A-Premium Serpentine Belt Drive Kit with Tensioner for Kenworth & Peterbilt Heavy-Duty Trucks
A-Premium Heavy-Duty Serpentine Belt and Tensioner Kit – Restore Reliable Accessory Drive Performance
When you’re operating a heavy-duty diesel truck, an unexpected serpentine belt failure can mean more than an inconvenient repair. It can lead to costly downtime, missed deliveries, overheating, and loss of critical engine accessory operation.
The A-Premium Engine Serpentine Belt Drive Kit with Tensioner provides a convenient replacement solution for select Kenworth and Peterbilt commercial trucks equipped with compatible 11.9L, 14.9L, and 15.0L inline-six engines.
This two-piece kit includes a replacement serpentine belt and matching belt tensioner, allowing technicians and fleet operators to service two important components of the engine accessory drive system together.
Designed for specific fan, alternator, and water pump drive configurations, the kit helps restore dependable belt tension, pulley engagement, and accessory operation.
Whether you’re maintaining a Kenworth T800, W900, W990, or a Peterbilt 365, 379, 388, 389, or 567, this A-Premium kit offers a practical solution for compatible heavy-duty truck applications.
Key Features and Benefits
- Complete Two-Piece Drive Kit: Includes one serpentine belt and one belt tensioner.
- Heavy-Duty Truck Compatibility: Designed for select Kenworth and Peterbilt commercial truck applications.
- 11.9L, 14.9L and 15.0L Engine Applications: Supports specified inline-six diesel and CNG engine configurations.
- Reliable Belt Tension: Replacement tensioner helps maintain proper belt engagement under changing engine loads.
- Stable Accessory Drive Operation: Supports compatible engine fan, alternator, and water pump drive systems.
- Convenient Combined Replacement: Allows technicians to replace the belt and tensioner during the same maintenance service.
- Reduced Unplanned Downtime: Preventive replacement can help lower the risk of unexpected accessory drive failures.
- Application-Specific Fitment: Designed for particular engine and accessory configurations rather than universal installation.
- Warranty Coverage: Backed by A-Premium’s stated one-year, unlimited-mileage guarantee.
A-Premium Serpentine Belt Kit Vehicle Fitment
Kenworth Heavy-Duty Truck Applications
| Year | Make | Model | Engine | Drive Application |
|---|---|---|---|---|
| 2009 | Kenworth | T800 | 14.9L L6 Diesel | Fan, alternator and water pump; 91⅝-inch belt outside circumference |
| 2008–2010 | Kenworth | W900 | 14.9L L6 Diesel | Fan |
| 2019–2021 | Kenworth | W900 | 14.9L L6 Diesel | Fan and alternator |
| 2020 | Kenworth | W990 | 14.9L L6 Diesel | Fan and alternator |
Peterbilt Heavy-Duty Truck Applications
| Year | Make | Model | Engine | Drive Application |
|---|---|---|---|---|
| 2013 | Peterbilt | 365 | 11.9L L6 Diesel | Fan |
| 2003 | Peterbilt | 379 | 14.9L L6 Diesel | Fan |
| 2008 | Peterbilt | 388 | 14.9L L6 Diesel | Fan |
| 2012–2013 | Peterbilt | 388 | 14.9L L6 Diesel | Fan |
| 2012 | Peterbilt | 388 | 15.0L L6 CNG | Fan |
| 2008–2011 | Peterbilt | 389 | 14.9L L6 Diesel | Fan |
| 2013–2015 | Peterbilt | 389 | 14.9L L6 Diesel | Fan |
| 2015 | Peterbilt | 567 | 14.9L L6 Diesel | Fan |
Important Fitment Note: These applications reflect the supplied A-Premium fitment information. Compatibility depends on the truck’s engine, accessory drive arrangement, and original belt and tensioner specifications.
The 2009 Kenworth T800 application specifically requires a belt with a 91⅝-inch outside circumference. This dimension should not automatically be applied to every other truck listed.
Heavy-duty trucks frequently use different belt routing and accessory configurations even within the same model year and engine family. Verify the original equipment belt and tensioner references before ordering.
$37.49
A-Premium Serpentine Belt and Tensioner Kit Specifications
| Specification | Details |
|---|---|
| Brand | A-Premium |
| Product Type | Serpentine Belt Drive Kit |
| Belt Quantity | 1 |
| Tensioner Quantity | 1 |
| Total Components | 2 |
| Vehicle Class | Heavy-Duty Commercial Trucks |
| Compatible Makes | Kenworth, Peterbilt |
| Engine Displacements | 11.9L, 14.9L, 15.0L |
| Engine Configuration | Inline-6 |
| Fuel Types | Diesel; select CNG |
| Drive Applications | Fan, alternator, water pump, depending on vehicle |
| Special Belt Dimension | 91⅝-inch outside circumference for specified 2009 Kenworth T800 |
| Warranty | 1 year, unlimited mileage |
Why Replace the Serpentine Belt and Tensioner Together?
A serpentine belt and its tensioner work together to maintain reliable power transfer between the engine crankshaft and belt-driven accessories.
The belt transfers rotational force, while the tensioner helps maintain appropriate belt tension as engine speed and accessory loads change.
When the belt becomes worn, it may begin slipping, vibrating, or making noise.
