WebMachining recommendations vary depending on the type of equipment and tooling used, but Dura-Bond recommends using cutting oil and a spindle speed of 400 to 600 rpm when cutting valve seat counterbores in aluminum heads. When cutting cast iron heads, Dura-Bond recommends using no lubrication and a slower cutting speed of 100 to 250 rpm. WebMar 31, 2024 · I bore them for custom made, thick stainless steel shims until the cracks are gone. (Usually .090" to .150"). They crack because Cummins runs them too low from the factory. (Usually .009-.010") The liner then bounces on the counterbore, causing them to crack. (Mainly 2010-2012 with 152mm liners) I get them up to .014 protrusion. Truck …
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Lower Cylinder Bore Damage Caution for CAT 3400, C15, & C18 engines
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