1986 International COF-9670 Overview, Reviews, Ratings & Specs
The 1986 International COF-9670 is a heavy-duty truck, primarily known for its robust construction and suitability for long-haul trucking and commercial applications. As part of International Harvester's COF series, it represents a lineage of reliable workhorses. While specific trims are less defined than in passenger cars, variations typically centered on powertrain and chassis configurations. New pricing would have been substantial, reflecting its commercial nature, and used prices vary widely based on condition and mileage.
The Good
The 1986 International COF-9670 excels in raw power and steadfast reliability, built for demanding work. Its no-nonsense design appeals to those who value functionality over flash. For practical buyers, its durability translates to long-term value; emotionally, it evokes a sense of dependable strength.
The Bad
Potential buyers should be aware of common issues like aging fuel systems, wear and tear on drivetrain components, and potential for rust, especially in critical structural areas. The older technology might also mean a less refined driving experience and fewer modern amenities. Overheating can also be a concern if the cooling system isn't meticulously maintained.
1986 International COF-9670: Quick Overview
- Engine Options: The 1986 International COF-9670 was typically equipped with powerful diesel engines designed for heavy-duty applications. Common options included Cummins NTC series engines (e.g., NTC 350) and potentially other large displacement diesels from manufacturers like Caterpillar or Detroit Diesel, depending on the specific configuration ordered by the fleet or owner. These engines were known for their torque and longevity.
- Horsepower: Horsepower ratings varied significantly based on the specific engine chosen. Cummins NTC 350, for instance, would produce around 350 horsepower. Other available engine configurations could range from approximately 300 horsepower to well over 400 horsepower for specialized heavy-haul applications.
- Fuel Economy: Fuel economy for trucks of this era and class is not directly comparable to passenger vehicles and is highly dependent on load, terrain, and driving style. Expect figures in the range of 4-7 miles per gallon (MPG) under optimal conditions for highway cruising with a moderate load.
- 0-60 Times: 0-60 mph acceleration times are largely irrelevant and impractical to measure for this class of vehicle. These trucks are designed for sustained cruising at highway speeds and for moving heavy loads, not for rapid acceleration.
- Towing Capacity: The towing capacity of the 1986 International COF-9670 is immense, designed for Class 8 applications. This could range from 80,000 pounds Gross Combination Weight Rating (GCWR) for standard applications to well over 100,000 pounds (or even higher) for specialized heavy-haul configurations. This capacity depends heavily on the chassis, suspension, drivetrain, and specific trailer setup.
- Trim-Level Features: As a commercial truck, "trims" were less about luxury packages and more about functional configurations. Key differentiating features included:
- Engine and Transmission Choices: Various diesel engines and manual or automatic transmissions (e.g., Eaton Fuller 10-speed, 13-speed, 18-speed manual transmissions).
- Axle Configurations: Single, tandem, or tridem rear axles for increased load-bearing capabilities.
- Suspension Systems: Different types of suspension (e.g., spring, air-ride) tailored for specific hauling needs.
- Cab Options: Day cabs (minimal living space, for shorter routes) or sleeper cabs (offering sleeping quarters for long-haul drivers).
- Wheelbase and Frame Lengths: Varied to accommodate different trailer types and cargo configurations.
- Braking Systems: Air brakes were standard, with options for anti-lock braking systems (ABS) in later iterations or as an option.
1986 International COF-9670 Specifications
Vehicle Information
| Year | 1986 |
| Make | International |
| Model | COF-9670 |
| Trim | - |
| Style | - |
| Type | Truck |
| Category | Heavy Truck |
Manufacturing Details
| Made In | United States |
| Manufacturing City | SPRINGFIELD |
Dimensions
| Doors | - |
| Curb Weight | - |
| Gross Vehicle Weight Rating | 33001 pounds |
| Overall Height | - |
| Overall Length | - |
| Overall Width | - |
| Wheelbase Length | - |
| Standard Seating | - |
Engine & Performance
| Engine | 14L I6 |
| Engine Size | 14L |
| Engine Cylinders | 6 |
| Transmission | - |
| Transmission Type | - |
| Transmission Speeds | - |
| Drivetrain | 6x4 |
Additional Features
| Anti-Brake System | - |
| Steering Type | - |
Pricing
| Manufacturer Suggested Retail Price (MSRP) | - |
| Invoice Price | - |
| Delivery Charges | - |
Vehicle History Report
Vehicle
Specifications
Specifications
Ownership
History
History
All History
Events
Events
NMVTIS Title
History Check
History Check
Salvage/Rebuilt
Check
Check
Accident
Check
Check
Theft
Check
Check
Open Lien
Check
Check
Past Sale
Listings
Listings
Safety
Recalls
Recalls
Odometer
Check
Check
Market Price
Analysis
Analysis
What Problems Does the 1986 International COF-9670 Have?
