TURBOCHARGER GP 1679666 - Caterpillar

General Service Information GU08-04
Technical Supplement
August 2008 3304 and 3306 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 that 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.
3300 Long Block General Information
All Reman 3300 long block offerings are of the spacer plate block design. Pre-combustion chambers are not included with the long block. If new pre-combustion chambers are needed, they must be ordered separately. Alteration of the oil supply at the rear face where the flywheel housing mounts may be necessary. Some blocks use a 1S1768 sleeve, while others use a 4B3938 plug in the oil supply hole. The flywheel housing locating dowel also varies. Some configurations use a 4L3395 and others a 2A3798 dowel. In each of these situations, the easiest way to ensure correct installation when replacing an existing block with a Remanufactured Long (or Short) Block is to use exactly the same part numbers found on the existing block. Sleeves and dowels to accommodate all applications are shipped together with the long block in a separate package. Also inspect the oil drain and supply on the right side of the block to ensure it matches the fuel injection pump supply and drain configuration.
Some long blocks are shipped with two engine oil coolers. Use the one that matches the