crankshaft balancer with soap and water.

    2. WARNING:

    Refer to Safety Glasses and Compressed Air Warning

  2. Dry the crankshaft balancer with compressed air.
    3. NOTE:

    A crankshaft balancer hub seal surface (2) with excessive scoring, grooves, rust or other damage must be replaced.

  4. Inspect the crankshaft balancer for the following:
    1. Worn or damaged hub-to-crankshaft surface (1)
    2. Worn, grooved or damaged hub seal surface (2)
    3. Worn, chunking or deteriorated rubber between the hub and pulley (3)
    4. Damaged drive belt ribs (4)
    5. Damaged webs (5)
  5. If any of the above conditions exist, replace the crankshaft balancer.
  6. GM5896859

    Clean the crankshaft sprocket (1) in solvent.

    7. WARNING:

    Refer to Safety Glasses and Compressed Air Warning

  7. Dry the crankshaft sprocket with compressed air.
  8. Inspect the crankshaft sprocket for grooves, excessive wear, or chipping.
  9. Inspect the crankshaft sprocket for damage to the teeth (2)
  10. If any of the above conditions exist, replace the crankshaft sprocket.
  11. GM5064714

    Clean the fuel injection fuel rail passages and connection ports of dirt, debris or blockage.

  12. Clean the fuel injection fuel rail (1) in solvent.
    13. WARNING:

    Refer to Safety Glasses and Compressed Air Warning

  13. Dry the fuel injection fuel rail with compressed air.
  14. Inspect the fuel injection fuel rail for the following conditions:
    1. Damage, debris or restrictions to the fuel rail
    2. Damage, debris or restrictions to the fuel injector ports
    3. Damage to the bolt holes
    4. Damage to the threads on the feed pipe bore
    5. Damage to the threads in the fuel pressure sensor bore
  15. If any of the above conditions exist, replace the fuel injection fuel rail.
  16. GM2918356
    NOTE:

    The fuel injector seals must fit properly in the relative groove. Overlapping of the fuel injector seals with the external surface of the injector must be avoided. Avoid handling the injector tip seals as much as possible to avoid damage.

    Check both of the fuel injector combustion seals on each fuel injector for correct seat:

    • The seal must not be too large, buckled, or corrugated (1)
    • The seal must be fixed tight and accurate (2)
  17. GM5896300
    NOTE:

    Do not soak or submerge the fuel pump in solvent.

    Clean the fuel pump (2) and valve lifter follower (5).

    18. WARNING:

    Refer to Safety Glasses and Compressed Air Warning

  18. Dry the fuel pump and valve lifter follower with compressed air.
  19. Inspect the fuel pump for the following conditions:
    1. Damage to the connection ports (1)
    2. Damage to the electrical connector (2)
    3. Damage to the sealing surface (3)
    4. Damage to or a bent or binding plunger (7)
    5. Damage to the mounting holes (8)
  20. Inspect the valve lifter follower for the following conditions:
    1. A scored or worn fuel pump contact surface (4)
    2. A severely scuffed or worn body (5)
    3. Binding or roughness of the roller (6)
  21. If any of the above conditions exist, replace the fuel pump and/or the valve lifter follower.
  22. GM5863014

    Clean the timing chain (1) in solvent.

    23. WARNING:

    Refer to Safety Glasses and Compressed Air Warning

  23. Dry the timing chain with compressed air.
  24. Inspect the timing chain for signs of excessive wear, chipping, or seizure of the timing chain links.
  25. Replace the timing chain if damaged.
  26. GM5897283

    Clean out debris from the bolt holes.

  27. Clean the timing chain guide (1) in solvent.
    28. WARNING:

    Refer to Safety Glasses and Compressed Air Warning

  28. Dry the timing chain guide with compressed air.
    1. Damage, cracking or wear to the timing chain guide (1)
    2. Damage or wear to the bolt holes (2)
    3. Wear exceeding 1.12 mm (0.045 in) of depth on the chain guide surface (3)
  29. If any of the above conditions exist, replace the timing chain guide.
  30. GM5897284

    Clean out debris from the bolt holes.

  31. Clean the timing chain guide (1) in solvent.
    32. WARNING:

    Refer to Safety Glasses and Compressed Air Warning

  32. Dry the timing chain guide with compressed air.
    1. Damage, cracking or wear to the timing chain guide (1)
    2. Damage or wear to the bolt holes (2)
    3. Wear exceeding 1.12 mm (0.045 in) of depth on the chain guide surface (3)
  33. If any of the above conditions exist, replace the timing chain guide.
  34. GM5896863

    Clean the timing chain tensioner (1) in solvent.

  35. Clean out debris from the bolt holes and around the plunger.
    36. WARNING:

    Refer to Safety Glasses and Compressed Air Warning

  36. Dry the timing chain tensioner with compressed air.
  37. Inspect the timing chain tensioner for the following conditions:
    1. Damage or wear to the body (1)
    2. Damage or wear to the bolt holes (2)
    3. Damage or wear to the plunger (3)
  38. If any of the above conditions exist, replace the timing chain tensioner.
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