HOLDWELL HX40W Turbo Turbocharger 4037686 4037687 Compatible with Cummins 6CTA 6C ISC Engine

What This Turbo Actually Fixes

When a turbo fails on a Cummins 6CTA or ISC, you’ll notice it immediately:

• Loss of boost pressure and power

• Excessive black or blue smoke

• Whining or grinding turbo noise

• Poor towing or hauling performance

• Increased fuel consumption

The HX40W replacement turbo restores proper boost and gets your engine back to delivering the torque it was built for.

Part Number:
4046102 4036949 4025039 4089716 4036950 4037686 4037687 4037689 4037690 4037691

Built for Cummins Medium-Duty Performance

Designed specifically for:

• Cummins 6CTA engines

• Cummins 6C / ISC engines

Commonly found in:

• Medium-duty trucks

• Commercial vehicles

• Industrial and heavy-duty applications

This is a workhorse turbo for engines that don’t live easy lives.

Application:
Compatible with Cummins Engine 6CTA 6C ISC

OEM Replacement Compatibility

Direct replacement for part numbers:

• 4037686

• 4037687

Ensures proper fitment with factory manifolds, oil lines, and mounting points.

Product Name: Turbocharger
Product Number: 4046102 4036949 4025039 4089716 4036950 4037686 4037687 4037689 4037690 4037691

HX40W Turbo: Why It Matters

The HX40W is known for durability and performance in diesel applications:

• High airflow capacity for strong boost under load

• Designed for heavy-duty operation

• Reliable performance in towing and commercial use

• Built to handle high exhaust temperatures

It’s not just about power—it’s about consistent, dependable power.

Real-World Performance Benefits

After installation, you’ll notice:

• Restored boost pressure and torque

• Improved towing and hauling capability

• Reduced smoke output (if turbo-related)

• Better fuel efficiency under load

• Smoother engine performance

Basically, your diesel goes back to doing what it’s supposed to—pulling hard without complaining.

Compatible with Cummins Engine 6CTA 6C ISC
Please check the OEM part number and picture carefully to make sure it fits your model and send us your model if you are unsure
If you have any other questions about our products, please feel free to contact us.

Installation Notes (Respect the Process)

Turbo replacement on a diesel isn’t something to rush:

• Prime turbo with oil before startup

• Inspect oil feed and return lines

• Check intercooler and piping for contamination

• Replace gaskets and seals

• Verify boost pressure after install

Skip these steps and you’ll be doing the job again. Diesels don’t forgive shortcuts.

Who This Turbo Is For

This turbo is ideal if you:

• Need a reliable replacement for a failing HX40W

• Run a Cummins 6CTA or ISC engine

• Depend on your vehicle for towing, hauling, or work

• Want OEM-style performance and durability

If your truck works hard, your turbo needs to keep up.

Why This Upgrade Makes Sense

The HOLDWELL HX40W Turbocharger delivers exactly what a diesel engine needs—reliable boost, strong airflow, and durability under pressure. It’s a practical replacement that restores performance without overcomplicating things.

And honestly, if your Cummins isn’t building boost… it’s not doing its job. It’s not just a turbo replacement, this HX40W turbo Cummins 6CTA 6C ISC 4037686 4037687 replacement will do that and then some.