Question 1

How much does a remanufactured AMC 4.2L engine cost for a 1981 Jeep CJ5?

Accepted Answer

A remanufactured AMC 4.2L engine typically costs 40-60% less than a brand new engine from the dealer, making it the most cost-effective option for your 1981 Jeep CJ5. The exact price depends on the specific configuration, condition of your core return, and current availability. For an accurate, no-obligation quote on a AMC remanufactured long block for your 1981 Jeep CJ5, 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 AMC long block engine?

Accepted Answer

A remanufactured AMC 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 AMC 4.2L 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 AMC 4.2L engine?

Accepted Answer

The most common AMC 4.2L engine problems are timing chain/belt wear, oil consumption issues, coolant leaks from gaskets, spark plug and ignition problems. These are well-documented failure points that affect many AMC 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 AMC 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 AMC engine?

Accepted Answer

Every remanufactured AMC 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 AMC 4.2L 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 passenger vehicle, truck, or commercial application. Contact us at (631) 991-7700 for specific warranty details for your 1981 Jeep CJ5.

Question 5

How long does a remanufactured AMC engine last?

Accepted Answer

A remanufactured AMC engine typically lasts 150,000 to 300,000+ miles with proper maintenance — comparable to a brand new engine. The longevity of your remanufactured AMC 4.2L 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 AMC better than a used or rebuilt engine?

Accepted Answer

Yes, a remanufactured AMC 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 AMC 4.2L 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 AMC fit my 1981 Jeep CJ5?

Accepted Answer

Yes, our remanufactured AMC long block engines are built to be a direct, bolt-in replacement for the original engine in your 1981 Jeep CJ5. We match the engine to your specific year, make, model, and configuration to ensure proper compatibility with your vehicle's computer, wiring harness, emissions equipment, and mounting points. When you call us at (631) 991-7700, our specialists will verify the exact engine configuration for your 1981 Jeep CJ5 using your VIN to ensure a perfect match.

Question 8

Do I need to return my old AMC engine core?

Accepted Answer

Yes, a core return is required when purchasing a remanufactured AMC long block engine. A refundable core deposit is collected at the time of purchase and is returned to you once we receive your old AMC 4.2L 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 AMC engine shipped?

Accepted Answer

Most remanufactured AMC engines ship within 1-3 business days with delivery in 3-7 business days to all 50 states. Expedited shipping options are available for an additional charge. Your remanufactured AMC 4.2L 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 1981 Jeep CJ5.

Question 10

How is a remanufactured AMC engine tested before shipping?

Accepted Answer

Every remanufactured AMC 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 AMC 4.2L. 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 AMC engine. We are committed to delivering engines that meet ISO 9001 quality standards.

1981 Jeep CJ5 4.2 AMC Remanufactured Long Block Engine

About This AMC Remanufactured Long Block

Common AMC Problems We Address

Engine Specifications

What's Included With Your Remanufactured Long Block

Core Components

Timing Components

Valvetrain

Seals & Lubrication

Frequently Asked Questions: 1981 Jeep CJ5 AMC Remanufactured Engine

What Our Customers Say

Warranty & Quality Assurance

Why US Engine Production?

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