2517623C94 | Genuine International® Turbocharger B2UV Kit 12.4L

1. Increase Engine Power

A turbo forces extra air (and therefore more oxygen) into the engine cylinders.
More oxygen allows more fuel to burn, creating stronger combustion — meaning more horsepower and torque.
This is why a 12-liter turbocharged diesel can perform like a much larger naturally aspirated engine.

2. Improve Fuel Efficiency

Because the turbo reuses exhaust energy to compress air, the engine works more efficiently.
The result is better fuel economy — especially under load or during highway driving.

3. Reduce Emissions

A turbo helps burn fuel more completely, which lowers smoke and carbon emissions.
In modern engines, turbocharging is paired with exhaust after-treatment systems (like EGR and DPF) for cleaner operation.

4. Enhance High-Altitude Performance

At high altitudes, air is thinner and engines lose power.
A turbocharger compensates by forcing more air into the engine, maintaining consistent performance no matter the elevation.

5. Downsizing with Power

Manufacturers can use smaller engines that consume less fuel but still produce the same (or more) power as larger, non-turbo engines.
This reduces engine weight, improves efficiency, and saves costs.

1. Loss of Power

The vehicle feels sluggish or slow to accelerate.
You may notice the engine struggling to pull under load or going uphill.
This usually happens because the turbo is not building enough boost pressure due to worn bearings, leaking seals, or broken vanes (in VGT turbos like your 7099274C94).

2. Excessive Exhaust Smoke

Blue smoke: burning engine oil from a failed turbo oil seal.
Black smoke: too much fuel and not enough air (boost loss).
White smoke: oil leaking into the exhaust or compressor side and burning off.

3. Whining, Whistling, or Grinding Noises

A healthy turbo makes a smooth “whistle” when spooling up.
A high-pitched whine, siren sound, or grinding noise usually means:
Worn or damaged bearings,
Compressor wheel contact with housing, or
Imbalanced shaft.

4. Poor Fuel Economy

Without proper boost, the engine burns more fuel to produce the same power.
You may see a noticeable drop in mileage or higher fuel use under load.

5. Check Engine Light / Fault Codes

Modern engines (like Navistar A26) will detect boost or pressure problems.
Common codes: “Underboost,” “Overboost,” or “Turbo Actuator Fault.”
A diagnostic scan can confirm whether it’s the turbo or related sensors.

6. Oil Leaks Around the Turbo

Oil visible near the compressor housing, turbine, or intercooler pipes.
Often due to failed internal oil seals or restricted oil return lines.
Can lead to oil loss and eventual turbo seizure.

7. Excessive Boost or Overboost

The engine may surge, hesitate, or throw overboost codes.
In VGT turbos (like 7099274C94), stuck vanes or a faulty actuator can cause uncontrolled boost pressure.

8. Excessive Shaft Play

If you remove the intake pipe and feel side-to-side or in-out movement of the turbo shaft, it’s a clear sign of worn bearings.
Even small play can quickly cause compressor wheel damage.