PRE-RELEASE
Intake Manifold Cleaning and Inspection
| Intake Manifold Cleaning and Inspection |
| Upper Intake Manifold Cleaning Procedure |
| 1. |
Remove any remaining gasket and/or gasket material from the following:
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Throttle Body
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Intake manifold
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| 2. |
Clean the following intake manifold areas in solvent.
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Intake manifold gasket sealing areas
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Intake manifold passages
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Brake booster hose passage
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Evaporative emission (EVAP) solenoid passage
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Positive crankcase ventilation (PCV) vacuum hose passages
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Manifold absolute pressure (MAP) sensor passage
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| 3. |
Dry the upper intake manifold and throttle body with compressed air. |
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Warning
| Inspection Procedure |
| 1. |
Inspect the upper intake manifold for the following conditions:
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Damage to the intake manifold bolt bosses (2)
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Damage to the component bolt bosses and threads (1)
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Damage, debris or restrictions to the brake vacuum booster hose port (4)
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Damage, debris or restrictions to the PCV system hose ports (3)
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Damage, debris or restrictions to the EVAP system hose ports (5)
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Damage to the throttle body bolt holes
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| 2. |
Inspect the upper intake manifold for the following conditions:
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Gouges or damage to the upper intake manifold sealing surfaces (1)
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Damage to the gasket sealing surface (2) for the throttle body
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| 3. |
Inspect the upper intake manifold sealing surface for warpage.
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| 3.1. |
Locate a straight edge across the upper-to-lower intake manifold sealing surface.
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| 3.2. |
Insert a feeler gauge between the upper intake manifold and the straight edge. An upper intake manifold with warpage in excess of 0.50 mm (0.020 in) must be replaced.
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| 4. |
Repair or replace the upper intake manifold as necessary.
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| Lower Intake Manifold Cleaning Procedure |
| 1. |
Remove any remaining gasket and/or gasket material from the following:
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| • |
Upper-to-lower intake manifold sealing surface
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| • |
Cylinder head-to-lower intake manifold sealing surface
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| 2. |
Clean the following intake manifold areas in solvent.
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| • |
Intake manifold gasket sealing areas
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| • |
Intake manifold passages
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| 3. |
Dry the intake manifold with compressed air. |
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| Inspection Procedure |
| 1. |
Inspect the lower intake manifold for the following conditions:
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Damage, debris or restrictions to the lower intake manifold ports
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Damage to the fuel rail mounting bolt holes
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| • |
Damage to the fuel rail
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| 2. |
Inspect the lower intake manifold for the following conditions:
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| • |
Gouges or damage to the intake manifold sealing surfaces
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| • |
Damage to the lower intake manifold bolt bosses
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| • |
Damage to the fuel injector ports
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| 3. |
Inspect the lower intake manifold sealing surfaces for warpage.
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| 3.1. |
Locate a straight edge across the lower intake manifold sealing surfaces.
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| 3.2. |
Insert a feeler gauge between the lower intake manifold and the straight edge. A lower intake manifold with warpage in excess of 0.5 mm (0.020 in) must be replaced.
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| 4. |
Repair or replace the lower intake manifold as necessary.
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