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Home >> Cadillac >> 2021 >> CT4 Sport, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 199 (Engine Mechanical - 3.6L (LF4) - Repair Instructions (4 Of 4)) >> Repair Instructions >> Engine Block Overhaul >> Cleaning and Inspection Procedure - Required

Cleaning and Inspection Procedure - Required

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NOTE:

The following cleaning and inspection and/or overhaul steps are ONLY to be performed as determined necessary based on the condition of the part being removed with the intention of reinstallation. The labor time to perform any of these steps is not included in the base labor time and if required would need to be documented and submitted as Other Labor Hours for warranty claim reimbursement. A description of the repairs performed must be documented in the technician correction comments.

Camshaft Cover

    NOTE:

    Do not submerge the camshaft cover in solvent.

  1. Clean the camshaft cover with solvent.
  2. Dry the camshaft cover with compressed air.
  3. GM5869158

    Inspect the camshaft cover (4) for the following conditions:

    1. Damage to the camshaft cover (4).

      If damage is found, replace the camshaft cover (4).

    2. Damage to the positive crankcase ventilation fitting (3).

      If damage is found, replace the positive crankcase ventilation fitting (3) using a suitable tool.

      3. NOTE:

      Replace only the components necessary to complete the repair.

    3. Damage to the spark plug shield seal (2).

      If damage is found, remove the affected spark plug shield seal (2) using a suitable tool, and install the NEW seal using DT-5590  Bearing and Seal Driver and EN-25254-A  Oil Seal Installer.

      4. NOTE:

      Replace only the components necessary to complete the repair.

    4. Damage to the camshaft cover bolt insulators (1).

      If damage is found, replace the affected camshaft cover bolt insulators (1) using a suitable tool.

Camshaft Cover

    NOTE:

    Do not submerge the camshaft cover in solvent.

  1. Clean the camshaft cover with solvent.
  2. Dry the camshaft cover with compressed air.
  3. GM5873171

    Inspect the camshaft cover (5) for the following conditions:

    1. Damage to the camshaft cover (5).

      If damage is found, replace the camshaft cover (5).

    2. Damage to the positive crankcase ventilation fitting (4).

      If damage is found, replace the positive crankcase ventilation fitting (4) using a suitable tool.

    3. Damage to the vacuum pump seal (3).
    4. If damage is found replace the vacuum pump seal (3) using a suitable tool.
      5. NOTE:

      Replace only the components necessary to complete the repair.

    5. Damage to the spark plug shield seal (2).

      If damage is found, remove the affected spark plug shield seal (2) using a suitable tool, and install the NEW seal using DT-5590  Bearing and Seal Driver and EN-25254-A  Oil Seal Installer.

      6. NOTE:

      Replace only the components necessary to complete the repair.

    6. Damage to the camshaft cover bolt insulators (1).

      If damage is found, replace the affected camshaft cover bolt insulators (1) using a suitable tool.

Crankshaft Balancer

  1. Clean the crankshaft balancer in solvent.
  2. Clean the belt grooves of all dirt or debris with a wire brush.
  3. Dry the crankshaft balancer with compressed air.
  4. GM5873748

    Inspect the crankshaft balancer for the following conditions:

    • Worn, grooved, or damaged hub seal surface.
    • A crankshaft balancer hub seal surface (2) with excessive scoring, grooves, rust or other damage must be replaced.
    • Minor imperfections on the hub seal surface (2) may be removed with polishing compound or fine grade emery cloth.
      • NOTE:

      In order for the belt to track properly, the belt grooves should be free of all dirt or debris.

    • Dirty or damaged belt grooves (1).
    • The balancer belt grooves (1) should be free of any nicks, gouges, or other damage that may not allow the belt to track properly.
    • Minor imperfections may be removed with a fine file.
    • Worn, chunking, or deteriorated rubber between the hub and pulley.

Crankshaft

  1. Clean the following components in solvent:
    • Crankshaft bearings
    • Connecting rod bearings
    • Crankshaft journals
    • Crank pin journals
    • Crankshaft oil passages
    • Crankshaft threaded holes
  2. Dry the following components with compressed air:
    • Crankshaft bearings
    • Connecting rod bearings
    • Crankshaft journals
    • Crankpin journals
    • Crankshaft oil passages
    • Crankshaft threaded holes
  3. GM1866878

    Perform the following visual inspections:

    • Inspect the crankshaft balancer bolt hole (1) for thread damage.
    • Inspect the crankshaft balancer mounting area (2) for damage.
    • Inspect the crankshaft keyway (3) for damage.
    • Inspect the oil pump drive flats (4) for damage.
    • Inspect the crankshaft main journals (5) for damage.
    • Inspect the crankshaft connecting rod journals (6) for damage.
    • Inspect the crankshaft oil passages (7) for obstructions.
    • Inspect the crankshaft main bearing thrust wall surfaces (8) for damage.
    • Inspect the crankshaft counterweights (9) for damage.
    • Inspect the crankshaft reluctor ring teeth (10) for damage.
    • Inspect the crankshaft rear main oil seal surface (11) for damage.
    • Inspect the crankshaft engine flex plate mounting surface (12) for damage.
    • Inspect the crankshaft pilot hole (13) for damage.
    • Inspect the crankshaft engine flex plate bolt holes (14) for thread damage.
  4. Repair or replace the crankshaft as necessary.

