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Mack RD Truck Engine Parts & Cooling

Check out our top-notch Mack RD Truck engine parts and cooling system components. From reliable radiators to efficient charge coolers, we've got you covered. Find the perfect solutions to elevate your ride at 4 State Trucks!
  • Product
  • Qty in Cart
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  • Price
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  • Isspro Electric Oil Pressure Sensor - PD Style For 0-150 PSI/0-10 Bar

    Isspro Electric Oil Pressure Sensor - PD Style For 0-150 PSI/0-10 Bar

    ISSPRO

    $67.99
    PD Style Oil Pressure Sensor* High Quality Oil Pressure Sensor* Electric* 0-150 PSI * 1 Stud Terminal * Pd Style* Made In USA* Sold Individually* Warranty On Oil Pressure Sensors Against Defects In...
    09-07100002
    SKU:
    09-07100002
    Material Options:
    Brass
    Truck Class:
    Universal
    Make:
    Universal Items
    Product Type:
    Engine Parts
    $67.99
    Qty in Cart: 0
    Price:
    $67.99
    Subtotal:
  • Cogged V - Serpentine Belt 30 Inch

    Cogged V - Serpentine Belt 30 Inch

    AFTERMARKET

    $8.73
    30 Inch Cogged V - Serpentine Belt* High Quality V Serpentine Belt* Effective Length- 30.00 Inch* No Ribs* Sold Individually* Warranty On V Serpentine Belts Against Defects In Workmanship & Material...
    29-07060102
    SKU:
    29-07060102
    Material Options:
    Plastic/Poly
    Truck Class:
    Heavy Duty
    Make:
    Universal Items
    Product Type:
    Engine Parts
    $8.73
    Qty in Cart: 0
    Price:
    $8.73
    Subtotal:
  • Fleetguard WF2127 Spin On Water Filter For Cummins ISX QSX Models

    Fleetguard WF2127 Spin On Water Filter For Cummins ISX QSX Models

    OPP - ORIGINAL PARTS PROGRAM

    $55.99
    Coolant Filter For Cummins ISX Engines* High Quality Water Filter* Spin On* Sold Individually* Warranty On Water Filters Against Defects In Workmanship & Material From Date Of Purchase*** This Is An...
    WF2127FLG
    SKU:
    WF2127FLG
    Truck Class:
    Universal
    Make:
    Universal Items
    Product Type:
    Engine Parts
    $55.99
    Qty in Cart: 0
    Price:
    $55.99
    Subtotal:
  • On Sale
    Limited Quantity Available
    RigMaster APU Radiator Cap 13 PSI

    RigMaster APU Radiator Cap 13 PSI

    RIGMASTER

    Now: $8.16
    Was: $22.43
    13 PSI APU Radiator Cap* High Quality Radiator Cap* 13 PSI* Sold Individually* Warranty On Radiator Caps Against Defects In Workmanship & Material From Date Of Purchase*** High Quality Aftermarket...
    RP5029
    SKU:
    RP5029
    Location:
    Made In USA
    Truck Class:
    Heavy Duty
    Make:
    Universal Items
    Product Type:
    Engine Parts
    Ready To Ship:
    Yes
    Now: $8.16
    Was: $22.43
    Qty in Cart: 0
    Price:
    Now: $8.16
    Was: $22.43
    Subtotal:
  • RigMaster Linz Generator Conversion Kit For Caterpillar, Perkins Engine

    RigMaster Linz Generator Conversion Kit For Caterpillar, Perkins Engine

    RIGMASTER

    $1,373.99
    Linz Generator Conversion Kit* High Quality Linz Generator Conversion Kit* Kit Includes:  - Linz Generator Kit   - Rear Engine Bracket   - Generator Pulley Bushing   - Serpentine Belt   - Mounting...
    RP7029KU
    SKU:
    RP7029KU
    Material Options:
    Steel
    Truck Class:
    Heavy Duty
    Make:
    Universal Items
    Product Type:
    Engine Parts
    $1,373.99
    Qty in Cart: 0
    Price:
    $1,373.99
    Subtotal:
  • RigMaster APU 170 AMP Alternator With Serpentine Pulley For Kohler LG200 Moto

