null

Kenworth Engine Parts & Cooling

Optimize your truck's operation with exceptional Kenworth engine cooling parts from 4 State Trucks. Browse through our selection of Radiators, Charge Air Coolers, Fan Shrouds, Filters, and Transmission Coolers to address all your truck's needs. Rely on 4 State Trucks for premium products that ensure your truck runs smoothly and efficiently.
  • Product
  • Qty in Cart
  • Quantity
  • Price
  • Subtotal
  • BESTfit Cummins 5.9 L Flywheel 3921264, 3901395, 3900269

    BESTfit Cummins 5.9 L Flywheel 3921264, 3901395, 3900269

    BESTFIT TRUCK PARTS

    $257.99
    BESTfit Cummins Flywheels B Series - 5.9L SAE #2* High Quality Flywheel* Fits Cummins Flywheels B Series - 5.9L* Flat Design* 8 Bolt Mounting Holes* Size: SAE #2 * 14 Inch Clutch Size* 17 Inch OD...
    29-0733921263
    SKU:
    29-0733921263
    Truck Class:
    Heavy Duty
    Make:
    Universal Items
    Product Type:
    Engine Parts
    Style Options:
    Flat
    Diameter Options:
    17 Inch
    $257.99
    Qty in Cart: 0
    Price:
    $257.99
    Subtotal:
  • BESTfit Front Sump Oil Pan Gasket For Cummins N14

    BESTfit Front Sump Oil Pan Gasket For Cummins N14

    BESTFIT TRUCK PARTS

    $20.59
    BESTfit Front Sump Oil Pan Gasket* High Quality Oil Pan Gasket* Fits Cummins Front Sump N14 Oil Pan* Sold Individually* Warranty On Oil Pan Gaskets Against Defects In Workmanship & Material From Date...
    29-073032861
    SKU:
    29-073032861
    Truck Class:
    Heavy Duty
    Make:
    Universal Items
    Product Type:
    Engine Parts
    Style Options:
    Cummins
    $20.59
    Qty in Cart: 0
    Price:
    $20.59
    Subtotal:
  • 9 Gallon Steel Rear Sump Oil Pan For Cummins NT855 Big Cam III, IV & N14

    9 Gallon Steel Rear Sump Oil Pan For Cummins NT855 Big Cam III, IV & N14

    AUTOMANN USA

    $460.99
    9 Gallon Steel Rear Sump Oil PanExtend the life of your Cummins engine with this high-quality 9 Gallon Steel Rear Sump Oil Pan, compatible with NT855 Big Cam III, IV, and N14 models. Designed with a...
    29-073031959
    SKU:
    29-073031959
    Truck Class:
    Heavy Duty
    Make:
    Universal Items
    Product Type:
    Engine Parts
    $460.99
    Qty in Cart: 0
    Price:
    $460.99
    Subtotal:
  • FREE SHIPPING OVER $249
    BESTfit EZ Oil Drain Valve 1 Inch-18 UNF

    BESTfit EZ Oil Drain Valve 1 Inch-18 UNF

    BESTFIT TRUCK PARTS

    $58.99
    BESTfit EZ Oil Drain Valve For Cummins & Paccar MX-13 Engines Through 2011Changing your oil is made easier with the EZ Oil Drain Valve. Unlike spring-assisted gate valves, EZ Oil's ball valve design...
    29-072002
    SKU:
    29-072002
    Truck Class:
    Heavy Duty
    Material Options:
    Steel
    Make:
    Universal Items
    Product Type:
    Engine Parts
    Style Options:
    Cummins
    Ready To Ship:
    Yes
    $58.99
    Qty in Cart: 0
    Price:
    $58.99
    Subtotal:
  • 36 Quart Steel Front Sump Engine Oil Pan Replaces 3046947 For Cummins

    36 Quart Steel Front Sump Engine Oil Pan Replaces 3046947 For Cummins

    AUTOMANN USA

    $392.99
    Front Sump Engine Oil Pan For Cummins- 36 QuartThis heavy-duty oil pan provides a precise fit and dependable performance for demanding use. Constructed for strength and durability, it features a deep...
    29-072000010
    SKU:
    29-072000010
    Truck Class:
    Heavy Duty
    Product Type:
    Engine Parts
    Style Options:
    Cummins
    Width Options:
    15 1/2 Inch
    Color:
    Black
    Length Options:
    47 Inch
    Make:
    Universal Items
    $392.99
    Qty in Cart: 0
    Price:
    $392.99
    Subtotal:
  • FREE SHIPPING
    22 Quart Baffled Engine Oil Pan - Replaces 175-3230

