MUFFLER AS 7N3235 - Caterpillar

All 3208 EnginesSUPPLEMENT: 07/16/84SERVICE MAGAZINE, JANUARY 9, 1984, PAGE 5.The chart gives the part numbers of pistons with tapered sides on the pin bore bosses (18.2:1 Compression Ratio) for 130 kW-175 hp and below 3208 Engines. The engine in the 613B Tractor is different, it is rated at 130 kW-175 hp but has pistons with tapered sides (16.5:1 Compression Ratio).
Make a note of this under "3208 NA Engine (130 kW-175 hp and below)".
--------------- END SUPPLEMENT ---------------Reference: Service Magazine, January 31, 1983, Page 4. Some of the information in the article "Parts Service Information For Pistons" is not complete. This new article has all the information from the earlier article plus some new information. Put a mark through the earlier article and make reference to this article. In the past, several different piston designs have been used in 3208 Engines. As improved pistons have been used, some of the former pistons have been canceled. In some of the applications, pistons with straight sides on the pin bore boss were used. These pistons are no longer used at the factory, but the pistons are still available for parts service. Neither the pistons with the straight sides nor those with tapered sides are direct replacements for each other. All the pistons shown for the separate applications are direct replacements, if they have the same pin boss design and are the same size. The chart which follows shows the pistons which have been used, and those which are currently used. In each application there is one piston for each size and pin boss design which is available for parts service. The chart also shows the compression ratios for the different engine applications.
Do not use tapered connecting rods with straight side pistons. This combination of parts would cause the piston and rod assembly to be unbalanced.