Crankshaft Bearing Inspection

  1. GM52051
    NOTE:
    • All connecting rod and main journal bearings that have been used in a running engine must be replaced. Never re-use the crankshaft or connecting rod bearings.
    • The following bearing wear conditions should be used to diagnose engine operating conditions or root cause of a condition.

    Inspect for fatigue indicated by craters or pockets. Flattened sections on the bearing halves also indicate fatigue.

  2. GM52053

    Inspect for excessive scoring or discoloration on both front and back of the bearing halves.

  3. Inspect the main bearings for dirt embedded into the bearing material.
  4. GM52056

    Inspect for improper seating indicated by bright, polished sections.

Crankshaft Measurement

  1. GM1866879

    Using a suitable fixture, support the crankshaft.

  2. GM1866880

    Install the EN-7872  Magnetic Base Dial Indicator.

  3. Measure the crankshaft runout using the EN-7872  Magnetic Base Dial Indicator. Engine Mechanical Specifications
  4. GM1866882

    Measure the crankshaft thrust wall width (1) for wear using an inside micrometer. Engine Mechanical Specifications

  5. Measure the crankshaft thrust wall surface (2) for runout using the EN-7872  Magnetic Base Dial Indicator. Engine Mechanical Specifications
  6. If the crankshaft journals are damaged or worn beyond specifications, the crankshaft may be ground 0.25 mm (0.010 in). There is only 1 size of oversized main bearings available for service.
  7. GM1866883

    Inspect the crankshaft main journals for undersize, using an outside micrometer.

  8. GM1866884

    Inspect the crankpins for undersize using an outside micrometer.

  9. Compare your measurements with those listed in the Engine Mechanical Specifications . If the crankpin journals are worn beyond the specifications, the crankshaft may be ground 0.25 mm (0.010 in). There is only 1 size of oversized connecting rod bearings available for service.
  10. GM53224

    Measure the main bearing and crankpin journals for out-of-round using the following procedure:

    1. Using an outside micrometer, measure the journal at the extreme front and rear locations on the journal. Call these points A and B.
    2. Measure the journal in 2 new locations exactly 90 degrees from the first points. Call these points C and D.
    3. Subtract A from C and B from D. The differences will indicate journal out-of-round.
    4. The out-of-round should not exceed 0.004 mm (0.00016 in) maximum.
    5. If the journals are worn beyond the specifications, the crankshaft may be ground 0.25 mm (0.010 in). There is only 1 size of oversized crankshaft and connecting rod bearings available for service.
  11. Measure the main bearing and crankpin journals for taper using the following procedure:
    1. Using an outside micrometer, measure the journal at the extreme front (A) and rear (B) of the journal parallel to the crankshaft centerline.
    2. Subtract the smallest from the largest measurement. The result will be the journal taper.
    3. If the main bearing journal taper exceeds 0.004 mm (0.00016 in), replace the crankshaft.
    4. If the journals are worn beyond the specifications, the crankshaft may be ground 0.25 mm (0.010 in). There is only 1 size of oversized crankshaft and connecting rod bearings available for service.

Oil Pan

    WARNING:

    Refer to Safety Glasses Warning .

  1. Clean the oil pan with solvent.
  2. Dry the oil pan with compressed air.
  3. GM5877485

    Inspect the oil pan (4) for the following conditions:

    1. Oil leakage at the engine oil level indicator switch (6).

      If damage is found, engine oil level indicator switch seal (6).

    2. Damage to the oil pan drain plug and oil pan drain plug seal (5).

      If damage is found, oil pan drain plug and oil pan drain plug seal (5).

    3. Exterior dents or damage to oil pan (4).

      If damage is found, replace the oil pan (4).

    4. Damage to the oil pump suction pipe (3).

      If damage is found, replace the oil pump suction pipe (3).

    5. Remove and DISCARD the oil pump suction pipe seal (2).

      Install the NEW oil pump suction pipe seal (2).

    6. Damage to the crankshaft oil deflector (1).

      If damage is found, replace the crankshaft oil deflector (1).

Engine Front Cover

  1. Clean the engine front cover with solvent.
  2. Dry the engine front cover with compressed air.
  3. GM5876892
    NOTE:

    Any damage to the engine front cover will require replacement of the engine front cover.