    22 Quart Baffled Engine Oil Pan - Replaces 175-3230

    DAYTON / DORMAN

    $666.99
    33.3 X 12.49 X 8.87 Inch 22 Quart Baffled Engine Oil PanThe 22 Quart Baffled Engine Oil Pan replaces engine oil pans with part number 175-3230. It features a baffled design that improves oil...
    29-072000009
    SKU:
    29-072000009
    Truck Class:
    Heavy Duty
    Make:
    Ford
    Make:
    Peterbilt
    Make:
    Chevrolet
    Make:
    Kenworth
    Make:
    Freightliner
    Make:
    Sterling
    Make:
    Bus
    Make:
    GMC
    Make:
    Western Star
    Product Type:
    Engine Parts
    $666.99
    Qty in Cart: 0
    Price:
    $666.99
    Subtotal:
  • 38 Quart Baffled Engine Oil Pan

    38 Quart Baffled Engine Oil Pan

    DAYTON / DORMAN

    $716.99
    Black 38 Quart Baffled Engine Oil Pan* High Quality Engine Oil Pan* Baffled: No* Bolt Hole Quantity: 32* Capacity: 38 Qt* Color/Finish: Black* Drain Plug Thread Size: 1X18* Length (In): 40.2 Inch*...
    29-072000007
    SKU:
    29-072000007
    Truck Class:
    Heavy Duty
    Make:
    Kenworth
    Make:
    Peterbilt
    Product Type:
    Engine Parts
    $716.99
    Qty in Cart: 0
    Price:
    $716.99
    Subtotal:
  • BESTfit Caterpillar C15 Flywheel Housing 1694153, 2234739, 3044156 For Kenworth & Peterbilt, CAT C15 1999-2010

    BESTfit Caterpillar C15 Flywheel Housing 1694153, 2234739, 3044156 For Kenworth & Peterbilt, CAT C15 1999-2010

    BESTFIT TRUCK PARTS

    $1,279.99
    BESTfit Flywheel Housing Fits CAT C15This BESTfit aluminum Flywheel Housing fits trucks with a CAT C15 engine. It features a driver-side starter location at the 9 o'clock position and is compatible...
    29-071694153
    SKU:
    29-071694153
    Truck Class:
    Heavy Duty
    Material Options:
    Aluminum
    Make:
    Peterbilt
    Make:
    Kenworth
    Product Type:
    Engine Parts
    Diameter Options:
    20 Inch
    Style Options:
    Angled
    Position:
    Driver Side
    Make:
    Universal Items
    Ready To Ship:
    Yes
    $1,279.99
    Qty in Cart: 0
    Price:
    $1,279.99
    Subtotal:
  • FREE SHIPPING
    Exhaust Manifold Kit - Replaces 150-1914 & 133-3359 For Caterpillar C15 Engine

    Exhaust Manifold Kit - Replaces 150-1914 & 133-3359 For Caterpillar C15 Engine

    AKMI

    $675.99
    Caterpillar C15 Exhaust Manifold KitRestore top-tier performance to your Caterpillar C15 with this expertly crafted Exhaust Manifold Kit. Featuring a cast-iron three-piece construction, this kit...
    29-071501914
    SKU:
    29-071501914
    Truck Class:
    Heavy Duty
    Make:
    Kenworth
    Make:
    Peterbilt
    Product Type:
    Engine Parts
    $675.99
    Qty in Cart: 0
    Price:
    $675.99
    Subtotal:
  • 3 Layer Replacement Air Filter Wrap For 29-071300042 High Performance Air Filter

    3 Layer Replacement Air Filter Wrap For 29-071300042 High Performance Air Filter

    FLEET FILTERS

    $112.99
    3 Layer Replacement Air Filter Wrap For High Performance Air Filter* High Quality Replacement Air Filter Wrap* For 29-071300042* 3 Layer Design* Does Not Come Pre-Oiled* Oil Is Required Before...
    29-071300043
    SKU:
    29-071300043
    Truck Class:
    Heavy Duty
    Make:
    Kenworth
    Make:
    Peterbilt
    Product Type:
    Engine Parts
    $112.99
    Qty in Cart: 0
    Price:
    $112.99
    Subtotal:
  • Gen III High Flow Performance Air Filter With Washable Element Media PACCAR T680, T880, 579