    RigMaster APU 170 AMP Alternator With Serpentine Pulley For Kohler LG200 Moto

    RIGMASTER

    $469.99
    RigMaster 170 AMP Alternator With Serpentine Pulley* High Quality Smart Alternator* 170 Amp* With Serpentine Belt Pulley* Sold Individually* Warranty On Smart Alternators Against Defects In...
    LG7004
    SKU:
    LG7004
    Location:
    Made In USA
    Material Options:
    Steel
    Truck Class:
    Heavy Duty
    Make:
    Universal Items
    Product Type:
    Engine Parts
    $469.99
    Qty in Cart: 0
    Price:
    $469.99
    Subtotal:
  • RigMaster APU Linz Generator Replacement Kit For Apus With Kohler Engine

    RigMaster APU Linz Generator Replacement Kit For Apus With Kohler Engine

    RIGMASTER

    $1,426.99
    Linz Generator Replacement Kit For Apus Kohler Engine* High Quality Linz Generator Kit* Sold Individually* Warranty On Generator Conversion Kits Against Defects In Workmanship & Material From Date Of...
    KT7029KU
    SKU:
    KT7029KU
    Material Options:
    Steel
    Truck Class:
    Heavy Duty
    Location:
    Made In USA
    Make:
    Universal Items
    Product Type:
    Engine Parts
    $1,426.99
    Qty in Cart: 0
    Price:
    $1,426.99
    Subtotal:
  • RigMaster APU Fuel Lift / Feeding Pump For Kohler Engine

    RigMaster APU Fuel Lift / Feeding Pump For Kohler Engine

    RIGMASTER

    $192.99
    Kohler Diesel OEM Part ED0065851510-S Fuel Feeding Pump* High Quality Lift Pump* Sold Individually* Warranty On Lift Pumps Against Defects In Workmanship & Material From Date Of Purchase*** High...
    ED0065851510S
    SKU:
    ED0065851510S
    Truck Class:
    Heavy Duty
    Location:
    Made In USA
    Material Options:
    Steel
    Make:
    Universal Items
    Product Type:
    Engine Parts
    Ready To Ship:
    Yes
    $192.99
    Qty in Cart: 0
    Price:
    $192.99
    Subtotal:
  • RigMaster APU Sub-Frame Kit For Caterpillar, Perkins LG200 Motor

    RigMaster APU Sub-Frame Kit For Caterpillar, Perkins LG200 Motor

    RIGMASTER

    $532.99
    RigMaster Sub-Frame Kit For T46 & LG200 Models For Mounting On The Catwalk* High Quality Sub-Frame Kit* Sold Individually* Warranty On Sub-Frame Kits Against Defects In Workmanship & Material From...
    LG10050K
    SKU:
    LG10050K
    Truck Class:
    Heavy Duty
    Make:
    Universal Items
    Product Type:
    Engine Parts
    $532.99
    Qty in Cart: 0
    Price:
    $532.99
    Subtotal:
  • RigMaster APU Alternator / Fan V-Belt For Caterpillar, Perkins LG200

    RigMaster APU Alternator / Fan V-Belt For Caterpillar, Perkins LG200

    RIGMASTER

    $9.35
    RigMaster Alternator / Fan V-Belt For Caterpillar And Perkins Engine LG200* High Quality Alternator/ Fan Belt* Sold Individually* Warranty On Alternator/ Fan Belts Against Defects In Workmanship &...
    LG8005
    SKU:
    LG8005
    Truck Class:
    Heavy Duty
    Material Options:
    Rubber
    Location:
    Made In USA
    Make:
    Universal Items
    Product Type:
    Engine Parts
    $9.35
    Qty in Cart: 0
    Price:
    $9.35
    Subtotal:
  • RigMaster APU Fuel Injector Pump Kit For Kohler Engine

    RigMaster APU Fuel Injector Pump Kit For Kohler Engine

    RIGMASTER

    $954.99
    Kohler Diesel OEM Part ED0065851510-S Fuel Feeding Pump* High Quality Injection Pump Kit* Includes   - Fuel Injector Pump  - Fuel Injector Spark Arrestor  - Copper Washer* Sold Individually* Warranty...
    ED0065902900SK
    SKU:
    ED0065902900SK
    Truck Class:
    Heavy Duty
    Material Options:
    Plastic/Poly
    Location:
    Made In USA
    Make:
    Universal Items
    Product Type:
    Engine Parts
    $954.99
    Qty in Cart: 0
    Price:
    $954.99
    Subtotal:
  • RigMaster APU Sub-Frame Kit For T46K Units

