6.7 Cummins Rebuild Cost: What to Expect and Key Details

Are you planning to rebuild your 6.7 Cummins diesel engine? Find out the average cost and the factors that affect it in our comprehensive guide.

The average 6.7 Cummins rebuild cost ranges from $4,000 to $8,000, depending on factors such as labor, parts, and additional expenses like fluids, filters, and shipping.

As we dive into the of 6.7 Cummins rebuild costs, you’ll uncover valuable insights to help you navigate your engine’s transformation with ease and efficiency.

Factors Influencing the Rebuild Cost

Here are some of the main factors that affect the cost of 6.7 Cummins Rebuild:

1. Labor costs. The expertise of the mechanic or the repair shop you choose will impact the labor cost. A more experienced mechanic may charge a higher hourly rate, but their efficiency could save you money in the long run. Similarly, labor costs can influence the price of rebuilding a Harley engine.
2. Parts quality. Choosing between OEM, aftermarket, or remanufactured parts can greatly affect the rebuild cost. OEM parts tend to be more expensive, while aftermarket and remanufactured parts can be more cost-effective but may vary in quality. This factor also plays a role in rebuilding a Ford 302 engine.
3. Rebuild method. A DIY rebuild can save on labor costs, but it requires mechanical expertise and access to the right tools. A professional rebuild may cost more, but it ensures a high level of workmanship and a warranty on the job.
4. Additional expenses. Fluids, filters, and shipping costs for parts are factors to consider in the overall rebuild cost. Core charges may also apply if you’re purchasing remanufactured components.
5. Extent of rebuild. A partial rebuild or replacing only specific components can lower the cost. However, a complete rebuild ensures maximum engine longevity and performance.

Cost Breakdown

Parts Costs

Understanding the differences between OEM, aftermarket, and remanufactured components is crucial when estimating your rebuild cost. Let’s explore the pros and cons of each type of part.

OEM (Original Equipment Manufacturer) parts are made by the same company that produced the original parts for the engine. They tend to be more expensive but guarantee a perfect fit and higher quality. Aftermarket parts are made by third-party companies and are generally less expensive, but quality can vary depending on the manufacturer.

Remanufactured components are used parts that have been restored to like-new condition. They are typically more affordable than new parts and offer a reliable option for those on a tighter budget.

Labor Costs

Labor costs are a significant part of the overall rebuild expense. In this section, we’ll discuss how hourly rates and the timeframe for completion can impact your total costs.

Hourly Rates: Labor costs vary depending on the expertise of the mechanic or the repair shop. Hourly rates can range from $80 to $150, with more experienced mechanics charging higher rates. However, their efficiency and expertise may save you money in the long run.

Timeframe for Completion: The time required to complete a rebuild can vary, but on average, it can take anywhere from 40 to 60 hours. Keep in mind that a quicker turnaround may come at a premium labor rate.

Additional Expenses

Aside from parts and labor, there are other expenses to consider when planning a 6.7 Cummins engine rebuild. We’ll cover essential items such as fluids and filters, shipping fees, and potential core charges.

Fluids and Filters. New fluids and filters are required during a rebuild. The cost for engine oil, coolant, and filters can range from $150 to $300.

Shipping Fees. If you need to order parts online, shipping fees can add to the overall cost. These fees can vary depending on the weight, size, and destination of the shipment.

Potential Core Charges. When purchasing remanufactured components, you may encounter core charges. These are refundable fees that encourage customers to return used parts for remanufacturing. Core charges typically range from $50 to $500, depending on the component.

Rebuild Options

1. DIY (Do-It-Yourself) Rebuild

Undertaking a DIY rebuild can save on labor costs, but it requires mechanical expertise and access to the right tools. The tools and equipment needed include an engine stand, torque wrench, and various specialized tools for removing and reinstalling engine components. 

On average, a DIY 6.7 Cummins rebuild cost may range from $2,000 to $4,000, depending on the parts and materials used.

Jeep 4.0 engine rebuilds, for example, can also be approached through DIY or professional rebuild methods.

2. Professional Rebuild

Choosing a professional rebuild ensures a high level of workmanship, expertise, and often includes a warranty on the job. The key factor here is selecting the right shop specializing in Cummins engine rebuilds with a solid reputation. 

The approximate cost for a professional 6.7 Cummins rebuild ranges from $4,000 to $8,000, depending on the labor rates, parts used, and the extent of the rebuild.

Components Involved in a 6.7 Cummins Rebuild

1. Engine block. The engine block houses the cylinders and is the foundation of the rebuild. It may need to be cleaned, inspected, or machined to ensure proper fitment of new components.
2. Pistons and rings. Worn pistons and rings contribute to reduced compression and increased oil consumption. Replacing them is essential to restore engine performance.
3. Connecting rods and bearings. Connecting rods link the pistons to the crankshaft, while bearings reduce friction between the components. Replacing these parts ensures smooth operation and longevity.
4. Cylinder head. The cylinder head contains the combustion chambers and valvetrain components. It may need to be resurfaced, pressure tested, or replaced to ensure a proper seal and optimal performance.
5. Valvetrain components. The valvetrain, including camshafts, lifters, and rocker arms, controls the opening and closing of the valves. These components must be inspected for wear and replaced if necessary.
6. Crankshaft and bearings. The crankshaft converts the reciprocating motion of the pistons into rotational motion. Bearings reduce friction between the crankshaft and the engine block. Both components should be inspected and replaced as needed.
7. Gaskets and seals. Gaskets and seals prevent fluid leaks and maintain proper compression within the engine. They must be replaced during the rebuild process to ensure a reliable and leak-free engine.
8. Turbocharger (if applicable): The turbocharger increases engine power by forcing more air into the combustion chambers. It should be inspected for wear and damage, and rebuilt or replaced if necessary.

Here’s a table with specific cost examples for each component involved in a 6.7 Cummins rebuild. Please note that these prices are approximate and may vary depending on the brand, quality, and source of the parts.

Remember that these are just examples. Actual costs may vary depending on the supplier, brand, and market conditions. It is always a good idea to shop around and compare prices to get the best deal for your rebuild.

FAQs

Is it worthwhile to rebuild a diesel engine?

Rebuilding a diesel engine can be worthwhile if it significantly extends the engine’s lifespan and improves performance, often at a lower cost than replacing the entire engine.

How long will a 6.7 Cummins engine last?

A well-maintained 6.7 Cummins engine can last between 350,000 and 500,000 miles before requiring significant repairs or rebuilds.

What is excessive mileage on a Cummins?

Excessive mileage on a Cummins engine varies, but generally, anything over 300,000 miles is considered high mileage and may require more frequent maintenance or repairs.

Which Cummins engine is the best to swap?

The best Cummins engine to swap depends on your specific needs, but the 5.9L 12-valve Cummins from the 1994-1998 Dodge Ram trucks is popular for its simplicity, reliability, and ease of modification.