    Gen III High Flow Performance Air Filter With Washable Element Media PACCAR T680, T880, 579

    FLEET FILTERS

    $585.99
    Gen III High Performance Air Filter Media PACCAR T680, T880, 579You never need to waste money on paper filters again! 4 State Trucks proudly offers Fleet Air Filters, the only lifetime, washable,...
    29-071300042
    SKU:
    29-071300042
    Truck Class:
    Heavy Duty
    Make:
    Peterbilt
    Make:
    Kenworth
    Product Type:
    Engine Parts
    $585.99
    Qty in Cart: 0
    Price:
    $585.99
    Subtotal:
  • Gen III High Flow Performance Air Filter With Washable Element Media For Media Kenworth T660, T800, W900S

    Gen III High Flow Performance Air Filter With Washable Element Media For Media Kenworth T660, T800, W900S

    FLEET FILTERS

    $585.99
    Gen III High Performance Air Filter Media Kenworth T660, T800, W900SYou never need to waste money on paper filters again! 4 State Trucks proudly offers Fleet Air Filters, the only lifetime, washable,...
    29-071300041
    SKU:
    29-071300041
    Truck Class:
    Heavy Duty
    Make:
    Kenworth
    Product Type:
    Engine Parts
    $585.99
    Qty in Cart: 0
    Price:
    $585.99
    Subtotal:
  • 3 Layer Replacement Air Filter Wrap For 29-071300024 High Performance Air Filter For Kenworth & Peterbilt

    3 Layer Replacement Air Filter Wrap For 29-071300024 High Performance Air Filter For Kenworth & Peterbilt

    FLEET FILTERS

    $195.99
    3 Layer Replacement Air Filter Wrap For High Performance Air Filter* High Quality Replacement Air Filter Wrap* For 29-071300024* 3 Layer Design* Does Not Come Pre-Oiled* Oil Is Required Before...
    29-071300026
    SKU:
    29-071300026
    Truck Class:
    Heavy Duty
    Make:
    Kenworth
    Make:
    Peterbilt
    Product Type:
    Engine Parts
    $195.99
    Qty in Cart: 0
    Price:
    $195.99
    Subtotal:
  • High Flow Performance Air Filter With Washable Element Media For Peterbilt & Kenworth

    High Flow Performance Air Filter With Washable Element Media For Peterbilt & Kenworth

    FLEET FILTERS

    $444.99
    High Performance Air Filter Media Fits Peterbilt, KenworthYou never need to waste money on paper filters again! 4 State Trucks proudly offers Fleet Air Filters, the only lifetime, washable, high...
    29-071300024
    SKU:
    29-071300024
    Truck Class:
    Heavy Duty
    Make:
    Kenworth
    Make:
    Peterbilt
    Product Type:
    Engine Parts
    $444.99
    Qty in Cart: 0
    Price:
    $444.99
    Subtotal:
  • 3 Layer Replacement Air Filter Wrap For 29-071300004 High Performance Air Filter

    3 Layer Replacement Air Filter Wrap For 29-071300004 High Performance Air Filter

    FLEET FILTERS

    $195.99
    3 Layer Replacement Air Filter Wrap For High Performance Air FilterThe replacement air filter wrap for the 29-071300004 model features a 3-layer design that services one filter. The new wraps do not...
    29-071300006
    SKU:
    29-071300006
    Truck Class:
    Heavy Duty
    Make:
    Kenworth
    Make:
    Peterbilt
    Product Type:
    Engine Parts
    $195.99
    Qty in Cart: 0
    Price:
    $195.99
    Subtotal:
  • High Flow Performance Air Filter W/ Washable Element For Freightliner, Kenworth, Peterbilt & Western Star

    High Flow Performance Air Filter W/ Washable Element For Freightliner, Kenworth, Peterbilt & Western Star

