4025340 Cummins Aftercooler Core

• This part is in stock and ready to ship globally. 
• Offered is our replacement for the 4025340  Cummins Aftercooler Core the 8.3 litre C Series.
• This is the 5X19 inch part. 
• We will be offering the 5X19 inch before summer arrives. 
• This part is guaranteed for fit and function and carries a 2 year warranty per our terms and conditions. 

What do you get? 

• When you open the box you get: 
• A tube of lubricant and a brush for application.  
• Using lubricant makes it easier to install the part and then remove it when doing your regular maintenance. 
• Two sets of 0-rings (in different diameters).
• Smaller which matches the OEM offering plus a larger cross section which may compensate for a worn housing as your system ages.
• Pre-installed core stabilizers
• Although this is disregarded by some youtube installers these stabilizers are quite important. They perform 2 functions:
• 1. Reducing vibration at the tube header connection which has the potential of extending the cooler life and keep the area below the header from becoming embrittled. 
• 2. Reducing air bypass at the cooler extents. 

Things you should know 

• This part is made with OEM equivalent materials, design and manufacturing methods
• Made in the USA
• The fin count is 30FPI as with the OEM
• Our headers are made with extruded billet brass
• this is better brass material than from other parts of the world where only one substandard brass is allowed for export.
• or they use machined cast headers which have a lower density likely leading to a shorter product life
• We have decades of know how that have gone into this product. 

 Some details to note:   

• There’s a slight configuration change. There’s a slight little button (center) on top that we've left on the header. 
• It helps us in manufacturing
• we guarantee it won’t get in the way. 
• It allows us to make this part so it is very round, very cylindrical and within a few thousandths of an inch (~0.002") of our dimensional target.  It's a great fit to the housing.  
• This eases installation and later, when servicing, the cylindricity of the part can ease the removal of the unit.  

Our product is a drop in replacement for these part numbers:

• Cummins Aftercooler bundle 4025340
• Cummins Aftercooler bundle 4078413

All assembly numbers for reference:

• The entire assembly part number list is below for reference
• Complete Assembly 5261994
• Housing 3974399, 4989468
• core stabilizers
• O-Rings 
• EndCaps 3919856

This part fits the following engines:

• Cummins 8.3L C Series