JJ Engine Parts
Cummins ISX12 OEM Diesel Engine Wiring Harness 2892043 4374079 CM2250
$1,000.00Unit price /Unavailable- Sold out
JJ Engine Parts
Allison MT653 with PTO Automatic Transmission 2410309871
$1,500.00Unit price /Unavailable - Sold out
JJ Engine Parts
Mercedes Benz OM904LA Engine Control Module ECM ECU 0014466540
$550.00Unit price /Unavailable JJ Engine Parts
Denso Fuel Pump for Isuzu 6HK1 Engine 8-97602049-3 294050-0023
$650.00Unit price /UnavailableJJ Engine Parts
SEG Alternator for Isuzu NPR NRR NQP FTR with 5.2L Engine 8982486210 12V 140AMPS
$350.00Unit price /UnavailableJJ Engine Parts
Detroit DD15 Diesel Engine Control Module ECM ECU A0014462835
$800.00Unit price /UnavailableJJ Engine Parts
Isuzu NPR NQR NRR Alternator for Isuzu 4.8L 5.2L 8972489141 8973515740
$250.00Unit price /Unavailable- Sold out
JJ Engine Parts
Paccar MX-13 Diesel Engine EGR Valve Back Pressure Valve 1952320
$890.00Unit price /Unavailable JJ Engine Parts
International Maxxforce 13 Diesel Engine Exhaust Manifold 3012828C2
$150.00Unit price /UnavailableJJ Engine Parts
International Maxxforce 13 Diesel Engine Exhaust Manifold 3005196C1
$150.00Unit price /UnavailableJJ Engine Parts
Freightliner OEM Right Side Black Power Door Mirror A22-78606-005
$225.00Unit price /Unavailable- Sold out
JJ Engine Parts
Mack E7 Diesel Engine Control Module ECM ECU 12MS518BM
$800.00Unit price /Unavailable JJ Engine Parts
Freightliner Footwell Dome Light Switch A06-90128-055
$15.00Unit price /UnavailableJJ Engine Parts
Freightliner Modular Switch Field, Multiplex, Light Test A06-90128-029
$30.00Unit price /Unavailable

Used Diesel Engine Parts for Trucks & Fleet Repairs
JJ Engine Parts supports fleet operators, repair shops, and independent diesel mechanics who need dependable used diesel engine parts. Whether you are sourcing Cummins or Detroit engine parts, or supporting other diesel platforms, selecting the correct component is critical.
That’s why we focus on parts that match OEM specifications and real-world applications. Our inventory is structured to help customers quickly find the right solution for rebuilds, replacements, and legacy engine repairs.
Used Engine Components Available
Our collection includes used truck engine parts for sale that are commonly required in diesel repair and maintenance. Availability changes based on inventory, but supported components often include:
- Used ECM ECU for sale (OEM and inspected used options)
- Used turbochargers for sale
- Cooling system components
- Affordable used engine parts for budget-conscious repairs
- Used OEM components for major diesel platforms, including Detroit and Cummins engine parts
Each listing is reviewed for compatibility with specific engine models whenever possible and verified prior to shipment.

Nationwide Shipping & Fitment Assistance at JJ Engine Parts
We ship used diesel engine parts across the United States, depending on part size and destination. JJ Engine Parts regularly supports major diesel platforms, including Cummins, Detroit Diesel, Caterpillar, Volvo, and PACCAR engines. Browse our selection of used engine parts, or contact our team to help you source the right component for your diesel truck.
Frequently Asked Questions About Used Engine Parts
How do I find the correct used engine part?
How do I find the correct used engine part?
Fitment depends on your engine model and serial number. Contact us for assistance before ordering.
Are used ECM or ECU units available?
Are used ECM or ECU units available?
Yes. Used ECM ECU units are available in OEM and inspected options when in stock.
Do you sell used turbochargers?
Do you sell used turbochargers?
Yes. Used turbochargers are offered based on availability.
Are used OEM engine components reliable?
Are used OEM engine components reliable?
When properly inspected and matched to the correct engine, used OEM components can provide dependable performance.
Do you ship used truck engine parts nationwide?
Do you ship used truck engine parts nationwide?
Yes, we ship used engine parts across the United States, depending on part size and destination.