    FLEET FILTERS

    $444.99
    High Performance Air Filter Fits Freightliner, Mack, Kenworth, Peterbilt, Western StarFleet Air Filters are durable, washable, and high-flow air filters that offer long-lasting performance. These...
    29-071300004
    SKU:
    29-071300004
    Truck Class:
    Heavy Duty
    Make:
    Kenworth
    Make:
    Peterbilt
    Product Type:
    Engine Parts
    $444.99
    Qty in Cart: 0
    Price:
    $444.99
    Subtotal:
  • BESTfit Water Pump Replaces 1859821, 1828162 For Paccar MX13 Diesel Engine Trucks

    BESTfit Water Pump Replaces 1859821, 1828162 For Paccar MX13 Diesel Engine Trucks

    BESTFIT TRUCK PARTS

    $329.99
    BESTfit Paccar MX13 Water Pump* High Quality Water Pump* Sold Individually* Warranty On Water Pumps Against Defects In Workmanship & Material From Date Of Purchase*** High Quality Aftermarket...
    29-071200029
    SKU:
    29-071200029
    Truck Class:
    Heavy Duty
    Make:
    Kenworth
    Make:
    Peterbilt
    Product Type:
    Engine Parts
    Ready To Ship:
    Yes
    $329.99
    Qty in Cart: 0
    Price:
    $329.99
    Subtotal:
  • BESTfit Exhaust Manifold Kit, End Section For Paccar MX13 Diesel Engine Trucks

    BESTfit Exhaust Manifold Kit, End Section For Paccar MX13 Diesel Engine Trucks

    BESTFIT TRUCK PARTS

    $417.99
    BESTfit Exhaust Manifold Kit To Replace End SectionIntroducing BESTfit CHROME EXHAUST KITS! These Kits Are Installer-Friendly, Produced With All High Quality Components, Offer The Best Tee Pipe...
    29-071200028
    SKU:
    29-071200028
    Truck Class:
    Heavy Duty
    Make:
    Peterbilt
    Make:
    Kenworth
    Product Type:
    Engine Parts
    $417.99
    Qty in Cart: 0
    Price:
    $417.99
    Subtotal:
  • FREE SHIPPING OVER $249
    Crank Position Sensor Connector/Terminal - Replaces 8929387

    Crank Position Sensor Connector/Terminal - Replaces 8929387

    DAYTON / DORMAN

    $86.99
    Crank Position Sensor Connector/Terminal* High Quality Crank Position Sensor* Connector/Terminal Configuration: 2 Cavity Male* Material: Metal: Plastic* Package Contents: 1 Crankshaft Position...
    29-071200026
    SKU:
    29-071200026
    Truck Class:
    Heavy Duty
    Make:
    Kenworth
    Make:
    Peterbilt
    Product Type:
    Engine Parts
    $86.99
    Qty in Cart: 0
    Price:
    $86.99
    Subtotal:
  • EGR Valve Replaces 4955421 For Cummins ISM 10.8L

    EGR Valve Replaces 4955421 For Cummins ISM 10.8L

    BESTFIT TRUCK PARTS

    $976.99
    EGR Valve Fits Cummins ISM 10.8 Liter 2003-2007The EGR valve is a direct replacement for part number 4955421, designed for the Cummins ISM 10.8L engine. It effectively re-circulates exhaust gas for...
    29-0711011
    SKU:
    29-0711011
    Truck Class:
    Heavy Duty
    Make:
    Kenworth
    Make:
    Peterbilt
    Product Type:
    Engine Parts
    $976.99
    Qty in Cart: 0
    Price:
    $976.99
    Subtotal:
  • Total: items /

Adding your products to cart

When you're running a Kenworth, engine performance and cooling reliability are everything. That’s why our aftermarket Kenworth engine parts and cooling components are built for the long haul. Whether you're driving a W900, T680, or T800, this product lineup is designed to keep your engine temps in check and your rig on the road.

Upgrade Performance with Engine Cooling Components

From steep grades to long idle times, your Kenworth engine works hard—and heat builds fast. Our heavy-duty parts help you control that heat, extend yourKenworth engine lifecycle, and avoid costly downtime. If you’re upgrading, you can also ensure that your Kenworth exhaust flow is stronger and more stable.