    RigMaster APU Sub-Frame Kit For T46K Units

    RIGMASTER

    $533.99
    RigMaster Sub-Frame Kit For T46K Units With Or Without Heat* High Quality Sub Frame Kit* For T46K Units With Or Without Heat* Sold Individually* Warranty On Sub Frame Kits Against Defects In...
    KT10050K
    SKU:
    KT10050K
    Location:
    Made In USA
    Truck Class:
    Universal
    Material Options:
    Steel
    Make:
    Universal Items
    Product Type:
    Engine Parts
    $533.99
    Qty in Cart: 0
    Price:
    $533.99
    Subtotal:
  • RigMaster APU Linz To Linz Generator Replacement Kit For Kohler Engine

    RigMaster APU Linz To Linz Generator Replacement Kit For Kohler Engine

    RIGMASTER

    $1,296.99
    Generator Replacement Kit For Kohler Engine* High Quality Generator Replacement Kit* Linz To Linz * Sold Individually* Warranty On Generator Replacement Kits Against Defects In Workmanship & Material...
    KT7029K
    SKU:
    KT7029K
    Truck Class:
    Heavy Duty
    Make:
    Universal Items
    Product Type:
    Engine Parts
    $1,296.99
    Qty in Cart: 0
    Price:
    $1,296.99
    Subtotal:
  • RigMaster APU Starter For Kohler Engine

    RigMaster APU Starter For Kohler Engine

    RIGMASTER

    $781.99
    RigMaster Starter For Kohler Engine OEM Part* High Quality Starter* 12 Volt* Sold Individually* Warranty On Starters Against Defects In Workmanship & Material From Date Of Purchase*** High Quality...
    ED0058402240S
    SKU:
    ED0058402240S
    Location:
    Made In USA
    Truck Class:
    Heavy Duty
    Make:
    Universal Items
    Product Type:
    Engine Parts
    $781.99
    Qty in Cart: 0
    Price:
    $781.99
    Subtotal:
  • RigMaster APU Fuel Filter For Caterpillar, Perkins

    RigMaster APU Fuel Filter For Caterpillar, Perkins

    RIGMASTER

    $28.08
    RigMaster Fuel Filter For Caterpillar & Perkins Engines* High Quality Fuel Filter* Sold Individually* Warranty On Fuel Filters Against Defects In Workmanship & Material From Date Of Purchase*** High...
    33262
    SKU:
    33262
    Location:
    Made In USA
    Truck Class:
    Heavy Duty
    Make:
    Universal Items
    Product Type:
    Engine Parts
    $28.08
    Qty in Cart: 0
    Price:
    $28.08
    Subtotal:
  • RigMaster APU Water Pump For Caterpillar, Perkins

    RigMaster APU Water Pump For Caterpillar, Perkins

    RIGMASTER

    $485.99
    OEM RigMaster Water Pump For Caterpillar & Perkins Engines* High Quality Water Pump* Sold Individually* Warranty On Water Pumps Against Defects In Workmanship & Material From Date Of Purchase*** High...
    145017380
    SKU:
    145017380
    Truck Class:
    Heavy Duty
    Material Options:
    Steel
    Make:
    Universal Items
    Product Type:
    Engine Parts
    $485.99
    Qty in Cart: 0
    Price:
    $485.99
    Subtotal:
  • On Sale
    Limited Quantity Available
    RigMaster Serpentine Drive Belt - RM-RP8-108 For Caterpillar, Perkins Engines

    RigMaster Serpentine Drive Belt - RM-RP8-108 For Caterpillar, Perkins Engines

    RIGMASTER

    Now: $11.45
    Was: $37.36
    Serpentine Drive Belt - RP8-108* High Quality Serpentine Drive Belt* Sold Individually * Warranty On Serpentine Drive Belts Against Defects In Workmanship & Material From Date Of Purchase*** High...
    RP8108
    SKU:
    RP8108
    Truck Class:
    Universal
    Material Options:
    Rubber
    Make:
    Universal Items
    Product Type:
    Engine Parts
    Ready To Ship:
    Yes
    Now: $11.45
    Was: $37.36
    Qty in Cart: 0
    Price:
    Now: $11.45
    Was: $37.36
    Subtotal:
  • RigMaster Analog Speed Sensor Upgrade Kit For Caterpillar, Perkins Engines

