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Mack R Truck Engine Parts & Cooling

Looking to keep your rig running smoothly? Check out 4 State Trucks for top-notch Mack R Truck engine parts and cooling components. Our selection has everything you need for a strong performance.
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  • BESTfit Steel Front Sump Oil Pan For Cummins X15 Engines - Replaces 5647538

    BESTfit Steel Front Sump Oil Pan For Cummins X15 Engines - Replaces 5647538

    BESTFIT TRUCK PARTS

    $644.99
    BESTfit Oil Pan W/ Front Sump - Replaces 4386821* High Quality Steel Oil Pan* Front Sump* Fits Cummins X15 2016-Current* Sold Individually* Warranty On Oil Pans Against Defects In Workmanship &...
    29-07200020
    SKU:
    29-07200020
    Make:
    Universal Items
    Truck Class:
    Heavy Duty
    Material Options:
    Steel
    Product Type:
    Engine Parts
    Style Options:
    Cummins
    $644.99
    Qty in Cart: 0
    Price:
    $644.99
    Subtotal:
  • BESTfit Damper Replaces 8929294, 8929502 For 11.1L, 12.7L, 14.0L Detroit Diesel Series 60 Engines

    BESTfit Damper Replaces 8929294, 8929502 For 11.1L, 12.7L, 14.0L Detroit Diesel Series 60 Engines

    BESTFIT TRUCK PARTS

    $610.99
    BESTfit Damper* High Quality Damper* Sold Individually* Warranty On Dampers Against Defects In Workmanship & Material From Date Of Purchase*** High Quality Aftermarket Replacement Part (Not OEM)****...
    29-07040027
    SKU:
    29-07040027
    Make:
    Universal Items
    Truck Class:
    Heavy Duty
    Material Options:
    Steel
    Product Type:
    Engine Parts
    $610.99
    Qty in Cart: 0
    Price:
    $610.99
    Subtotal:
  • BESTfit Cummins ISC, ISL Flywheel 3909908

    BESTfit Cummins ISC, ISL Flywheel 3909908

    BESTFIT TRUCK PARTS

    $520.99
    BESTfit Flywheel* High Quality Flywheel* 158 Teeth Count * Uses Ring Gear* Sold Individually* Warranty On Flywheels Against Defects In Workmanship & Material From Date Of Purchase*** High Quality...
    29-07040029
    SKU:
    29-07040029
    Make:
    Universal Items
    Truck Class:
    Heavy Duty
    Material Options:
    Aluminum
    Product Type:
    Engine Parts
    $520.99
    Qty in Cart: 0
    Price:
    $520.99
    Subtotal:
  • BESTfit Damper Replaces 3073587 For Cummins ISM, M1 Engines

    BESTfit Damper Replaces 3073587 For Cummins ISM, M1 Engines

    BESTFIT TRUCK PARTS

    $488.99
    BESTfit Damper* High Quality Damper* Sold Individually* Warranty On Dampers Against Defects In Workmanship & Material From Date Of Purchase*** High Quality Aftermarket Replacement Part (Not OEM)****...
    29-07040028
    SKU:
    29-07040028
    Truck Class:
    Universal
    Material Options:
    Steel
    Make:
    Universal Items
    Product Type:
    Engine Parts
    $488.99
    Qty in Cart: 0
    Price:
    $488.99
    Subtotal:
  • BESTfit Exhaust Manifold Replaces 3931440 For Cummins C Series Engines

    BESTfit Exhaust Manifold Replaces 3931440 For Cummins C Series Engines

    BESTFIT TRUCK PARTS

    $245.99
    BESTfit Exhaust Manifold* High Quality Exhaust Manifold* Turbo Exhaust Position LMFO* Made Of Iron* Sold Individually* Warranty On Exhaust Manifolds Against Defects In Workmanship & Material From...
    29-07120050
    SKU:
    29-07120050
    Make:
    Universal Items
    Truck Class:
    Heavy Duty
    Material Options:
    Steel
    Product Type:
    Engine Parts
    $245.99
    Qty in Cart: 0
    Price:
    $245.99
    Subtotal:
  • BESTfit Cummins ISC, ISL Flywheel Replaces 3282171