Find Replacement Engine Parts

- Radiators & Condensers: High-efficiency designs that boost cooling and resist clogging. - Charge Air Coolers: Improve air density for better combustion and fuel economy. - Coolant Tubes & Reservoirs: Direct-fit, corrosion-resistant designs for leak-free performance. - Heater Cores & Blower Motors: Keep your cab warm and defrost working in the winter. - A/C Compressors & Expansion Valves: Restore your climate control and beat the summer heat.

Why Buy Aftermarket?

- Tough Materials: Many parts built from stainless steel, copper, or aluminum for long-lasting durability. - Direct Fit for Kenworth Models: Save time on installation with components made to match OEM specs. - Lower Cost, Same (or Better) Performance: Get more value without sacrificing reliability.
Whether you're chasing down a coolant leak, upgrading your CAC, or just trying to stay comfortable in the cab, we’ve got the Kenworth engine and cooling parts to get the job done right.

Frequently Asked Questions About Kenworth Engine Parts & Cooling

What coolant type should I use for my Kenworth engine, and how often should I change it?

Most modern Kenworth engines require extended life coolant (ELC) that meets OEM specifications, typically a nitrite-free, ethylene glycol-based formula. For Paccar MX engines (2011 and newer), use Paccar Premium coolant or equivalent meeting ES Compleat OAT specifications. For Cummins ISX engines, use Fleetguard ES Compleat or equivalent. Change intervals vary: ELC coolants typically last 600,000 miles or 6 years with proper maintenance and additive testing at 300,000 miles. Always verify your specific engine requirements in your owner's manual, as using incorrect coolant can cause severe engine damage.

How do I know if my radiator fits my specific Kenworth model and engine configuration?

Radiator compatibility depends on three key factors: your truck model (T680, T880, W900, etc.), engine type (Paccar MX-13, Cummins ISX15, Cat C15), and model year. Critical measurements include core size (typically ranging from 42" to 48" wide), inlet/outlet locations, and mounting bracket positions. Check your OEM-specific build sheet or the radiator part number tag (usually located on the top tank) to ensure exact fitment. Common mismatches occur with pre-2008 versus post-2008 models due to emissions equipment changes that altered cooling requirements.

What are the warning signs that my water pump needs replacement?

Key indicators include coolant leaks from the weep hole (small hole at bottom of pump), excessive play in the pump shaft when wiggled by hand, grinding or growling noises from the pump area, engine overheating despite proper coolant levels, and coolant in the oil (indicating seal failure). Most Kenworth water pumps last 400,000-500,000 miles under normal conditions. Early failure often results from contaminated coolant, improper belt tension, or running the engine hot. Replace the thermostat and flush the cooling system when installing a new pump to prevent premature failure.

Can I upgrade my stock cooling system for heavy-haul or high-temperature operations?

Yes, several upgrades can improve cooling capacity for demanding applications. Consider installing a heavy-duty aluminum radiator with increased core thickness (upgrading from 2-row to 4-row), adding an auxiliary transmission cooler, upgrading to a high-flow water pump, or installing a fan clutch with higher engagement temperature settings. For extreme conditions, charge air cooler upgrades and larger capacity surge tanks also help. Ensure any upgrades match your engine's flow requirements - excessive cooling capacity can cause incomplete combustion and increased emissions in modern engines.

Why do thermostats fail frequently, and which temperature rating should I use?

Thermostat failure typically results from coolant contamination, scale buildup, or using incorrect coolant mixtures that corrode the thermostat spring and seal. Standard temperature ratings are 180?F for older mechanical engines and 185-190?F for modern emissions-compliant engines. Never run without a thermostat as this prevents proper engine warm-up, reduces fuel efficiency, and can trigger fault codes. High-quality thermostats include jiggle pins for air bleeding and stainless steel construction for longevity. Replace every 200,000-300,000 miles as preventive maintenance, or whenever cooling system major service is performed.


ORDERING

COMPANY INFO

GENERAL INFO

CONTACT

Call Us: 888-875-7787

Text Us: 888-875-7787
Wholesale: 855-220-8608

Fax: 417-624-2489

HOURS

8 AM - 5 PM (Mon - Fri)

9 AM - 3 PM (Sat)

Closed (Sun)

Holiday Hours Vary, Please Call Ahead

4 STATE TRUCKS

4579 Highway 43

Joplin, MO 64804

Introducing the Official 4 State Trucks Mobile App – Gear Up On the Go!