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July 4 Week Schedule

Happy July 4th from AMBAC International AMBAC International will be closed on Wednesday, July 4, in observance of Independence Day.  We hope that you and your family have a safe and happy holiday.

We will not be shipping Wednesday or Friday of this week.

Visit www.AMBACinternational.com to place orders or for more information.

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AMBAC Extends Warranty on AMBAC Brand Products

AMBAC International Effective immediately, AMBAC International has extended its Standard Limited Warranty on AMBAC brand products to 24 months and unlimited mileage.

AMBAC’s customers depend on their engines for work; they have a job to do, a mission to accomplish. Working engines all over the world need fuel injection systems, they are the heart of the engine and the most complicated system under the hood. The new 24-month extension gives AMBAC’s customers the understanding that they can count on AMBAC’s products.

The men and women who use AMBAC’s products are the working heroes of our everyday lives. They can’t afford downtime or expensive repairs to the equipment they need to work. The technicians who install AMBAC products are putting their name on the repair, they need to know that it’s going to last. AMBAC gets that and is here to help.

The newly extended warranty on AMBAC brand commercial products is twice the industry standard warranty of 12 months. Should there be a problem, the AMBAC warranty plan remains simple and customer focused.


About AMBAC International:

AMBAC fuels the hardest working engines in the world.

For over 100 years, AMBAC has been supplying the hardest working engine components for the hardest working engines and people.  As a global supplier of diesel fuel systems and related components, AMBAC’s products are used in high-quality, heavy duty diesel engine technologies.  In fact, many major OEMs trace their heritage to AMBAC design concepts and engineering.

AMBAC’s product lines include fuel injection systems and related components including turbochargers, high pressure oil pump products, and engine governors for power generation and stationary power applications. AMBAC products are used in a variety of industries and applications such as agriculture, transportation, defense, stationary power generation, and many others.

As a registered ISO9001 company, AMBAC has a very active Continuous Quality Improvement Program. The present Quality Management System is frequently audited internally and by third party auditors to ensure AMBAC stays focused on its commitment to Customer Satisfaction.

AMBAC International is an employee owned company located in Elgin, South Carolina and sincerely believes that its team is the strength of the company.

For more information about AMBAC’s extended warranty on AMBAC brand products, to place an order, or to learn more about AMBAC International’s products, visit the website at www.AMBACInternational.com or call 800-628-6894.

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Turbocharger Failure Modes Part Two

Turbocharger Failure Modes Part Two

You may have read about the most common causes of failures in turbochargers in our most recent newsletter. If you missed the article, you can read it here on our blog.

In this article, we have outlined some additional common failure modes of turbochargers and some tips on how to identify these root causes.

  1. Lack of oil
  2. Foreign debris
  3. Hot shut downs
  4. Engine tuning


As we look at some additional failure modes, one thing to remember is that there is always evidence of how the failure happened, but sometimes there are multiple factors contributing to the failure.

Lack of oil

If lack of oil is the cause of turbocharger failure, the proof will be fairly straightforward. There will be bluing from excessive heat and galling of the metal. There can also be a transfer of the bearing material onto the shaft.

Foreign debris

Foreign debris in the engine is also fairly obvious. At full load turbo speeds, any debris that comes from the air box as a result of a a dirty or missing filter will easily cause a catastrophic failure. There will be noticeable fins broken off of the compressor wheel. If the damage is to the turbine (hot side) of the wheel, barring any excessive bearing clearances, internal engine damage could have occurred. This damage could be in the form of small pieces (including spark plug tips, glow plug tips, pieces of valves) coming through the combustion chamber and into the turbine housing.

Hot shut downs

Hot shut downs are very common. Whether in mountainous areas, hauling a load, or racing, the turbo must be allowed to cool down before shutting off the engine. On my vehicles, I have a pyrometer in the exhaust stream so I can monitor the temperature. There are also aftermarket controllers that keep the engine running until the temperature returns to normal or for a pre-set time interval. If an engine is shut down while hot, the turbo burns off the protective layer of oil that needs to be there for the next start. After four or five times of starting the engine with no oil on the turbo shaft, the damage is done. This damage is compounded if the typical starting mode is “Stomp on the accelerator to hear the turbo !!”

Engine turning

There are many versions and degrees of engine tuning, and not all are detrimental. Some design parameters add a certain amount of safety with no harm to the turbo. There are also many methods of configuring the turbo to tweak the performance, but the law of diminishing returns can set in quickly. Particularly in racing and tractor pulling, where there is so much excess boost pressure, the entire shaft is in effect “pushed” into the thrust bearing, causing excessive end play and wearing out the thrust bearing prematurely.

Bottom line: I would make it a policy never to give a customer a replacement turbo or a refund without first analyzing the failed unit to try to determine the cause of the failure.