    BESTfit Cummins ISC, ISL Flywheel Replaces 3282171

    BESTFIT TRUCK PARTS

    $798.99
    BESTfit Flywheel* High Quality Flywheel* 138 Teeth Count* Uses A Ring Gear* Sold Individually* Warranty On Flywheels Against Defects In Workmanship & Material From Date Of Purchase*** High Quality...
    29-07040023
    SKU:
    29-07040023
    Make:
    Universal Items
    Truck Class:
    Heavy Duty
    Material Options:
    Billet Aluminum
    Product Type:
    Engine Parts
    $798.99
    Qty in Cart: 0
    Price:
    $798.99
    Subtotal:
  • BESTfit Cummins ISX12 Flywheel

    BESTfit Cummins ISX12 Flywheel

    BESTFIT TRUCK PARTS

    $537.99
    BESTfit SAE No 1 Flywheel W/ Ring Gear* High Quality Flywheel* Size SAE No.1* 15.5 Inch Clutch* Ring Gear (Included)* Sold Individually* Warranty On Flywheels Against Defects In Workmanship &...
    29-07040024
    SKU:
    29-07040024
    Make:
    Universal Items
    Truck Class:
    Heavy Duty
    Material Options:
    Billet Aluminum
    Product Type:
    Engine Parts
    Style Options:
    Cummins
    $537.99
    Qty in Cart: 0
    Price:
    $537.99
    Subtotal:
  • BESTfit Detroit Diesel DD15 Flywheel, 160 Tooth Count

    BESTfit Detroit Diesel DD15 Flywheel, 160 Tooth Count

    BESTFIT TRUCK PARTS

    $524.99
    BESTfit Flywheel W/ 12 Mounting Holes, 1 Dowel Pin Hole & 15 Inch Clutch Size* High Quality Flywheel* 12 Mounting Holes* 1 Dowel Pin Hole* 10 Inch Bore Opening* Ring Gear (Included)* 160 Teeth Count*...
    29-07040021
    SKU:
    29-07040021
    Make:
    Universal Items
    Truck Class:
    Heavy Duty
    Product Type:
    Engine Parts
    $524.99
    Qty in Cart: 0
    Price:
    $524.99
    Subtotal:
  • BESTfit Cummins 8.3L ISC-ISL Iron Flywheel Housing

    BESTfit Cummins 8.3L ISC-ISL Iron Flywheel Housing

    BESTFIT TRUCK PARTS

    $876.99
    BESTfit Cast Iron Flywheel Housing* High Quality Flywheel Housing* Cast Iron* Sold Individually* Warranty On Flywheel Housings Against Defects In Workmanship & Material From Date Of Purchase*** High...
    29-07040026
    SKU:
    29-07040026
    Make:
    Universal Items
    Truck Class:
    Heavy Duty
    Product Type:
    Engine Parts
    $876.99
    Qty in Cart: 0
    Price:
    $876.99
    Subtotal:
  • BESTfit Camshaft 691921 For Detroit Diesel Series 60 11.1L Engines

    BESTfit Camshaft 691921 For Detroit Diesel Series 60 11.1L Engines

    BESTFIT TRUCK PARTS

    $865.99
    BESTfit New Aftermarket Detroit CamshaftThis Camshaft fits in your Aftermarket Detroit Diesel Series 60 Heavy Duty Trucks.* High Quality Camshaft* Sold Individually* Warranty On Camshafts Against...
    29-07040009
    SKU:
    29-07040009
    Make:
    Universal Items
    Truck Class:
    Heavy Duty
    Material Options:
    Steel
    Product Type:
    Engine Parts
    $865.99
    Qty in Cart: 0
    Price:
    $865.99
    Subtotal:
  • BESTfit D11 Flywheel, 153 Tooth Count For Mack MP7, Volvo

    BESTfit D11 Flywheel, 153 Tooth Count For Mack MP7, Volvo

    BESTFIT TRUCK PARTS

    $720.99
    BESTfit Flywheel W/ 12 Mounting Holes, 10 Inch Bore Opening & 15 Inch Clutch Size* High Quality Flywheel* 12 Mounting Holes* 1 Dowel Pin Hole* 10 Inch Bore Opening* Ring Gear (Included)* 153 Teeth...
    29-07040022
    SKU:
    29-07040022
    Make:
    Universal Items
    Truck Class:
    Heavy Duty
    Material Options:
    Steel
    Product Type:
    Engine Parts
    $720.99
    Qty in Cart: 0
    Price:
    $720.99
    Subtotal:
  • BESTfit Cam Shaft Replaces 4025134 For Cummins ISB Engines

