# 4933306 3977272 4933309 Cummins 5.9L B Series Aftercooler Bundle, 4933306 3977272 4933309 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 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.
-   2\. Reducing air bypass at the cooler extents.

This is a Mr Cool (USA) Marine Part MRC4933309

## Details

- **Price:** 6743.0 AUD
- **Vendor:** Mr Cool
- **Tags:** Sawley’s AAM Aftermarket – Cooling Systems Mr Cool | Marine Heat Exchangers & Kits

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 6743.00 AUD | In stock |

## Images

- 4933306 3977272 4933309 Cummins 5.9L B Series Aftercooler Bundle, 4933306 3977272 4933309 Replacement
- 4933306 3977272 4933309 Cummins 5.9L B Series Aftercooler Bundle, 4933306 3977272 4933309 Replacement
- 4933306 3977272 4933309 Cummins 5.9L B Series Aftercooler Bundle, 4933306 3977272 4933309 Replacement
- 4933306 3977272 4933309 Cummins 5.9L B Series Aftercooler Bundle, 4933306 3977272 4933309 Replacement
- 4933306 3977272 4933309 Cummins 5.9L B Series Aftercooler Bundle, 4933306 3977272 4933309 Replacement
- 4933306 3977272 4933309 Cummins 5.9L B Series Aftercooler Bundle, 4933306 3977272 4933309 Replacement
- 4933306 3977272 4933309 Cummins 5.9L B Series Aftercooler Bundle, 4933306 3977272 4933309 Replacement
- 4933306 3977272 4933309 Cummins 5.9L B Series Aftercooler Bundle, 4933306 3977272 4933309 Replacement
- 4933306 3977272 4933309 Cummins 5.9L B Series Aftercooler Bundle, 4933306 3977272 4933309 Replacement
- 4933306 3977272 4933309 Cummins 5.9L B Series Aftercooler Bundle, 4933306 3977272 4933309 Replacement

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/4933306-3977272-4933309-cummins-5-9l-b-series-aftercooler-bundle-4933306-3977272-4933309-replacement)
> Updated: 2026-06-23