COOLER GP-EXHAUST (NRS) 4493068 - Caterpillar

"Cylinder Liners Can Now Be Reconditioned Automatically" on Pages 2 and 3 of the June 22, 1981 Service Magazine.The reference article tells about the use of Flex-Hones with an FT1528 Liner Honing Machine, and an FT1524 Tub Assembly for cylinder liner reconditioning. Some of the information given in the article is not complete, and more information is needed. Make a note on the article to see this article, and use the information that follows for reference.
The information in the first paragraph of the reference article about the crosshatch pattern (design) made by the Flex-Hone, and Illustration 2 are not correct. The Flex-Hone is a flexible brush with abrasive tips. While this gives a light abrasive action, it will not make a consistent (regular) crosshatch pattern, and the scratches are not as deep as those made by a standard hard-face hone. The Flex-Hone will make only light scratches on the liner surface, in a random (not regular) pattern.
The Flex-Hone will remove varnish or light rust from the liner surface, but will not remove taper or the step caused by piston ring wear. It is an acceptable method of reconditioning the liner surface.
During operation of a Flex-Hone, use light petroleum-base solvent, kerosene, or diesel fuel as a coolant. After use of a Flex-Hone, the liner must be cleaned with a nylon brush and a solution of detergent and hot water. When thoroughly clean, the liner must be treated (put on a layer) with rust preventive material. It is very important that both the coolant and the solution used to clean the liner be kept clean and free of foreign material. Any dirt or foreign material in the crosshatch scratches after the liner is cleaned can cause damage.