The 1986 International COF-9670, being a commercial vehicle from that era, is generally built for durability. However, like any vehicle, it has common areas of wear and potential issues that can arise with age and mileage. Frequently reported concerns often revolve around the powertrain, particularly the diesel engines and their associated fuel systems. Injectors, fuel pumps, and turbochargers can require attention over time. Seals and gaskets in engines and transmissions are also prone to age-related degradation, leading to leaks.
The cooling system is another area to watch. Over time, radiators can clog or develop leaks, and water pumps can fail. This can lead to overheating, which is particularly detrimental to large diesel engines. The exhaust system, including mufflers and exhaust manifolds, can also experience corrosion and wear.
Drivetrain components such as the driveshaft, U-joints, and differential can show wear, especially under heavy use. Clutch and transmission wear are also common, particularly with frequent stop-and-go driving or heavy hauling. The air brake system, while robust, requires regular inspection and maintenance to ensure optimal performance and safety.
Regarding recalls, specific recall information for individual model years of the COF-9670 would typically be registered with the National Highway Traffic Safety Administration (NHTSA). However, given its age, many of these would have been addressed or are no longer active. For long-term reliability, the key lies in consistent and thorough maintenance. Trucks that have been regularly serviced according to manufacturer recommendations, with fluid changes, filter replacements, and proactive component checks, tend to be far more reliable. Neglected maintenance is the primary driver of significant problems in these heavy-duty vehicles. Issues can also be more prevalent in trucks that have been subjected to extreme operating conditions or overloaded.
Model year specific issues are less commonly documented in the same way as consumer vehicles. However, advancements in engine management systems and emissions controls, while minimal in 1986 compared to today, did evolve. Any issues related to these earlier electronic systems, if present, would be a consideration. Overall, the COF-9670's reliability hinges heavily on its maintenance history and the specific components fitted during its manufacturing.
The cooling system is another area to watch. Over time, radiators can clog or develop leaks, and water pumps can fail. This can lead to overheating, which is particularly detrimental to large diesel engines. The exhaust system, including mufflers and exhaust manifolds, can also experience corrosion and wear.
Drivetrain components such as the driveshaft, U-joints, and differential can show wear, especially under heavy use. Clutch and transmission wear are also common, particularly with frequent stop-and-go driving or heavy hauling. The air brake system, while robust, requires regular inspection and maintenance to ensure optimal performance and safety.
Regarding recalls, specific recall information for individual model years of the COF-9670 would typically be registered with the National Highway Traffic Safety Administration (NHTSA). However, given its age, many of these would have been addressed or are no longer active. For long-term reliability, the key lies in consistent and thorough maintenance. Trucks that have been regularly serviced according to manufacturer recommendations, with fluid changes, filter replacements, and proactive component checks, tend to be far more reliable. Neglected maintenance is the primary driver of significant problems in these heavy-duty vehicles. Issues can also be more prevalent in trucks that have been subjected to extreme operating conditions or overloaded.
Model year specific issues are less commonly documented in the same way as consumer vehicles. However, advancements in engine management systems and emissions controls, while minimal in 1986 compared to today, did evolve. Any issues related to these earlier electronic systems, if present, would be a consideration. Overall, the COF-9670's reliability hinges heavily on its maintenance history and the specific components fitted during its manufacturing.
How long will the 1986 International COF-9670 last?
The 1986 International COF-9670 is built for longevity, and many units have exceeded 1 million miles with proper care. Average mileage can vary drastically, but it's not uncommon for these trucks to accumulate 100,000 to 150,000 miles per year in commercial service. With diligent maintenance, including regular oil changes, filter replacements, and proactive component checks, these vehicles can remain in service for 15-25 years, or even longer. The long-term durability of the chassis and major powertrain components (engine block, transmission case) is a significant strength. However, weaknesses emerge over time with wear-and-tear items such as fuel injectors, turbochargers, cooling system components, and electrical connections. The frames are generally robust, but rust can become an issue in certain climates, affecting structural integrity over extended periods. Cab components and interior finishes are also subject to the ravages of time and use.
What Technology & Safety Features are Included?
The 1986 International COF-9670, as a commercial heavy-duty truck of its era, was not designed with the extensive technology, entertainment, or driver-assistance features found in modern passenger vehicles. Its focus was squarely on utilitarian function and operational efficiency.
Built-in Tech: The technology onboard would have been basic, centered around instrumentation and vehicle operation. This included analog gauges for speed, RPM, fuel level, oil pressure, coolant temperature, and air brake pressure. A basic radio/cassette player was often the extent of the entertainment system. Diagnostics were largely mechanical or relied on simple indicator lights.