    BESTfit Cam Shaft Replaces 4025134 For Cummins ISB Engines

    BESTFIT TRUCK PARTS

    $198.99
    BESTfit Cam Shaft* High Quality Camshaft* Sold Individually* Warranty On Camshafts Against Defects In Workmanship & Material From Date Of Purchase*** High Quality Aftermarket Replacement Part (Not...
    29-07040007
    SKU:
    29-07040007
    Make:
    Universal Items
    Truck Class:
    Heavy Duty
    Material Options:
    Steel
    Product Type:
    Engine Parts
    $198.99
    Qty in Cart: 0
    Price:
    $198.99
    Subtotal:
  • BESTfit Cummins C Series Cast Iron Flywheel Housing, SAE No 1 Size

    BESTfit Cummins C Series Cast Iron Flywheel Housing, SAE No 1 Size

    BESTFIT TRUCK PARTS

    $1,035.99
    BESTfit Cast Iron Flywheel Housing* High Quality Flywheel Housing* Cast Iron* Size: SAE No. 1* Starter  - 1 O Clock Position * Sold Individually* Warranty On Flywheel Housings Against Defects In...
    29-07040005
    SKU:
    29-07040005
    Make:
    Universal Items
    Truck Class:
    Heavy Duty
    Material Options:
    Steel
    Product Type:
    Engine Parts
    $1,035.99
    Qty in Cart: 0
    Price:
    $1,035.99
    Subtotal:
  • BESTfit Camshaft 691920 For Detroit Diesel Series 60 12.7L & 14.0L Engines

    BESTfit Camshaft 691920 For Detroit Diesel Series 60 12.7L & 14.0L Engines

    BESTFIT TRUCK PARTS

    $865.99
    BESTfit Detroit Diesel 60 Series 12.7 Engine CamshaftThis Camshaft fits in your Aftermarket Detroit Diesel Series 60 12.7L/14.0L Heavy Duty Trucks.* High Quality Camshaft* Sold Individually* Warranty...
    29-07040008
    SKU:
    29-07040008
    Make:
    Universal Items
    Truck Class:
    Heavy Duty
    Material Options:
    Steel
    Product Type:
    Engine Parts
    $865.99
    Qty in Cart: 0
    Price:
    $865.99
    Subtotal:
  • BESTfit Cam Shaft Replaces 3930378 For Cummins B Series Engines

    BESTfit Cam Shaft Replaces 3930378 For Cummins B Series Engines

    BESTFIT TRUCK PARTS

    $134.99
    BESTfit Cam Shaft* High Quality Camshaft* Sold Individually* Warranty On Camshafts Against Defects In Workmanship & Material From Date Of Purchase*** High Quality Aftermarket Replacement Part (Not...
    29-07040003
    SKU:
    29-07040003
    Truck Class:
    Heavy Duty
    Make:
    Universal Items
    Product Type:
    Engine Parts
    $134.99
    Qty in Cart: 0
    Price:
    $134.99
    Subtotal:
  • BESTfit Camshaft 3690406 For Cummins ISX X15 Engines

    BESTfit Camshaft 3690406 For Cummins ISX X15 Engines

    BESTFIT TRUCK PARTS

    $1,499.99
    Replacement Cummins X15 CamshaftUpgrade your Cummins X15CM2350 engine with this high-quality camshaft. Designed for durability and performance, it ensures smooth valve operation. Shop now for...
    29-07040001
    SKU:
    29-07040001
    Make:
    Universal Items
    Truck Class:
    Heavy Duty
    Material Options:
    Steel
    Product Type:
    Engine Parts
    $1,499.99
    Qty in Cart: 0
    Price:
    $1,499.99
    Subtotal:
  • BESTfit Cam Shaft Replaces 3685963 For Cummins ISX Engines

    BESTfit Cam Shaft Replaces 3685963 For Cummins ISX Engines

    BESTFIT TRUCK PARTS

    $1,216.99
    BESTfit Cam Shaft* High Quality Camshaft* Sold Individually* Warranty On Camshafts Against Defects In Workmanship & Material From Date Of Purchase*** High Quality Aftermarket Replacement Part (Not...
    29-07040002
    SKU:
    29-07040002
    Make:
    Universal Items
    Truck Class:
    Heavy Duty
    Material Options:
    Steel
    Product Type:
    Engine Parts
    $1,216.99
    Qty in Cart: 0
    Price:
    $1,216.99
    Subtotal:
  • On Sale
    FREE SHIPPING OVER $249
    Limited Quantity Available
    3-Wire Alternator Connector W/ 1 12 AWG Lead & 2 18 AWG Leads For GM Alternators W/ Internal Voltage Regulator Replaces 12101895