    RigMaster Analog Speed Sensor Upgrade Kit For Caterpillar, Perkins Engines

    RIGMASTER

    $128.99
    Analog Speed Sensor Upgrade Kit - RP7-106KThe Analog Kit includes a Mechanical/Analog Speed Sensor, an Analog Speed Sensor Connector with Pigtail, a Speed Sensor Bracket, two Yellow Zinc Cap Screws,...
    RP7106K
    SKU:
    RP7106K
    Truck Class:
    Heavy Duty
    Make:
    Universal Items
    Product Type:
    Engine Parts
    Ready To Ship:
    Yes
    $128.99
    Qty in Cart: 0
    Price:
    $128.99
    Subtotal:
  • RigMaster 20A Power Module, LED Display, 10-Pin Output, 8-Pin Input

    RigMaster 20A Power Module, LED Display, 10-Pin Output, 8-Pin Input

    RIGMASTER

    $463.99
    High-Capacity 20 Amp Power Module W/ LED Display - 10 Pin Output, 8 pin Input - RP50-2505* High Quality Power Module * 20 Amps * LED Display  - Green= OK  - Red= Problem * 10 Pin Output * 8 Pin...
    RP502505
    SKU:
    RP502505
    Truck Class:
    Heavy Duty
    Make:
    Universal Items
    Product Type:
    Engine Parts
    $463.99
    Qty in Cart: 0
    Price:
    $463.99
    Subtotal:
  • RigMaster Auxiliary Power Unit For Kohler Engine

    RigMaster Auxiliary Power Unit For Kohler Engine

    RIGMASTER

    $10,401.99
    Kohler Auxiliary Power Unit - LG200-K* High Quality Auxiliary Power Unit* Dimensions:   - 25 Inch Depth  - 21 Inch Width  - 28 Inch Height * 170 Amps For Battery Charging * 600 Airflow CFM* 24,000...
    LG200K
    SKU:
    LG200K
    Truck Class:
    Heavy Duty
    Material Options:
    Aluminum
    Make:
    Universal Items
    Product Type:
    Engine Parts
    $10,401.99
    Qty in Cart: 0
    Price:
    $10,401.99
    Subtotal:
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Frequently Asked Questions About Mack RD Truck Engine Parts & Cooling

What types of components are included in this category?

This category covers engine and cooling system parts for Mack RD model trucks, including items such as radiators, radiator hoses, water pumps, fan clutches, cooling fans, thermostats, oil coolers, and related gaskets and mounting hardware. These parts work together to keep the engine running at a safe operating temperature and support proper engine function.

How do I know a part will fit my specific Mack RD truck?

Mack RD trucks were built over several years with different engine configurations, so fitment can vary by model year and engine type. Before ordering, check your truck's VIN and engine model against the part's listed specifications, or reach out to our parts team with your truck's details so we can confirm compatibility before you buy.

What are common signs that a cooling system part needs to be replaced?

Watch for symptoms like the engine running hotter than normal, coolant leaks under the truck, a fan clutch that stays engaged or never engages, low coolant levels without an obvious leak, or visible corrosion and cracking on hoses and radiator seams. Catching these issues early can help prevent more serious engine damage.

Should I choose OEM or aftermarket parts for my Mack RD engine?

Both OEM and quality aftermarket cooling and engine parts can be reliable choices, and the right option often depends on your budget, availability, and how the truck is used. We carry a mix of OEM and aftermarket options so you can compare fit, materials, and price to find the part that best suits your needs.

Do I need professional installation for engine and cooling parts?

Some parts, like hoses, thermostats, or belts, are straightforward enough for an experienced DIY mechanic with the right tools. Others, such as water pumps, fan clutches, or radiators, may involve draining coolant, disconnecting engine components, or working near pressurized systems, so many owners choose to have these installed by a qualified diesel technician to ensure proper sealing and function.


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