Entertainment: Entertainment options were minimal. A factory-installed AM/FM radio with a cassette player was common. Some might have had aftermarket additions like CB radios. For long-haul drivers, the primary form of entertainment was often brought from home, such as portable music players.
Driver-Assistance Features: Driver-assistance features were virtually non-existent. Cruise control might have been an option on some models, but advanced systems like lane departure warnings, adaptive cruise control, or automatic emergency braking were not available. The driver was expected to be fully engaged in operating the vehicle.
Safety Features: Safety features were primarily passive and mechanical. The core safety relied on the robust construction of the chassis and cab, designed to withstand significant forces. Air brakes were the standard braking system, offering substantial stopping power for a heavy vehicle, though anti-lock braking systems (ABS) were in their infancy and not universally standard. Seat belts were present, as required by law. Visibility was generally good due to the large cab windows and mirrors. However, modern safety aids like airbags, advanced crumple zones, or sophisticated electronic stability control were not features of this truck. Crash-test ratings for commercial trucks of this vintage are not typically available in the same format as for passenger cars, as they are subjected to different testing protocols and focus on structural integrity under heavy loads and different impact scenarios. The emphasis was on occupant protection through sheer structural strength and robust mechanical systems.
Built-in Tech: The technology onboard would have been basic, centered around instrumentation and vehicle operation. This included analog gauges for speed, RPM, fuel level, oil pressure, coolant temperature, and air brake pressure. A basic radio/cassette player was often the extent of the entertainment system. Diagnostics were largely mechanical or relied on simple indicator lights.
Entertainment: Entertainment options were minimal. A factory-installed AM/FM radio with a cassette player was common. Some might have had aftermarket additions like CB radios. For long-haul drivers, the primary form of entertainment was often brought from home, such as portable music players.
Driver-Assistance Features: Driver-assistance features were virtually non-existent. Cruise control might have been an option on some models, but advanced systems like lane departure warnings, adaptive cruise control, or automatic emergency braking were not available. The driver was expected to be fully engaged in operating the vehicle.
Safety Features: Safety features were primarily passive and mechanical. The core safety relied on the robust construction of the chassis and cab, designed to withstand significant forces. Air brakes were the standard braking system, offering substantial stopping power for a heavy vehicle, though anti-lock braking systems (ABS) were in their infancy and not universally standard. Seat belts were present, as required by law. Visibility was generally good due to the large cab windows and mirrors. However, modern safety aids like airbags, advanced crumple zones, or sophisticated electronic stability control were not features of this truck. Crash-test ratings for commercial trucks of this vintage are not typically available in the same format as for passenger cars, as they are subjected to different testing protocols and focus on structural integrity under heavy loads and different impact scenarios. The emphasis was on occupant protection through sheer structural strength and robust mechanical systems.
What Colors Options are Available?
We’re working on this section!
In the meantime, feel free to explore the other sections for more content.
In the meantime, feel free to explore the other sections for more content.
1986 International COF-9670 Prices and Market Value
When new, the 1986 International COF-9670 would have commanded a significant price, likely ranging from $50,000 to over $100,000 depending on the specific configuration, engine, transmission, and any specialized equipment. This was a serious commercial investment. Currently, used prices for the 1986 International COF-9670 vary enormously. Well-maintained examples in good running condition can fetch anywhere from $5,000 to $20,000 or more, particularly if they are classic trucks or in excellent original condition. Trucks needing significant work or with very high mileage might be available for $2,000 to $5,000. Depreciation was less of a factor in the traditional sense for these workhorses; their value was tied to their operational utility. Resale value is heavily influenced by maintenance history, current mechanical condition, mileage, tire condition, interior wear, and the presence of any rust or structural damage. Trucks that have been used in demanding commercial roles may depreciate more rapidly than those used for lighter duty or preserved as classics.
1986 International COF-9670 Cost of Ownership
Owning a 1986 International COF-9670 is generally not economical in the same vein as a passenger car. Insurance will be higher, often requiring commercial policies. Fuel costs are substantial due to its large diesel engine, with MPG typically in the 4-7 range. Maintenance is crucial and can be costly, involving specialized diesel mechanics. Repairs, especially for major powertrain components, are expensive. Long-term ownership costs are significant, driven by fuel consumption, preventative maintenance, and the potential for costly repairs as components age. While its initial purchase price might be low on the used market, the ongoing operational and maintenance expenses make it a costly vehicle to own and operate, primarily suited for commercial or dedicated enthusiast use.
