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Tuesday, June 10, 2014

Duramax Diesel Head Gasket Assembly Cleaning

                              Duramax Diesel New Cylinder Head Gasket Assembly Cleaning 



Special Cleaning Requirements
For 2001-2006 vehicles produced with the first generation head gasket, special attention must be given to the cleaning of the engine block and cylinder head surfaces when servicing with a second generation gasket. The crimped areas (1) on the first generation gasket may, over time, allow corrosion buildup where they contact the block and cylinder head surfaces. The second generation gasket has raised ribs that seal at these crimped areas (1). A special cleaning procedure is required to ensure proper sealing.

Cleaning Procedure
1.Remove the old head gasket using service manual procedures. Save the gasket for reference until the repair is completed.
2.Place clean rags in the cylinder bores and push-rod openings in order to keep out debris.
3.Carefully clean the gasket sealing surface of large sealing or corrosion matter. When scraping, take care not to scratch or gouge the metal surfaces. Do not push the debris into oil, coolant, and combustion openings or bolt holes.
4.Inspect the gasket sealing surfaces for corrosion, especially in the areas that were in contact with the crimped tabs of the first generation head gasket. If corrosion is present, continue with the rest of the steps in this procedure for proper cleaning. If the sealing surface is sufficiently clean and smooth, use the revised torque specification listed towards the end of this bulletin and continue with published service manual procedures to complete the repair.
5.For surfaces that have corrosion or pitting, wrap a piece of flat steel (4"x 2" or larger) with 600 grit wet grade sand paper. Using Moisture Displacing Lubricant, wet sand the block surface to remove any remaining gasket material or corrosion. Do not use any paper coarser than 600 grit.
Notice
-Do not use any power type sanding devices.
-Do not use a wire brush or wheel to clean gasket surfaces.
-Do not use chemical cleaning agents on gasket surfaces.
6.Take care to keep the sanding block parallel to the block surface and evenly sand the sealing surface. Some areas of corrosion will still show a stain. Do not attempt to wet sand these areas down to a shiny metal surface.
7.Change the sanding paper when it becomes clogged. Carefully and frequently wipe the surface, using a clean cloth each time, to prevent sanding debris from building up and contaminating the oil and coolant cavities.
8.Clean the bolt threads and holes and remove the rags from the bore cavities and push-rod openings.
9.Repeat the above cleaning procedure on the Cylinder Head Gasket surface.
10.Clean the engine block and cylinder head gasket  surfaces with Brake Parts Cleaner, to remove any traces of oil or debris.
11.Using the revised head bolt torque specification below, reassemble the engine with NEW M-12 cylinder head gasket according to service manual procedures.


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