EDGE-CUTTING 4T3901 - Caterpillar

General Service Information GU08-05
Technical Supplement
August 2008 3406 and C-15 Long Blocks
Long Block Selection General Information
The purpose of this technical supplement is to help you decide if there is a Caterpillar remanufactured long block available for a particular engine application. When making your decision, please keep the following points in mind.
Long blocks are not available for every engine application. The long blocks we do offer can, however, be used to service many applications even though the long block does not exactly match the original engine configuration. When the consist of the Reman product offering differs from the consist of a customer's engine, only the dealer and customer can decide whether or not it makes economic sense to change the parts that differ.
It's Caterpillar's policy to incorporate the latest critical engineering changes into Cat Reman products. Therefore, long blocks may be offered with some parts from a later design era as service repairs for engines from an earlier design era. An example is the 3406C crankshaft, connecting rods, and pistons which are in certain 3406B long blocks. The result is that the parts in the long blocks match each other but do not match the parts consist of new production engines, nor do they match any single parts book. When long block parts consists differ from the official parts list, Reman provides an engine plate alerting the customer to Special Instruction or Service Magazine articles for information on non-standard parts.
Make sure any future engine/long block repairs which do not use parts called for by the original parts book, or official replacements called for by parts and service sources, are carefully documented. If you choose to make any configuration or consist changes, good documentation can prevent problems the next time parts are ordered.
3406 Long Block Selection Instructions
First, decide what design era the customer's engine is from. If the engine is an original 3406 (called 3406A in the following chart), determine whether it has pre-combustion chambers (PC) or direct injection (DI). Normal parts and service sources can be used to look up this information by engine serial number, if necessary. This will narrow down the list of long block candidates shown on the following chart.
If the customer's engine is a 3406B or 3406C, you will have to wait until the next step to further narrow the candidates list. Next, use normal parts sources (parts book, microfiche, SIS, NPR, etc.) to look up the correct current piston part number for the customer's engine. If the customer's piston part number is not shown in the following "3406 Long Block Consist and Selection Chart", use NPR or other sources to find the most current part number intended to service the customer's engine.
If the customer's piston still doesn't appear in the chart, Reman does not offer a perfect service replacement long block. If you are willing to do further research, you