Cleaning and Inspection Procedure - Required

WARNING: This page is about a different variant/trim than selected.

Courtesy of GENERAL MOTORS COMPANY

CAUTION:
The fuel injector must be cleaned with the proper cleaning equipment. DO NOT use abrasive cleaning methods, such as a metallic brush, to remove deposits. Cleaning an injector with improper tools will damage the fuel injector.

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.

Using a soft bristle non-metallic brush and top engine cleaner, remove any deposits from the high pressure diesel fuel injector nozzle tip (1) and the copper washer sealing area before installation.
Inspect the high pressure diesel fuel injector nozzle tip (1) for cracks, dents, or other damage.
Inspect the high pressure diesel fuel injector nozzle tip (1) for any signs of discoloration.
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Clean the camshaft housing (1) in solvent.
Inspect the camshaft housing (1) for damage or cracking. A cracked or damaged camshaft housing may:
1. Leak engine oil
2. Affect crankcase ventilation
3. Interfere with the camshafts
4. Allow water or condensation to enter the engine
Inspect the exterior of the camshaft housing (1) for the following conditions:
1. Damage to the camshaft housing bolt holes (2)
2. Damage to the camshaft housing injector bracket bolt holes (3)
3. Damage to the positive crankcase ventilation valve (4).
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Inspect the interior of the camshaft housing for the following conditions:
1. Inspect the camshaft housing for cracks, casting imperfections, or damage.
2. Inspect the camshaft housing seal locations (2) for cracks or damage.
3. Inspect the crankcase ventilation oil separator cover (1) for cracks or damage.
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Clean all threads on the compressor air intake turbocharger, if necessary.
Clean all sealing surfaces.
Inspect the wastegate regulator mechanism (1) for functionality.
Inspect the turbine blades for damage or foreign material.
Inspect the turbine blade shaft for excessive radial and axial end play.
Inspect the compressor air intake turbocharger for cracks or other damage.
Inspect the compressor air intake turbocharger mating surface for flatness.