The Ultimate Guide to Buying a Used Diesel Engine

In the past, 82% of industrial companies experienced unplanned downtime that increased manufacturing costs by as much as $206,000 an hour.

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Unplanned downtime can occur for various reasons, one of them being faulty equipment parts. It’s important to check your machinery often to avoid costly downtime in the future.

Learning how to buy a used diesel engine can come in handy if your machines stop working because of engine problems. Keep reading to learn what to do when searching for an affordable used diesel engine.

Research and Compare Prices

When looking for a used diesel engine, the prices are likely to vary depending on the engine brand, wear and tear, and how old the engine is.

A lot of diesel engine companies sell used diesel engines online these days so you’ll have a lot of choices to compare. Don’t buy from the first shop you come across, complete valuable research to make the best decision.

If you want to minimize your costs, compare prices from different shops. Don’t look for the cheapest option. Instead, try to get the most out of your money.

Some shops allow you to negotiate based on your knowledge of the different price ranges. Through research, you should be able to get an efficient used diesel engine without overpaying.

Check for Compatibility

There are different types of engines and not all of them will be compatible with your machine. Don’t make the mistake of buying a used engine with diesel technology that fails to work in your vehicle.

Check the size of the engine as you don’t want something too small or too big. You can decide between a used small diesel engine or a used industrial diesel engine.

Automobiles and light trucks mainly use small diesel engines. Industrial diesel engines are more suitable for construction vehicles and mining vehicles.

You should also keep in mind that an engine made for another machine might not work in yours. Different brands manufacture their engines to fit the needs of a specific machine.

Consult your vehicle’s manufacturer’s manual to help you choose a compatible option.

Ask for a Warranty

Used diesel engines can come with a warranty but they won’t always. To get the best bang for your buck, ask for a warranty through the diesel engine company you are purchasing from.

Companies that don’t offer warranties avoid taking responsibility if your engine were to break down. With a used engine warranty, you can trust that your new equipment will work despite being used in the past.

A lot of engine warranties last a year so if your engine breaks down during the first year of owning it, the company will replace it at zero cost.

Learn About a Company’s Experience

Companies selling diesel engines for years have more experience in the field than newer companies. However, you don’t have to write off new businesses right away because their technicians may still have the necessary experience.

An experienced business will be able to distinguish between good and bad engines as well as know the different types of engines available.

A company that sells engines should be equipped to advise you and answer any questions you may have.

Read Customer Reviews

Customer reviews and testimonials are a great way to get an idea of the experience you will have when you purchase from a specific engine supplier.

Look at a company’s past reviews and note if positive reviews outweigh the negative. Typically, negative reviews are hard for any business to avoid because some customers don’t tell the whole truth.

It’s still a good idea to read through negative reviews to see if there are multiple reviews with the same complaints. You can also see if the company replies to these reviews to offer solutions to their unhappy customers.

Another way to find a business with good customer service is to ask people you know if they recommend a used diesel supplier. Ask peers, friends, and family members who have needed a used engine in the past.

Decide on a Diesel Engine Stroke

For diesel engines, there are two main strokes, a 4-stroke engine, and a 2-stroke engine.

4-stroke engines complete a combustion cycle with two piston strokes and a 2-stroke engine completes the cycling process with one piston stroke.

4-stroke engines are quieter and emit less smoke than the latter. The cons to this engine stroke are that they have an increased risk of stalling and come at a high cost.

2-stroke engines are more durable but they produce a lot of smoke and their power tends to wear off.

Know About Old vs. New Engines

When buying an engine that was previously owned, you don’t have to search for an old one. A user could have bought a diesel engine one day and sold it the next because it wasn’t the right fit for them.

Old and new engines vary in cost. You might have guessed it, but newer engines are more expensive than old ones. If you have a strict budget, you might only be able to afford an old engine.

No matter the engine you buy, check for visible signs of damage. Just because an engine is newer doesn’t always mean it is better in terms of usage.

Test for Any Oddity

If an engine dealer lets you conduct a test drive, take them up on the offer. If they don’t let you test an engine, consider it a red flag.

