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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 original engine. Return both the unopened, unused oil cooler, and the customer's used oil cooler, along with the long block core. Following this rule will help avoid unnecessary add charges for missing parts.

CAUTION: DO NOT USE 3300 LONG BLOCKS IN D330C AND D333C ENGINE APPLICATIONS.

Identification of 3304

When the 0R3613 long block is used to replace a counterbore block, care must be taken to ensure the cylinder head on the long block is compatible with the old engine components. The old engine must be able to use one of the following Reman head numbers: 0R1394, 0R0821, 0R2086, 0R2674, 0R2175, 0R2672, or 0R2178. This is required because the differences between a D330C and a 3304 are difficult to distinguish. The water bypass from the cylinder head to the water pump is different. The cylinder heads are not interchangeable.

If the old engine can use any of these Reman head numbers it is a 3304 and a long block may be available based upon the cylinder pack you would use in the old engine.

The 0R3664 is a cylinder head similar to 0R2674, less the prechambers. This provides a cylinder head with inlet valves and exhaust seat inserts which are acceptable in all horsepower ranges.

Identification of 3306

When the 0R3611 long block is used to replace a counterbore block, care must be taken to ensure the cylinder head on the long block is compatible with the old engine components. The old engine must be able to use one of the following Reman head numbers: 0R1367, 0R1347, 0R1255, 0R0822, 0R2087, 0R1077, 0R2149, 0R1078, 0R2150, 0R0978, 0R2146. This is required because the differences between a D333C and a 3306 are difficult to distinguish. The water bypass from the cylinder head to the water pump is different. The cylinder heads are not interchangeable.

If the old engine can use any of these Reman head numbers it is a 3306 and a long block may be available based upon the cylinder pack you would use in the old engine.

The 0R3663 is a cylinder head similar to 0R0978, less than prechambers. This provides a cylinder head with inlet valves and exhaust seat inserts which are acceptable in all horsepower ranges.

3300 Long Block Selection:

First, make certain whether the customer's engine is a 3304 or 3306 (see the instructions and caution above). Next, determine whether it has pre-combustion chambers (PC) or direct injection (DI). Normal parts sources (parts book, microfiche, SIS, NPR, etc.) can be used to look up this information by 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 3306, you will have to wait until the next step to further narrow the candidates list. Next, use normal parts sources to look up the correct current piston part number for the customer's engine. Don't forget to check NPR to make sure you are not using obsolete part numbers. If the customer's piston is not one of the numbers shown under "Piston P/N's...", Reman does not have a long block offering. If the customer's piston is shown, you should now have narrowed the candidates down to one or two columns of the chart.

Next, follow the remaining candidate columns down into the consist section of the chart. Check the camshaft, then cylinder head part numbers shown against the part numbers called for by normal parts sources to service the customer's engine. By this point you have narrowed the search down to one candidate long block part number. Now check the other part numbers listed in the same column of the consist chart. For a long block candidate to become a selection, all the part numbers listed under the long block part number should match the correct service part numbers for the customer's engine. If, at any point in the above process the Reman consist fails to match the part numbers called for to service the customer's engine, Reman does not have an offering that matches the customer's engine. You may select a long block that isnt a perfect match if you believe changing the parts that dont match is worth the time and money to do the work.

NOTE: Don't forget to read the "notes" referenced in the last column of the chart. These notes explain, among other things, important adaptability and shipping information.