Cylinder Wall De-Glazing VW 2.0L Engines - Engine Builder Magazine
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Cylinder Wall De-Glazing VW 2.0L Engines

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For correct piston ring sealing during the engine rebuilding process, use the following information:

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• De-glaze cylinder walls using an 83 mm, 320 grit flexible ball-hone at 250-350 rpm.

• Lubricate cylinder walls with 10W-30 engine oil or honing oil, as recommended by the de-glazing ball-hone manufacturer.

• De-glaze the cylinders for approximately 20-45 seconds per cylinder.

Cross-hatch lines should intersect at an angle of approximately 45 degrees (see illustration):

• Too steep an angle will allow oil migration into cylinder, resulting in a thin oil film, which can cause ring and cylinder scuffing.

• Too flat an angle can hold excess oil, causing thicker oil films on which the piston ring rides up or “hydroplanes.”

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• The cross-hatch angle on the cylinder wall is determined by the vertical speed of the ball-hone:

• Too slow a vertical ball-hone speed will result in too flat a cross-hatch angle; if the vertical speed of the ball hone is too rapid, the cross-hatch angle will be too steep.

• Cylinder cleaning is the single most critical step after de-glazing of the cylinder walls.

• Pistons, rings and cylinder bores will tolerate slight variations in roughness, cross-hatch angles, etc., but engine components will not tolerate honing stone residue.

After de-glazing, clean cylinders thoroughly with warm or hot water and detergent. Rinse with hot water and lightly oil cylinder walls to prevent rust.

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Some or all of this information was provided by the Automotive
Parts Remanufacturers Association (APRA). For more information on
technical bulletins available through APRA call 703-968-2772 or visit www.AutoBulletins.com

 

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