1986 International COF-9670 Fuel Efficiency
Fuel Type
Diesel
Fuel Capacity
-
City Mileage
-
Highway Mileage
-
1986 International COF-9670 Warranty
Basic
Original warranty
0 months / No data
Estimated remaining
Expired
Powertrain
Original warranty
0 months / No data
Estimated remaining
Expired
Rust
Original warranty
0 months / No data
Estimated remaining
Expired
1986 International COF-9670 Insurance
Insurance for a 1986 International COF-9670 is moderately priced, reflecting its status as a Truck with strong safety ratings and
reasonable repair costs.
reasonable repair costs.
How Does the 1986 International COF-9670 Compare to Other Truck?
The 1986 International COF-9670 competed in the heavy-duty Class 8 truck market against formidable rivals from manufacturers like Freightliner, Kenworth, Peterbilt, and Mack. In terms of performance, the COF-9670 was generally on par with its peers, offering robust diesel engines and heavy-duty drivetrains. Specific engine choices (Cummins, Caterpillar, Detroit Diesel) would influence horsepower and torque characteristics, with each brand offering comparable options. Reliability was a shared characteristic among these trucks; they were built for relentless operation. However, individual reliability often depended more on the specific engine and transmission combination and, crucially, the maintenance regimen rather than the brand itself. In the mid-80s, features were very utilitarian across the board. Driver comfort was improving, with sleeper cabs becoming more common and suspension systems offering a smoother ride than in previous decades, but advanced technology was minimal across all brands. Pricing when new was competitive within the segment, with differences often dictated by specific options and configurations.
Similar Alternatives:
Better Alternatives (depending on specific needs):
For a buyer looking for potentially more modern features or specific technological advantages (though still within the context of older trucks), later model year versions of these competing brands might offer marginal improvements. However, for a truck built for pure, unadulterated workhorse capability and durability in 1986, the COF-9670 stood as a solid choice. There isn't a definitively "better" alternative in the same model year that fundamentally eclipses it without specific application needs or brand preference. The choice between these trucks often came down to dealer support, specific powertrain preferences, and driver ergonomics.
Similar Alternatives:
- Freightliner FLD Series: A strong competitor known for its aerodynamic design and reliable performance.
- Kenworth T600A / W900: Iconic trucks known for their build quality, driver comfort, and strong resale value.
- Peterbilt 379: Another highly regarded truck, often favored for its distinctive styling and robust construction.
- Mack CH Series: Known for their durability and often equipped with Mack's own powerful engines.
Better Alternatives (depending on specific needs):
For a buyer looking for potentially more modern features or specific technological advantages (though still within the context of older trucks), later model year versions of these competing brands might offer marginal improvements. However, for a truck built for pure, unadulterated workhorse capability and durability in 1986, the COF-9670 stood as a solid choice. There isn't a definitively "better" alternative in the same model year that fundamentally eclipses it without specific application needs or brand preference. The choice between these trucks often came down to dealer support, specific powertrain preferences, and driver ergonomics.
Final Verdict: Is the 1986 International COF-9670 a Good Truck?
The 1986 International COF-9670 is ideal for individuals or businesses requiring a rugged, no-frills heavy-duty truck for commercial hauling, restoration projects, or even as a platform for unique builds. It is worth buying for those who understand and can manage the maintenance demands of an older diesel. It is not suitable for daily commuting or for buyers seeking modern comfort, technology, or fuel efficiency.
Purchasing this vehicle is best done on the used market. Look for examples with a documented maintenance history, preferably with newer engine components or a well-rebuilt powertrain. Day cabs are more basic, while sleeper cabs offer more for long-haul applications. Avoid trucks with significant rust or known major mechanical issues unless you are prepared for extensive, costly repairs. For the right buyer with specific needs and a realistic understanding of its operational requirements, the COF-9670 can be a dependable, albeit demanding, workhorse.
Purchasing this vehicle is best done on the used market. Look for examples with a documented maintenance history, preferably with newer engine components or a well-rebuilt powertrain. Day cabs are more basic, while sleeper cabs offer more for long-haul applications. Avoid trucks with significant rust or known major mechanical issues unless you are prepared for extensive, costly repairs. For the right buyer with specific needs and a realistic understanding of its operational requirements, the COF-9670 can be a dependable, albeit demanding, workhorse.
Eugene S
Eugene is an automotive enthusiast with over 15 years of experience in the used car market. As a writer at VINCheck.info, he brings deep industry insight and a passion for cars, helping readers make smart, informed decisions. Eugene has written hundreds of used car reviews and is known for breaking down complex automotive topics into clear, actionable advice. Over the years, he has driven and worked on a wide range of vehicles—starting with tuning street cars in his early days and eventually focusing on performance upgrades and reliability improvements. Today, he specializes in evaluating used vehicles through the lens of real-world ownership and enthusiast needs. A longtime fan of Porsche, Eugene especially appreciates vehicles that blend durability with driving enjoyment.