During the test, check for these abnormalities:

• Oil leakage
• The engine runs when the ignition is off
• The engine emits unpleasant odors
• Loud noises like knocking and hissing sounds
• Decrease in gas mileage

If you don’t experience any of these problems with a used engine, it should be good to go!

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Observe External Parts

In some cases, you can tell that an engine is faulty without completing a test drive. Check if any of the following parts are worn out or rusty:

• Hoses
• Check belts
• Heat exchangers

Do not buy the engine if these components are worn. These problems indicate that the engine is fraudulent or was cared for by a negligent owner.

Reputable companies don’t put out worn engines for sale. A company that does might try to rip you off when you make a purchase.

Get a Quote

Compared to a new engine, a used engine quote should be more affordable. However, the engine price might not be the only thing the supplier is quoting you for.

Some engines come with additional parts and warranties. These fees should be included in your quote. If you are shipping an engine, the price of freight should also be calculated into the total cost.

To know exactly what you are getting before buying anything, check that your quote meets or exceeds the expectations you have for purchasing a used diesel engine.

Ask About Engine Testing

Remanufactured engines could mean different things depending on the company you choose to buy from. Ask the business if they tore the engine down and machined the block, crank, and head.

Dyno-testing is also critical when buying a remanufactured diesel engine. This technique refers to testing that the engine meets performance standards and is ready to go when you make the purchase.

Dyno-testing allows companies to correct faulty engines so that they are good enough to sell used for a discounted price. Even if a supplier tests their engines, it’s still a good idea for you to test them yourself.

Do You Need a Diesel Engine?

Before shopping around for a diesel engine, it’s best to make sure yours is no longer able to work. You don’t want to buy a different engine if yours can be repaired for a lower price.

These are some of the signs and symptoms of a worn-out diesel engine to be aware of:

• Engine runaway
• Rough idle
• Excessive blow-by
• Turbocharger failure
• Trouble starting the engine
• Blue smoke

Some of these signs indicate larger issues while others need repairs so that the engine can start working effectively again.

If your diesel engine is giving out, it’s best to see a repair technician who can troubleshoot the problem or recommend a new engine from a used diesel engine supplier.

Where to Buy a Used Diesel Engine

If you have nonrepairable problems with your diesel engine, you don’t have to break the bank to find a new valuable option. Buying a used diesel engine can get your machine back to work in no time.

When you decide to buy used, it’s important to follow the tips in this guide to ensure you are getting the best deal possible.

Research suppliers, compare prices, observe external parts, and more to help you decide.

Tips to help find the best diesel engine for your situation

When purchasing a diesel engine, there are several key factors to consider to make sure the engine meets your operational needs and provides long-term value. Here’s a breakdown of the most important things to keep in mind:

1. Engine Power and Torque

• Horsepower (HP): The power output of the engine is critical, particularly for long-haul trucking. Depending on the type of loads and terrain, you'll want an engine that provides sufficient HP to handle your specific work. Most Class 7 and 8 diesel engines range from 350HP to 600 HP.
• Torque: Torque is what gets heavy loads moving, from a standstill. High torque is essential for trucks carrying heavy cargo or navigating hilly terrains. Aim for engines with torque between 1,200 to 2,050 lb-ft, depending on your load needs.
  
  

2. Fuel Efficiency

• Miles per Gallon (MPG): Diesel engines are typically more fuel-efficient than gasoline engines due to the higher compression ratio, but efficiency varies between models. Consider engines with high fuel efficiency, as this will reduce operating costs in the long run, particularly for long-distance hauls.
• Engine Technology: Newer engine technologies, such as turbocharging, direct injection, and variable valve timing, can significantly improve fuel efficiency.
  
  

3. Engine Reliability and Durability

• Brand Reputation: Research the reliability of different engine brands and models. Look for engines with a track record of durability, minimal breakdowns, and high-quality parts.
• Maintenance Requirements: Consider the maintenance schedule for the engine and whether parts are readily available. Some engines have longer service intervals, reducing downtime for maintenance.
• Service Support: Ensure that you have access to authorized service centers and mechanics trained to handle your engine model. Good after-sales support is essential for any engine purchase.
  