    3-Wire Alternator Connector W/ 1 12 AWG Lead & 2 18 AWG Leads For GM Alternators W/ Internal Voltage Regulator Replaces 12101895

    AFTERMARKET

    Now: $5.13
    Was: $21.11
    3-Wire Alternator Connector W/ 1 12 AWG Lead & 2 18 AWG Leads Replaces 12101895 GM Alternators W/ Internal Voltage RegulatorKeep your charging system properly connected with this high-quality 3-Wire...
    29-16030005
    SKU:
    29-16030005
    Truck Class:
    Heavy Duty
    Make:
    Universal Items
    Product Type:
    Engine Parts
    Ready To Ship:
    Yes
    Now: $5.13
    Was: $21.11
    Qty in Cart: 0
    Price:
    Now: $5.13
    Was: $21.11
    Subtotal:
  • On Sale
    Limited Quantity Available
    FREE SHIPPING OVER $249
    Stainless Steel 10MM Nylon Insert Lock Nut W/ 1 Inch Diameter 6 MM Thickness

    Stainless Steel 10MM Nylon Insert Lock Nut W/ 1 Inch Diameter 6 MM Thickness

    AFTERMARKET

    Now: $0.08
    Was: $0.34
    10MM Nylon Insert Lock Nut Stainless Steel W/ 1 Inch Diameter 6 MM ThicknessThis 6MM stainless-steel lock nut has a molded nylon insert to lock a bolt into place. Its hex design allows it to be...
    1L2550000A20000
    SKU:
    1L2550000A20000
    Truck Class:
    Heavy Duty
    Material Options:
    Stainless Steel
    Make:
    Universal Items
    Ready To Ship:
    Yes
    Product Type:
    Engine Parts
    Now: $0.08
    Was: $0.34
    Qty in Cart: 0
    Price:
    Now: $0.08
    Was: $0.34
    Subtotal:
  • FREE SHIPPING OVER $249
    Ignition Switch W/ 4 Position Lock Tumbler & 4 Screw Terminals For 3/4 Inch to 1 Inch Panel Hole

    Ignition Switch W/ 4 Position Lock Tumbler & 4 Screw Terminals For 3/4 Inch to 1 Inch Panel Hole

    AFTERMARKET

    $17.13
    Ignition Switch W/ 4 Position Lock Tumbler That Fits 3/4 Inch to 1 Inch Panel HoleUniversal 4-position ignition switch fits cars, trucks, boats and heavy equipment. Features key lock security with...
    09-16200066
    SKU:
    09-16200066
    Truck Class:
    Universal
    Make:
    Universal Items
    Product Type:
    Air, Electrical, & Safety
    Ready To Ship:
    Yes
    $17.13
    Qty in Cart: 0
    Price:
    $17.13
    Subtotal:
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Adding your products to cart

Frequently Asked Questions About Mack R Truck Engine Parts & Cooling

What kinds of components are included in this category?

This category covers engine and cooling system components for Mack R Model trucks, including parts such as radiators, water pumps, fan clutches, hoses, thermostats, gaskets, oil coolers, and related engine hardware. These parts are used to keep the engine running at proper operating temperature and to support overall engine performance and longevity.

How do I know if a part will fit my specific Mack R Model truck?

Mack R Model trucks were produced over a long span of years with several engine options, so fitment can vary based on model year, engine type, and configuration. Before ordering, check the part listing for compatible engine families and specifications, and have your truck's VIN and engine identification numbers on hand. If you are unsure, reach out to our parts specialists to confirm fitment before purchasing.

Should I replace cooling system parts individually or as a set?

It depends on the issue you are addressing. If a single component, such as a water pump or thermostat, has failed, replacing that part alone is often sufficient. However, if your cooling system is older or has multiple worn components, replacing related parts like hoses, clamps, and gaskets at the same time can help prevent repeat failures and reduce additional labor down the road.

What are signs that engine cooling parts need to be replaced?

Common warning signs include engine overheating, visible coolant leaks, low coolant levels without an obvious cause, unusual noises from the fan clutch or water pump, and dashboard temperature warnings. Catching these issues early can help prevent more serious engine damage.

Are these parts new, remanufactured, or aftermarket, and does that affect quality?

Product listings will specify whether a part is new, remanufactured, or aftermarket. Each option can be a reliable choice depending on your budget and needs, but it is important to review the listing details and any included warranty information so you know exactly what you are purchasing and can make the best decision for your application.


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