Cummins 5.9L B Series Aftercooler Bundle, 4933306 3977272 Replacement

Mr Cool replacement for the 4933309 Cummins Aftercooler Bundle the 5.9 litre B Series marine engines.

Replaces Cummins 3977272 4933306 4933309

This is the 5X13 inch part.

Things you should know 

• • This part is made with OEM equivalent materials, design and manufacturing methods
    • Made in the USA
    • The fin count is 25FPI 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 4933309
• Cummins Aftercooler bundle 4933306
• Cummins Aftercooler bundle 3977267

All assembly numbers for reference:

• The entire assembly part number list is below for reference
  
  • Complete Assembly 4302547
    • Housing 4933308
    • core stabilizers
    • O-Rings 
    • EndCaps 3919856
    • End Cap 3979772
    • End Cap 3919906 and 3866481

• INCLUDES:
  • 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.

This is a Mr Cool (USA) Marine Part MRC4933309