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International Navistar Turbo Assembly : OEM 4307258R91

INTERNATIONAL NAVISTAR TURBO ASSEMBLY : OEM 4307258R91

Shipping ICON

ORDERS PLACED BEFORE 3PM EST WILL SHIP SAME DAY

WARRANTY ICON

WARRANTY
1M MILES OR 1 YEAR

$850.00

-
+

CORE CHARGE:

$350.00
iCORE DISCLAIMER: The CORE charge is a 30 day hold and will not be processed as long as the CORE is returned within 30 days. If you do not have a CORE or fail to return the CORE within 30 days, the CORE charge hold amount will be processed at that time.

AVAILABILITY IN STOCK
OEM NUMBER 4307258R91
PART TYPE Turbo Assembly
BRAND Navistar
ENGINE MAKE International Navistar
ENGINE TYPE
YEAR
PART NUMBER 4307258R91

PRODUCT DESCRIPTION

This is a Remanufactured, Navistar Turbo Assembly, Navistar part number 4307258R91 ( OEM Part Number 4307258R91 ). This part is primarily made for a International Navistar , and comes with a One Million Miles or One Year Warranty. For additional warranty info Click Here

OEM NUMBERS

Primary OEM 4307258R91
Additional OEM 4307258R91

ADDITIONAL DETAILS

CONDITION New
UPC / Barcode 086547487344
WEIGHT 3.00 LBS

SHIPPING OPTIONS

Ship Weight : 3.00 LBS
UPS Ground, 2nd Day Air, Next Day Air

SHIPPING POLICY

Tamerx Diesel Products ships via UPS Ground. Next day air shipping can be arranged for a reasonable price of anywhere from $50.00 - $100.00 depending on the weight of the product and your location. We will do everything we can to make sure that you get the service you need. We understand how important it is to receive your order as quickly as possible.
In most cases Tamerx Diesel Products only needs one address, as long as your product is shipping to the same location as your billing information. In order to eliminate credit card fraud, your billing information must match the credit card you provide.

The terms, conditions, and details of our warranty vary from product to product. Specific warranty details can be found below.

Tamerx Diesel Products provides a replacement warranty on all of our parts. The duration and mileage limitations of the warranty vary by product and are specified on the product's detail page/item listing.

Please note that the warranty covers replacement of the part and the cost of shipping the replacement part to you only. It does not cover any shop, labor, towing, or any similar or related costs. This is not a "money back guarantee".

If you experience a problem with your part or it is not functioning properly, the correct warranty procedure is to call us at (510) 257-1777 (8:00 AM - 5:00 PM ET Monday through Friday). Be sure to have your order number and/or other relevant order information ready so we can easily locate your order and resolve your issue as quickly as possible. From that point, we will review with you any troubleshooting steps that may need to be taken and other areas or systems that can be checked to rule out external problems contributing to your part's issue. If a replacement is determined to be necessary, we will then arrange for your replacement part to ship out ASAP and issue any necessary return shipping labels and/or documents.

As is the case for the majority of the diesel products sold on Tamerx Diesel Products, your part's warranty is active as soon as you install it. In some other cases, warranty activation is contingent upon you sending us your core (i.e., your old part). Tamerx Diesel Products will provide you a return shipping label for parts that have a warranty with a core return condition. When we have received your core return, the part's warranty coverage begins. We reserve the right to void the product warranty if your core is not received within the allotted time, or if it isn't received at all. If the warranty for the diesel part you are purchasing has a core return requirement, it will be clearly noted on the product detail page/item listing.

What is a Core Charge?

A core charge (also called "core deposit") is similar to the deposit you might pay for a can or bottle of soda and is a standard requirement in the auto parts industry. For example, in many states, to promote recycling, you pay a deposit when you purchase a can of soda and receive your deposit back when you return the empty can. Many automotive parts have a core charge, or core price, that works in essentially the same way as a soda can deposit.

30 Day Core Charge Hold

You authorize Tamerx Diesel Products, to hold your credit card for the specified core charge amount and that you agree to return your core with 30 days of receiving the purchased part. When we have received your core return, the hold is released and the core charge payment is canceled.

The customer, or parts buyer, is responsible for any shipping costs associated with core returns unless otherwise specified in the product listing/detail page. Tamerx Diesel Products offers prepaid UPS shipping labels (SKU numbers UPS-CR1 and UPS-CR2) for use in returning your core that are available for purchase on our website during your shopping/order process.

The shipping label you will need to use for the core return is dependent upon what part you are purchasing. UPS-CR1 is good for cores weighing up to 20 pounds. UPS-CR2 is appropriate for shipping cores weighing 21 pounds or more. You must include enough information with the core return that clearly identifies it as a.) a Core Return, and b.) contains enough information we can use to clearly associate the core return with your order. Including a copy of the invoice or packing slip that came with the original shipment, clearly marked "Core Return", is ideal. Alternately, you can include a note marked as "Core Return" that includes your order number, full name and address, and phone number or other contact information. Failure to include this information with your returned core will most likely delay any due core credit being issued and/or delay any applicable warranty activation. Core returns need to be for the exact part purchased and cannot be damaged. Substituting another part in place of the part you have purchased is not acceptable.

All fluids must be drained.

If you have purchased a set or a parts package, you will need to return cores for all components of the set. For example, if you have purchaed a high pressure oil pump with an IPR valve, you will need to return both HPOP and IPR valve cores to receive proper credit. If you have purchased an EGR cooler/EGR valve package, your core return must consist of an EGR cooler core and an EGR valve core, or core credit will not be given.