  

4. Emission Standards

• Compliance with Regulations: Diesel engines are subject to strict emissions regulations, particularly in North America and Europe. Make sure the engine complies with the latest emissions standards (e.g., EPA or Euro 6) to avoid fines and restrictions. Many modern engines are equipped with Selective Catalytic Reduction (SCR) and Diesel Particulate Filters (DPF) to meet these standards.
• Exhaust Gas Recirculation (EGR): Engines with EGR systems recirculate a portion of the exhaust gases to lower nitrogen oxide (NOx) emissions. Ensure the emission control system is reliable and doesn’t compromise performance.
• California – If your travels take you to California check the current emissions standards as they have strict laws. 
  
  

5. Total Cost of Ownership (TCO)

• Initial Price vs. Long-Term Cost: While the initial cost of the engine is important, also consider the long-term costs such as fuel consumption, maintenance, repair costs, and resale value.
• Warranty: Review the warranty offered on the engine, including coverage for major components. Extended warranties can be a worthwhile investment if you plan to keep the truck for a long time.
• Resale Value: Some engines retain their value better than others, particularly if they have a reputation for longevity and reliability.
  
  

6. Load Capacity and Hauling Needs

• Truck Configuration: The engine you choose should align with the truck’s configuration and the type of freight you haul. For heavy-duty applications like logging or oversized loads, opt for engines with higher torque and HP. For lighter loads, a smaller, more fuel-efficient engine might suffice.
• Type of Haul: Consider whether the engine is suited for long-haul, short-haul, or regional delivery. Long-haul trucks need engines optimized for sustained high-speed performance, while short-haul applications may benefit from better low-end torque and fuel efficiency in stop-and-go traffic.
  
  

7. Weight of the Engine

• Impact on Payload Capacity: The engine's weight will impact the overall payload capacity of the truck. Heavier engines might limit the amount of cargo you can legally carry, which could affect your revenue per haul.
  
  

8. Technological Features

• Telematics and Diagnostics: Many modern engines come with integrated telematics that allow you to monitor engine performance and diagnose issues in real-time. This can be useful for fleet managers and owners-operators to optimize performance and reduce downtime.
• Smart Technologies: Look for engines equipped with advanced fuel management systems, electronic control modules (ECMs), and adaptive driving features that enhance performance and fuel efficiency.
  
  

9. Engine Cooling and Heat Management

• Cooling Systems: Diesel engines generate significant heat, especially under heavy loads. An efficient cooling system will prevent overheating and ensure the engine performs optimally, even in tough conditions like long climbs or hot weather.
  
  

10. Resale Value and Longevity

• Engine Lifespan: Diesel engines typically last longer than gasoline engines, often exceeding 750,000 miles with proper maintenance. Consider the engine’s reputation for longevity and the ease with which it can be rebuilt or overhauled.
• Resale Value: Some engine brands have better resale value due to their reliability and brand reputation. This could be important if you plan to sell the truck down the line.  Keeping accurate maintenance logs of the work performed on your engine will help when considering selling your truck.
  
  

11. Manufacturer Support and Extended Warranties

• Dealer and Manufacturer Support: Choose an engine from a manufacturer with a strong support network for parts and services. This is especially important if your truck operates in remote locations where access to specific parts might be limited.
• Extended Warranties and Service plans: Investigate the availability of extended warranties or service plans, which can provide peace of mind for costly repairs down the road.
  
  

Common Diesel Engine Brands:

1. Cummins
2. Detroit Diesel
3. Caterpillar (CAT)
4. PACCAR (MX)
5. Volvo
6. Mack
   
   

Selecting the right diesel engine is crucial for both performance and cost-efficiency. Make sure to evaluate the engine based on your specific needs—whether you're focused on long-distance hauls, heavy loads, or maximizing fuel economy.

At River City Truck Parts our experienced team is ready to help you find the right engine for your situation. 

Search our engine inventory or contact us to get started with one our parts specialists.

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