Name: PACCAR MX 12.9L Diesel Engine Remanufactured Long Block For Sale
Brand: PACCAR
SKU: REMAN-PACCAR-MX-48878
Price: 12000.00 USD
Availability: InStock
Rating: 4.8 (127 reviews)

Question 1

How much does a remanufactured PACCAR MX 12.9L engine cost for a 2012 Peterbilt 384?

Accepted Answer

A remanufactured PACCAR MX 12.9L engine typically costs 40-60% less than a brand new engine from the dealer, making it the most cost-effective option for your 2012 Peterbilt 384. The exact price depends on the specific configuration, condition of your core return, and current availability. For an accurate, no-obligation quote on a PACCAR MX remanufactured long block for your 2012 Peterbilt 384, call our engine specialists at (631) 991-7700 or request a quote online. We offer competitive pricing and fast delivery.

Question 2

What is included in a remanufactured PACCAR MX long block engine?

Accepted Answer

A remanufactured PACCAR MX long block includes the engine block, new pistons and rings, reground crankshaft, new bearings, camshaft, reconditioned cylinder head(s), timing components, new oil pump, and complete gasket set. Specifically, our PACCAR MX 12.9L long block comes with: precision-reground crankshaft with new main and rod bearings, new or reground camshaft, cylinder head(s) that are resurfaced and pressure tested, new timing chain or belt with gears and tensioners, new lifters, new valve seals, new front and rear main seals, and new freeze plugs. Every component meets or exceeds OEM specifications.

Question 3

What are the most common problems with the PACCAR MX 12.9L engine?

Accepted Answer

The most common PACCAR MX 12.9L engine problems are fuel injector failures affecting performance, turbocharger wear and failures, egr system problems, glow plug failures in cold weather. These are well-documented failure points that affect many PACCAR MX engines in service. Our remanufacturing process specifically addresses each of these known issues by using updated components, improved gaskets, and enhanced machining techniques. When you purchase a remanufactured PACCAR MX long block from US Engine Production, these common problems have been corrected during the rebuild process, giving you a more reliable engine than a simple repair would provide.

Question 4

What warranty comes with a remanufactured PACCAR MX engine?

Accepted Answer

Every remanufactured PACCAR MX engine from US Engine Production comes with a comprehensive parts-and-labor warranty backed by over 40 years of remanufacturing experience. Our warranty reflects our confidence in the quality of our process — every PACCAR MX 12.9L engine is dyno tested before shipping to verify horsepower, torque, oil pressure, and overall performance. Warranty terms may vary based on the specific application and whether the engine is for a commercial truck, pickup truck, or industrial application. Contact us at (631) 991-7700 for specific warranty details for your 2012 Peterbilt 384.

Question 5

How long does a remanufactured PACCAR MX engine last?

Accepted Answer

A remanufactured PACCAR MX engine typically lasts 200,000 to 500,000+ miles with proper maintenance — comparable to a brand new engine. The longevity of your remanufactured PACCAR MX 12.9L depends on regular oil changes, proper cooling system maintenance, using the correct fuel and fluids, and following the manufacturer's recommended service intervals. Our remanufactured long blocks are built to OEM specifications using all-new internal components, which is why they deliver the same service life as a factory-new engine.

Question 6

Is a remanufactured PACCAR MX better than a used or rebuilt engine?

Accepted Answer

Yes, a remanufactured PACCAR MX is significantly better than a used or rebuilt engine because every component is replaced or restored to OEM specifications. A used engine has unknown history and remaining life. A rebuilt engine only replaces worn-out parts. Our remanufactured PACCAR MX 12.9L engines are completely disassembled down to the bare block, every component is cleaned and inspected, and all wear items are replaced with new parts — including pistons, bearings, gaskets, seals, timing components, and the oil pump. The engine block and crankshaft are precision machined to factory tolerances, delivering better reliability, longer life, and a stronger warranty than used or rebuilt alternatives.

Question 7

Will a remanufactured PACCAR MX fit my 2012 Peterbilt 384?

Accepted Answer

Yes, our remanufactured PACCAR MX long block engines are built to be a direct, bolt-in replacement for the original engine in your 2012 Peterbilt 384. We match the engine to your specific year, make, model, and configuration to ensure proper compatibility with your vehicle's emissions systems (EGR, DPF, SCR/DEF), engine management computer, wiring harness, and mounting points. When you call us at (631) 991-7700, our specialists will verify the exact engine configuration for your 2012 Peterbilt 384 using your VIN to ensure a perfect match.

Question 8

Do I need to return my old PACCAR MX engine core?

Accepted Answer

Yes, a core return is required when purchasing a remanufactured PACCAR MX long block engine. A refundable core deposit is collected at the time of purchase and is returned to you once we receive your old PACCAR MX 12.9L engine in rebuildable condition. We make the core return process easy and hassle-free. The core return program helps us keep remanufactured engine prices affordable by recycling engine blocks and other reusable components. Your old engine core should be complete and not have any cracked or damaged major castings.

Question 9

How fast can I get a remanufactured PACCAR MX engine shipped?

Accepted Answer

Most remanufactured PACCAR MX engines ship within 1-3 business days with delivery in 3-7 business days to all 50 states. For commercial and fleet customers who need to minimize downtime, we also offer expedited shipping options. Your remanufactured PACCAR MX 12.9L engine is carefully crated and secured on a pallet for safe transport. Call (631) 991-7700 to check current availability and get an estimated delivery date for your 2012 Peterbilt 384.

Question 10

How is a remanufactured PACCAR MX engine tested before shipping?

Accepted Answer

Every remanufactured PACCAR MX long block engine undergoes comprehensive quality testing before it leaves our facility. This includes dynamometer (dyno) testing to verify horsepower output, torque specifications, oil pressure readings, and overall performance meet or exceed OEM specifications for the PACCAR MX 12.9L. We also perform compression testing across all cylinders, leak-down testing, cooling system pressure testing, and a thorough visual inspection. Our quality assurance process ensures that every remanufactured engine we ship performs like a factory-new PACCAR MX engine. We are committed to delivering engines that meet ISO 9001 quality standards.

2012 Peterbilt 384 MX 12.9 PACCAR Remanufactured Long Block Engine

About This PACCAR MX Remanufactured Long Block

Common PACCAR MX Problems We Address

Engine Specifications

Peterbilt Vehicle Compatibility

What's Included With Your Remanufactured Long Block

Core Components

Timing Components

Valvetrain

Seals & Lubrication

Frequently Asked Questions: 2012 Peterbilt 384 PACCAR MX Remanufactured Engine

What Our Customers Say

Warranty & Quality Assurance

Why US Engine Production?

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