Core Charges are often mandated by state legislature, and, as such, the actual core charge and taxes on the charge may vary depending on the state in which you buy your part. The Tamerx Diesel Products core charge presented to you online today with your item is representative of the most common core charge.


The Turbo Assembly (OEM 4307258R91) is designed to meet the specific needs of International/Navistar diesel engines requiring a direct-fit replacement. This component is responsible for directing compressed air into the engine's intake system, supporting optimal combustion efficiency and maintaining proper exhaust flow. Manufactured to OEM specifications, it ensures secure fitment and dependable function in heavy-duty applications. The assembly is built with durable materials to withstand high temperatures and rotational forces found in demanding operating environments. Ideal for use in fleet maintenance or repairs involving restricted airflow or underperforming turbo systems.

PEOPLE ALSO ASKS | BLOG(S)

The turbocharger plays a vital role in boosting the power and efficiency of your International Navistar engine. The International Navistar Turbo Assembly (OEM 4307258R91) is designed to optimize the intake of air, improving combustion and overall engine performance. Understanding how it functions and the importance of maintaining it can save you from costly repairs and downtime.

Functions of the International Navistar Turbo Assembly

  • Boosts Air Intake
    • The turbocharger compresses the air entering the engine, allowing for more air to mix with the fuel, leading to improved combustion.
  • Increases Fuel Efficiency
    •  By improving air intake and combustion, the turbo assembly helps the engine burn fuel more efficiently, reducing fuel consumption.
  • Reduces Exhaust Emissions
    • A properly functioning turbocharger improves combustion, which reduces harmful exhaust emissions.
  • Prolongs Engine Life
    • Efficient air intake reduces the strain on the engine, helping extend its lifespan by ensuring optimal combustion.

Maintenance Tips for the Turbo Assembly

  • Regular Inspection
    •  Check the turbo assembly for any signs of wear or damage, especially in the compressor and turbine housing.
  • Monitor Oil Levels
    • The turbo relies on a constant supply of clean oil for lubrication. Ensure regular oil changes and monitor oil levels to prevent overheating.
  • Check for Air Leaks
    •  Inspect the hoses and connections around the turbo for any leaks that could reduce the efficiency of the air intake.
  • Clean Air Filters
    •  Regularly clean or replace air filters to ensure the turbocharger receives clean air and doesn’t get clogged with debris.

The International Navistar Turbo Assembly (OEM 4307258R91) is essential to maintaining your engine’s power and efficiency. Regular maintenance, such as inspecting for leaks and ensuring proper oil levels, can significantly improve the longevity of your turbocharger and overall engine performance. TamerX Diesel Parts offers high-quality replacements to keep your engine running smoothly and efficiently.

The turbo assembly is a vital component for boosting engine performance, allowing more air into the engine for enhanced power and efficiency. However, when the turbo assembly fails, it can lead to several serious issues that affect both your engine's performance and the longevity of your vehicle. Understanding the consequences of a failed turbo can help you take action before it leads to costly repairs.

Consequences of a Failing Turbo Assembly

A failing turbo assembly can manifest in various ways, each of which can compromise your vehicle’s functionality. Here are some of the most common symptoms and consequences:

  • Loss of Power
    •  One of the first signs of turbo failure is a significant decrease in engine power. You may notice sluggish acceleration or difficulty reaching higher speeds.
  • Excessive Exhaust Smoke
    • A damaged turbo can cause oil to leak into the exhaust system, resulting in thick, blue or gray smoke from the exhaust.
  • Whining or Whistling Noise
    • A failing turbo often produces a high-pitched whining or whistling sound, especially when the engine is under load or accelerating.
  • Check Engine Light
    • Turbo issues can trigger the check engine light as the engine control unit (ECU) detects problems with air intake or fuel delivery.
  • Oil Leaks
    • A failed turbo may cause oil to leak around the turbo housing or into the intercooler, leading to oil loss and potential engine damage.
  • Poor Fuel Efficiency
    •  Without a functioning turbo, your engine will have to work harder, leading to decreased fuel efficiency and increased consumption.

Why You Should Address Turbo Issues Immediately

Driving with a failed turbo can lead to more severe problems, such as:

  • Engine Damage
    •  Continued operation with a faulty turbo can cause excess strain on the engine, leading to potential damage to internal components.
  • Costly Repairs
    •  If left unchecked, a failing turbo assembly can cause further damage, requiring expensive repairs or even engine replacement.
  • Increased Emissions
    •  A malfunctioning turbo can cause your vehicle to emit higher levels of pollutants, potentially resulting in failed emissions tests and fines.

A failed turbo assembly can drastically affect your vehicle's performance, fuel efficiency, and even lead to long-term engine damage if not addressed quickly. If you notice any symptoms of turbo failure, such as power loss or unusual exhaust smoke, it's essential to have your vehicle inspected and repaired as soon as possible. Regular maintenance and timely repairs can help extend the life of your turbo and keep your vehicle running at optimal performance.

Yes, it can lead to poor acceleration, increased exhaust temperatures, or low boost conditions.

Common causes include oil starvation, contaminated oil, foreign object damage, or excessive heat.

Installation usually takes 4 to 6 hours, depending on vehicle access and technician experience.

In most cases, no tuning is required, but it's recommended to clear any related ECM fault codes after installation.

International Navistar Turbo Assemblys