    Inspect the engine front cover for the following conditions:

    1. Gouges or damage to the engine front cover sealing surfaces to the engine block (8), oil pan (6), and camshaft covers (9)
    2. Damage and/or corrosion to the engine coolant passages (7).
    3. Damage to the crankshaft front oil seal bore (5).
    4. Damage to the engine front cover bolt holes (4).
    5. Damage to the camshaft position actuator valve oil seal bores (3).
      6. NOTE:

      Replace only the components necessary to complete the repair.

    6. Inspect water pump gasket (2) for leaks.

      If leakage is found, replace the water pump gasket (2).

      7. NOTE:

      Replace only the components necessary to complete the repair.

    7. Inspect the camshaft position sensors (1) for leaks or damage.
    8. If leakage or damage is found, replace the camshaft position sensors (1).

Engine Block

    NOTE:

    Ensure proper use of room temperature vulcanizing (RTV) sealant. Use of Room Temperature Vulcanizing (RTV) and Anaerobic Sealant

  1. Remove any old thread sealant, gasket material or sealant using the EN - 28410  Gasket Remover.
  2. Clean all the following areas with solvent:
    • Sealing surfaces
    • Cooling passages
    • Oil passages
    • Bearing journals
  3. Clean all threaded and through holes with solvent.
  4. Dry the engine block with compressed air.
  5. GM1210763

    Inspect the crankshaft bearings journals for damage or spun bearings. The crankshaft bearing journals are not repairable, if the crankshaft bearing journals are damaged the engine block must be replaced.

  6. Inspect the primary camshaft drive chain tensioner mounting surface on the engine block for burrs or any defects that would degrade the sealing of the NEW primary camshaft drive chain tensioner gasket.
  7. Inspect all sealing and mating surfaces for damage, repair or replace the engine block if necessary.
  8. Inspect all threaded and through holes for damage or excessive debris.
  9. Inspect all bolts for damage, if damaged replace with NEW bolts only.
  10. Check the cylinder condition. Some light vertical marks may be visible on the cylinder wall. In these areas, check that the honing marks are still visible in this marked area. If they are, the cylinder surface has not been compromised and the engine block can be used.
  11. Inspect the cylinder walls for cracks or damage. The cylinder sleeves are not serviced separately, if the cylinders are damaged the engine block must be replaced.
  12. Inspect the engine block for cracks. Do not repair any cracks. If cracks are found, the engine block must be replaced.
  13. Repair any damaged threaded holes. Thread Repair 
  14. GM1210767

    Ensure the engine block decks are clean and free of gasket material.

  15. Inspect the surface for any imperfections or scratches that could inhibit proper cylinder head gasket sealing.
  16. Place a straight-edge diagonally across the engine block deck face surface.
  17. Measure the clearance between the straight-edge and the engine block deck face using a feeler gauge at 4 points along the straight-edge.
  18. If the warpage is less than 0.05 mm (0.002 in), the engine block deck surface does not require resurfacing.
  19. If the warpage is between 0.05 - 0.20 mm (0.002 - 0.008 in) or any imperfections or scratches that could inhibit proper cylinder head gasket sealing are present, the engine block deck surface requires resurfacing.
  20. If resurfacing is required the maximum amount that can be removed is 0.25 mm (0.010 in).
  21. If the engine block deck surface requires more than 0.25 mm (0.010 in) material removal the block must be replaced.

Measuring Cylinder Bore Diameter

  1. GM4972

    Measure the cylinder bore diameter 37 mm (1.457 in) from the deck face using the EN - 8087  gauge.

    Compare your results with the Engine Mechanical Specifications . If the cylinder diameter exceeds the specifications, the engine block may be oversized to 0.25 mm (0.010 in). There is only one size of oversized pistons and rings available for service.

    Measuring Cylinder Bore Taper

    1. Measure the cylinder bore along the thrust surfaces, perpendicular to the crankshaft centerline, at 10 mm (0.397 in) below the deck surface and record your measurement.
    2. Measure the cylinder bore along the thrust surfaces, perpendicular to the crankshaft centerline, at 100 mm (3.976 in) below the deck surface and record your measurement.
    3. Calculate the difference between the 2 measurements. The result will be the cylinder taper.
    4. Compare your results with the Engine Mechanical Specifications . If the cylinders exceed the specifications, the engine block may be oversized to 0.25 mm (0.010 in). There is only one size of oversized pistons and rings available for service.

    Measuring Cylinder Bore Out-of-Round

    1. Measure both the thrust and non-thrust cylinder diameter at 10 mm (0.397 in) below the deck. Record your measurements.
    2. Calculate the difference between the 2 measurements. The result will indicate out-of-round at the upper end of the cylinder.
    3. Measure both the thrust and non-thrust cylinder diameter at 100 mm (3.976 in) below the deck surface. Record your measurements.
    4. Calculate the difference between the 2 measurements. The result will indicate out-of-round at the lower end of the cylinder.
    5. Compare your results with the Engine Mechanical Specifications . If the cylinders exceed these specifications, the engine block may be oversized to 0.25 mm (0.010 in). There is only one size of oversized pistons and rings available for service.
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