|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.|
|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.|
Tuesday, June 10, 2014
Duramax Diesel Head Gasket Assembly Cleaning
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