However, installing a new belt without addressing a weak or worn tensioner may not solve the original problem.
A failing tensioner can cause:
- Inconsistent belt tension
- Belt slipping under load
- Excessive vibration
- Premature belt wear
- Chirping or squealing noises
- Belt tracking problems
- Unexpected accessory drive failure
Replacing both components during the same service can help restore proper belt operation and reduce the chance of repeated maintenance.
Why Serpentine Belt Reliability Matters for Heavy-Duty Trucks
Commercial truck engines operate for extended periods under demanding conditions.
High engine loads, temperature changes, vibration, and long operating hours place considerable stress on accessory drive components.
Depending on the truck’s engine configuration, the serpentine belt may drive:
- Engine cooling fan
- Alternator
- Water pump
- Other belt-driven engine accessories
A failed accessory drive belt can disable critical components and potentially leave the truck stranded.
For fleet operators and owner-operators, this can result in unexpected roadside repairs, missed delivery schedules, and lost operating time.
Replacing aging accessory drive components before they fail is an important part of preventive truck maintenance.
If you’re troubleshooting low charging voltage or an alternator warning, our guide to testing alternator output with a multimeter explains the fundamentals of charging-system diagnosis. Heavy-duty electrical systems may use different nominal voltages and testing specifications, so always follow the truck manufacturer’s service information.
Signs Your Kenworth or Peterbilt Belt Drive Needs Service
Heavy-duty serpentine belts and tensioners experience repeated mechanical stress during normal truck operation.
Common warning signs include:
- Squealing or chirping from the engine accessory drive
- Visible cracks, fraying, or damaged belt ribs
- Glazed or polished belt surfaces
- Excessive tensioner arm movement
- Rough or noisy pulley bearings
- Belt tracking or alignment problems
- Charging system warnings
- Engine cooling problems on belt-driven cooling systems
- Repeated premature belt failures
These symptoms may also indicate worn pulleys, damaged bearings, or accessory problems.
Inspecting the complete belt drive system helps identify the actual cause before replacing components.
Engine Fan, Alternator, and Water Pump Drive Applications Explained
Not every Kenworth or Peterbilt engine uses the same serpentine belt configuration.
Some applications use a belt dedicated to the engine fan, while others combine multiple accessories into a shared drive system.
Fan Drive Applications
On specified trucks, the belt transfers power to the engine cooling fan drive system.
Correct belt tension and pulley alignment are essential for reliable operation.
Fan and Alternator Applications
Some Kenworth W900 and W990 configurations use a belt that drives both the engine fan and alternator.
A belt failure in these applications can affect both cooling-related operation and electrical charging.
Fan, Alternator, and Water Pump Applications
The specified 2009 Kenworth T800 configuration includes a belt drive for the fan, alternator, and water pump.
Because these accessories are important to engine reliability, correct belt selection and installation are especially important.
Always verify the exact drive arrangement before ordering replacement components.
How to Replace a Heavy-Duty Truck Serpentine Belt and Tensioner
Replacing the serpentine belt and tensioner on a commercial truck requires the correct service procedures and suitable tools.
Before beginning, identify the belt routing, tensioner mounting arrangement, and manufacturer torque specifications.
General Replacement Procedure
- Park the truck securely, shut down the engine, and follow the manufacturer’s lockout and safety procedures.
- Allow the engine and cooling components to cool.
- Identify the original belt routing and accessory drive configuration.
- Inspect the belt, tensioner, idler pulleys, and accessory bearings.
- Release belt tension using the correct service procedure.
- Remove the worn serpentine belt.
- Remove the original belt tensioner according to manufacturer instructions.
- Compare the replacement tensioner and belt with the original components.
- Install the new tensioner using the correct mounting procedure and torque specifications.
- Route the replacement serpentine belt around the appropriate pulleys.
- Verify that the belt is properly seated and aligned.
- Restore tension and inspect the completed installation before returning the truck to service.
Safety Warning: Heavy-duty engine cooling fans and belt tensioners can cause serious injury. Never work near rotating components, and never assume an electronically controlled fan cannot engage unexpectedly.
For additional belt replacement principles and installation precautions, explore our serpentine belt replacement guide.
Why Choose an A-Premium Belt and Tensioner Kit?
A-Premium offers aftermarket replacement components designed for a variety of automotive and commercial vehicle applications.
This serpentine belt drive kit combines two related maintenance components into a single package, making it convenient for technicians and fleet maintenance departments.
The kit is particularly useful when the existing belt shows wear and the tensioner has become noisy, unstable, or weak.
Its stated one-year, unlimited-mileage guarantee provides additional purchase protection, subject to A-Premium’s warranty terms.
Buy an A-Premium Heavy-Duty Serpentine Belt Kit at Pro Street Online
Keep your Kenworth or Peterbilt operating reliably with the A-Premium Engine Serpentine Belt Drive Kit with Tensioner.
Designed for select 11.9L, 14.9L, and 15.0L heavy-duty truck applications, this two-piece kit provides replacement components for compatible fan, alternator, and water pump drive configurations.
Shop commercial truck maintenance components, replacement engine belts, and automotive parts at Pro Street Online.
Specification: A-Premium Serpentine Belt Drive Kit with Tensioner for Kenworth & Peterbilt Heavy-Duty Trucks
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