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Cummins Trucking - Common Parts, Makes, Models, and Replacements.


Cummins is perhaps the most popular brand in the heavy-duty trucking industry, well known for its reliable and powerful diesel engines. Here's an overview of some common Cummins engines and the typical parts that need replacement over time:

Common Cummins Engines

1. Cummins X15 eBay - Amazon
Popular for long-haul applications.
Known for its fuel efficiency and durability.
Offers a range of horsepower and torque options, making it versatile for different trucking needs.

2. Cummins ISX15 eBay - Amazon
One of the most widely used engines in heavy-duty trucks.
Offers a balance of power and fuel efficiency.
Known for its advanced emissions control systems.

3. Cummins ISX12 eBay - Amazon
A smaller alternative to the ISX15, used in regional haul and vocational applications.
Provides good power-to-weight ratio and is known for its reliability.

4. Cummins L9 eBay - Amazon
Common in medium-duty applications and vocational trucks.
Known for its versatility and lower operating costs.

5. Cummins B6.7 eBay - Amazon
Widely used in medium-duty trucks and buses.
Known for its reliability and long service life.

Common Cummins Engine Part Replacements Parts and Model Numbers 

These parts are frequently replaced or maintained during the life of the engine:

1. Fuel Injectors
Fuel injectors are critical for proper engine performance, and they can wear out over time.
Common issues include clogging, leaking, or failing to open/close properly.
Cummins ISX15 Injector: Part Number 2872068 eBay - Amazon
Cummins ISX12 Injector: Part Number 4955524 eBay - Amazon

2. Turbocharger
The turbocharger helps boost engine power and efficiency but can wear out due to high temperatures and pressures.
Common issues include bearing failure, oil leaks, and compressor/turbine damage.
Cummins ISX15 Turbocharger: Part Number 4040283 eBay - Amazon
Cummins ISX12 Turbocharger: Part Number 4309076 eBay - Amazon

3. EGR (Exhaust Gas Recirculation) Valve
The EGR valve helps reduce emissions by recirculating exhaust gases back into the engine.
Common failures include clogging due to soot buildup or valve sticking.
Cummins ISX15 EGR Valve: Part Number 4309504 eBay - Amazon
Cummins ISX12 EGR Valve: Part Number 4387373 eBay - Amazon

4. DPF (Diesel Particulate Filter)
The DPF traps soot and other particulates from the exhaust to reduce emissions.
Over time, the filter can become clogged and may need cleaning or replacement.
Cummins ISX15 DPF: Part Number 4969706 eBay - Amazon
Cummins L9 DPF: Part Number 5295602 eBay - Amazon

5. Water Pump
The water pump is crucial for maintaining engine temperature by circulating coolant.
Common issues include leaks, bearing failure, and impeller wear.
Cummins ISX15 Water Pump: Part Number 3692617 eBay - Amazon
Cummins ISX12 Water Pump: Part Number 4955709 eBay - Amazon

6. Oil Cooler
The oil cooler helps maintain the engine's oil temperature, preventing overheating.
Common failures include leaks or clogging, which can lead to engine overheating.
Cummins ISX15 Oil Cooler: Part Number 3683782 eBay - Amazon
Cummins B6.7 Oil Cooler: Part Number 3966365 eBay - Amazon

7. Sensors (NOx, EGT, MAP, etc.)
Various sensors monitor engine performance and emissions.
Common sensor failures can cause engine performance issues and trigger warning lights.
NOx Sensor for Cummins ISX15: Part Number 4326869 eBay - Amazon
EGT (Exhaust Gas Temperature) Sensor: Part Number 2872277 eBay - Amazon
MAP (Manifold Absolute Pressure) Sensor for ISX15: Part Number 4921473 eBay - Amazon

8. Valve Train Components (Rocker Arms, Lifters, etc.)
The valve train controls the opening and closing of the engine's intake and exhaust valves.
Wear and tear on components like rocker arms, lifters, and pushrods can lead to engine misfires or loss of power.
Cummins ISX15 Rocker Arm: Part Number 3682147 eBay - Amazon
Cummins ISX15 Lifter: Part Number 2871475 eBay - Amazon

9. Timing Components (Gears, Chains, Tensioners)
The timing components synchronize the engine's camshaft and crankshaft.
Common issues include chain/belt wear, tensioner failure, or gear wear, leading to poor engine timing.
Cummins ISX15 Timing Gear: Part Number 3681328 eBay - Amazon
Cummins Timing Belt Kit (for ISX15): Part Number 3102883 eBay - Amazon

10. Head Gasket
The head gasket seals the engine block and cylinder head, preventing coolant and oil leaks.
Over time, the head gasket can fail, leading to leaks and potential engine overheating.
Cummins ISX15 Head Gasket: Part Number 3683510 eBay - Amazon
Cummins L9 Head Gasket: Part Number 4089758 eBay - Amazon

11. Crankshaft and Camshaft Seals
These seals prevent oil leaks at the front and rear of the engine.
Common issues include seal wear or hardening, leading to oil leaks.
Cummins ISX15 Front Crankshaft Seal: Part Number 3680502 eBay - Amazon
Cummins ISX15 Rear Crankshaft Seal: Part Number 3680503 eBay - Amazon

Cummins engines are known for their durability and long service life, but regular maintenance and timely replacement of worn-out parts are crucial for optimal performance.

These part numbers can vary slightly depending on the engine variant, year of manufacture, and any updates Cummins may have made to the components.


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