Greg Arsenault – AMBAC International. 4-25-18

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Spring Product Feature: Truck Turbos

Take advantage of special pricing and no core charges for select turbos for:

  • CAT 3406E/C15
  • International Harvester Navistar
  • Cummins Truck Engines QSK / ISX /QSX
  • Detroit Series 60
  • Mack E7 / Volvo D12


Download Price Sheet Contact us at 800-628-6894 with questions or to place an order


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How to Destroy a Turbocharger

The top failure modes of turbochargers written by AMBAC’s own Greg Arsenault.

The top failure modes of turbochargers are:

  1. Contaminated oil
  2. Lack of oil
  3. Foreign debris in air stream
  4. Excessive heat/friction
  5. Hot shut downs
  6. Physical contact of rotating components within the housing


failed turbochargerAlthough these failures are well known, they are worth looking at more closely. In a perfect world, the turbo should last as long as the engine. Unfortunately, we don’t live in a perfect world. If we do not find out the precise reason a turbo failed, the replacement turbo is apt to wear out in the same manner and much faster than it should.


The # 1 killer of turbos is contaminated or dirty oil.

This is even more critical in Gasoline applications, as the temperatures can be up to 1800F degrees and speeds can go up to 300,000 RPM – as compared to only 1200F degrees and 100,000 RPM for a typical diesel application. The failures will happen in the same manner, regardless of the source of ignition, just at differing rates.

How does contaminated oil destroy a turbocharger?

The typical turbo shaft spins in two journal bearings. These bearings, made of a brass composite/alloy are not fixed – they spin at theoretically half the speed of the turbo shaft. As the dirty oil is introduced in a very narrow band through the holes in the rotating bearing, the holes score and then wear the softer material of the bearings. As the wear progresses, both the inside and outside diameters of the bearing are opened up, allowing the shaft to “wobble” from excessive radial clearance. This is clearly seen in the bearing on the right in the photo below. Once this clearance is enough for the shaft/wheel assembly to become out of balance or touch the housing (while rotating at 100,000 RPM or more), a catastrophic failure is imminent.

Therefore, you should always require your customer to change the oil and filters at recommended intervals or risk voiding their warranty.

The other failure modes are closely related, and we will discuss them in future articles.

Greg Arsenault – AMBAC International. 3-29-18

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HEUI Injector Problems

Common HEUI Injector Problems and the Sources of These Problems

Both the Ford Power Stroke 7.3L (1994-2003) and the 6.0L (2003-2010) use HEUI (Hydraulic Electronic Unit Injector) style injectors. It’s a hybrid injector that uses engine oil under high pressure and fuel within the injector… Great concept, but they are prone to a couple of issues:

STICTION… As the engine oil breaks down or gets dirty, it creates a gummy residue, causing the injector’s internals to stick. Resulting in a general drag on performance and symptoms such as hard starting (especially in cold weather), roughness, and white smoke.

Recent improvements really help, especially in the 6.0L Injector. DLC (Diamond Like Coating), and a better spool valve/coil improve internal wear and friction problems. AMBAC only stocks the improved version of the 6.0L injector (INJ60B), with these your engine will perform better and longer. *AMBAC takes either injector back as core when you upgrade your injectors.

Remember, you should ALWAYS change the oil and filters when replacing injectors. One of the principle causes of injector failure is dirty engine oil. Also, it can be helpful to use an oil additive specifically designed for stictions issues.

ELECTRICAL… The wiring harness for these injectors is built into the valve cover gasket. After many miles, the passthrough wire connector can break. You’ll know it when the glow plugs quit (burnt pins in the connector) or it idles well, but as you accelerate performance breaks down. A scan might show a 1316 code (IDM) … it can’t detect each injector. A buss test on the injectors can help…if you have more than 1 injector with a weak buss test, check your wiring harness. Fortunately, the harnesses are easily replaced.

Little know fact: AMBAC (then known as American Bosch) pioneered the concept that became Unit Injection.

HPOP (High Pressure Oil Pump) and IDM/FICM issues? Contact us with questions. 800-628-6894

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AMBAC New and Reman Chargers

AMBAC Turbocharger AMBAC offers over 100 light, medium and heavy duty engine applications – Vehicle brands include:

  • CAT, Chevrolet, Cummins, Detroit Diesel, Ford, GMC, IH/Navistar, Isuzu, Mack, Volvo 93 applications for agricultural, construction, and industrial vehicles – Vehicle brands include:
  • Case, Case IH, CAT, Ford, Ford New Holland, International, John Deere, Komatsu, Massey Ferguson, Minn Moline, Oliver, White

Learn more about our new and reman turbochargers by visiting our website at www.AMBACinternational.com or contact us at 800-628-6894 with questions or to place an order.

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