Whether you drive a Ram, Chevy, or Ford diesel pickup, our expert technicians have the know-how you need - from trivia to engine rebuilds, we’ve got you covered.

Increasingly, technology in automobiles is becoming more sophisticated, and more and more systems have become reliant on electronic control modules to operate. At Harold's Used Auto Parts Inc in Philadelphia, PA, we have the trained technicians and the equipment necessary to deal with issues that arise as a result of these components.

The engine in your Chevrolet, Dodge, or Ford diesel pickup is the heart and soul of your truck. At Harold's Used Auto Parts Inc in Philadelphia, PA, we repair, rebuild, and replace engines with quality parts and builds, keeping your truck on the road for years to come.

At Harold's Used Auto Parts Inc in Philadelphia, PA, maintaining your fleet and keeping your business reliably on the road is our primary focus. As trucks wear out, and they always do, you will inevitably be faced with this dilemma - “Should I fix this truck, or replace it with a new one?” This isn’t always an easy question to answer. As your fleet specialists, our team here at Harold's Used Auto Parts Inc is here to help you decide.

Is your diesel having issues starting up? Do you hear a knocking noise? Is there blue colored smoke coming from your engine? Don't ingore the signs, those could all be signs of engine failure. One of the leading issues that lead to diesel engine failure is fuel contamination. Fuel contamination comes in different forms, but always has the same result - engine trouble and fuel system failures. Here’s what you need to know about fuel contamination with diesel trucks, from Harold's Used Auto Parts Inc in Philadelphia, PA.

Is your diesel having issues starting up? Do you hear a knocking noise? Is there blue colored smoke coming from your engine? Don't ingore the signs, those could all be signs of engine failure. One of the leading issues that lead to diesel engine failure is fuel contamination. Fuel contamination comes in different forms, but always has the same result - engine trouble and fuel system failures. Here’s what you need to know about fuel contamination with diesel trucks, from Harold's Used Auto Parts Inc in Philadelphia, PA.

The fuel system is an integral aspect of any combustion engine, but it’s particularly important on diesel trucks. Your Ford, Dodge, or Chevrolet pickup requires a perfectly functioning fuel system, devoid of buildup, leaks, and debris, to provide you with the most powerful and efficient engine performance possible. At Harold's Used Auto Parts Inc in Philadelphia, we understand that fuel system flushing is an essential process in maintaining a properly functioning engine.

The fuel system is an integral aspect of any combustion engine, but it’s particularly important on diesel trucks. Your Ford, Dodge, or Chevrolet pickup requires a perfectly functioning fuel system, devoid of buildup, leaks, and debris, to provide you with the most powerful and efficient engine performance possible. At Harold's Used Auto Parts Inc in Philadelphia, we understand that fuel system flushing is an essential process in maintaining a properly functioning engine.

Performance chip installation is one of the perks of diesel truck ownership. At Harold's Used Auto Parts Inc in Philadelphia, PA, our mechanics can professionally tune and install a chip for any application, whether you drive a Cummins, Powerstroke, Duramax, or otherwise.

Glow Plugs are an essential component of your diesel engine. However, a faulty glow plug can go unnoticed or be neglected for quite some time; your truck will still start and run, so it’s an easy issue to overlook. At Harold's Used Auto Parts Inc in Philadelphia, we want you to know what to look for, and why you should be concerned with a bad glow plug.

If you drive a Dodge, Chevy, or Ford diesel pickup, you know the amount of hard work your truck puts in. You may also be aware that diesels run a little dirtier than your average gas burner. At Harold's Used Auto Parts Inc in Philadelphia, PA, our goal is to keep your Duramax, Cummins, or Powerstroke truck on the road for many miles to come. A huge part of that is keeping your oil maintained.

No matter what type of fleet vehicles or commercial trucks you maintain, the fuel system on your diesel is an integral part of keeping you on the road. Gas systems are pretty simple - there’s basically just a pump that pushes gasoline to the injectors. Diesels are a bit more complicated.

Every year, more and more trucks come equipped with turbochargers. What was once a novelty or a performance option has become increasingly common as stock equipment. What are they for, and how do they work? Harold's Used Auto Parts Inc in Philadelphia, PA is here to help.

Your turbocharger will work in essentially the same way, whether you drive a Powerstroke, Cummins, or Duramax diesel pickup. While there are differences in designs and applications, turbos haven’t changed all that much over the past century. Now that you know what one is made of, we’ll look at how it works.

Is your diesel used for off-roading or towing? Are you looking for an increase in performance for your Cummins, Powerstroke, or Duramax truck? If so, a billet torque converter may be an option you’d like to consider. Here’s what you need to know about billet torque converters, from Harold's Used Auto Parts Inc in Philadelphia, PA.

Chevrolet, Ford and Ram diesel pickups are well-built machines. Still, sometimes they break down. Here’s what you can do to prevent that from happening and reduce the cost of a more expensive repair. At Harold's Used Auto Parts Inc in Philadelphia, PA our diesel customers are important to us and we want your diesel to last you.

The fuel system is an integral aspect of any combustion engine, but it’s particularly important on diesel trucks. Your Ford, Dodge, or Chevrolet pickup requires a perfectly functioning fuel system, devoid of buildup, leaks, and debris, to provide you with the most powerful and efficient engine performance possible. At Harold's Used Auto Parts Inc in Philadelphia, PA, we understand that fuel system flushing is an essential process in maintaining a properly functioning engine.

The turbocharger on your diesel is a precision-engineered component that requires proper maintenance to ensure it meets your needs and performs every time you get behind the wheel - no matter what the task is.  Here at Harold's Used Auto Parts Inc in Philadelphia, PA, our team is the perfect choice to ensure that the turbocharger on your diesel is always working at optimum capacity with no problems as our diesel technicians are simply the best plus when you are running tens or even hundreds of thousands of RPMs, keeping everything in good shape is absolutely necessary. Fortunately, we have exactly what you need!

What is an HEUI System you may ask? When it was first introduced, HEUI systems revolutionized diesel technology in groundbreaking ways. Though other technologies have taken the forefront since its development, HEUI systems are still extremely common throughout the diesel industry. From our team here at Harold's Used Auto Parts Inc in Philadelphia, PA, here’s a quick look at how these systems work, and what the advantages are of having one.

Injectors are a primary component on any diesel engine, old or new. Whether you drive a Chevrolet, Ford, or Dodge pickup, clean and fully operational injectors are an absolutely essential aspect of maintaining an efficient and powerful engine. At Harold's Used Auto Parts Inc in Philadelphia, PA, we offer a variety of injector solutions, from cleaning them, to diagnosing problematic injectors, to replacing them.