COVER AS 4505252 - Caterpillar

Illustration 177 g03390704
Illustration 178 g03390736
No cracks are permitted.
DO NOT USE AGAIN
Illustration 179 g01201914
The piston has a crack in the web area. There is also damage near the pin bore of the piston.
DO NOT USE AGAIN Damage from Improper Handling
Illustration 180 g02840163
Top skirt damage. This piston can be reused after salvage operation and reinspect piston.
USE AGAIN
Illustration 181 g02776937
Small ding in crown. This piston can be reused after salvage operation and inspection.
USE AGAIN
Illustration 182 g02817941
Small dent in very edge of crown.
USE AGAIN
Illustration 183 g02776936
Small dent in crown. This piston can be reused after salvage operation and inspection.
USE AGAIN
Illustration 184 g02783251
Large dent in very edge of crown.
DO NOT USE AGAIN
Illustration 185 g02783259
Small dent in very edge of crown.
USE AGAIN
Illustration 186 g02817940
Small dent in very edge of crown.
USE AGAIN
Illustration 187 g02821959
Nick in the pin bore.
DO NOT USE AGAINReconditioning Procedure
There are several methods for reconditioning minor damage to the piston crown and the piston skirt. Use the method for cleaning that is least aggressive during the process for reconditioning of the piston.A depression results when a part is scratched, nicked, or dented. The scratch, the nick, or the dent can also result in an area that is raised.
Illustration 188 g02882814
Carefully remove the raised metal area that is caused by nicks, dents, and scratches. Illustration 177 shows examples of the various types of damage to the piston. In order for the piston to be reused, the piston must be cleaned and the area of metal that is raised must be removed from the surface. (A) Scratch (B) Raised MetalThe raised areas of the piston can be removed by several methods. The most common methods of removing raised metal are a file, a polishing wheel, or a Scotch-Brite abrasive disc. The file is the most aggressive method for removing raised material. The file is recommended for small areas on the surface for material that has been raised more than 0.20 mm (0.008 inch). Use caution to ensure that only the raised material is removed. Be sure that no indentations are left behind from the reconditioning procedure.The polishing wheel and the Scotch-Brite abrasive disc are used to remove small scratches in larger areas. The piston skirt is made from aluminum. In order to reduce the risk of damage to the piston, manual buffing is preferred to a polishing wheel to remove scratches and imperfections. Illustration 110 and Illustration 111 shows an example of a skirt that was buffed with a Scotch-Brite abrasive disc.