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 Cummins Aftercooler bundles: 4933309 4933306 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
End Caps 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.
