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John Deere 4045 Engine

John Deere 4045 Engines For Sale

The John Deere 4045 is a 4.5-liter engine that comes in four different versions. Each model is designed to be used in small industrial applications and consists of a number of unique features that make life easier for the operator. For example, John Deere has made installation and maintenance a lot easier by providing dipstick and oil filter options for either side of the engine. The engine also boasts impressive features like a dynamically balanced crankshaft, forged-steel connecting rods, a self-adjusting, poly-vee fan drive, replaceable, wet-type cylinder liners, and the aforementioned “either side” service. The 4045 is a great reflection of the renowned reputation John Deere enjoys.

Engine Applications and Uses

  • Industrial

Common JD 4045 Engine Problems and Failures

Cataloged below, you’ll find some of the frequent engine problems and failures encountered by owners looking to replace their John Deere 4045. Unfortunately, some of the problems listed here mean that your engine has run out of time. However, under other circumstances certain parts can be salvaged if the engine failure is caught early enough.

AERA Association Member

  • Spun Crankshaft Bearings
  • Cracked Cylinder Head
  • Dropped Valves
  • Camshaft Failure
  • Crankshaft Failure
  • Lifter/Roller Failure
  • Connecting Rod Failure
  • Scored Pistons and Liners
  • Overfueling
  • Lack of oil or no oil pressure
  • Extreme Blow-By

JD4045 Engine Replacement Options

There are a host of issues that can harm your engine, but not all of them will render it unsalvageable. While certain candidates are beyond repair, at times some engines just need a few replacement parts or a simple refresh. We are well aware that cost, time, and availability will all affect your decision-making—and this is exactly why we offer remanufactured long blocks. They represent an affordable solution with quick turnaround.

The Big Bear Remanufacturing Process

For those of you that’ve had the unfortunate luck of your engine suffering a catastrophic failure, our remanufactured John Deere 4045 long block is the ideal solution. What makes the deal even sweeter is if you have re-useable external components that can be retained from your old engine. Most importantly, our long blocks are a great option if you’re trying to save some money.

Upon receiving your 4045, our team of machinists and engine builders execute a full core tear down, cleaning, inspection, and machining of the engine. All of these services are performed in-house and under one roof, which ensures a level of excellence our customers have come to expect with each and every engine we build.

It’s important to note that all of our 4045 remanufactured long blocks are built with a combination of both reman and new parts. We refrain from reconditioning or refurbishing old engine parts. Instead, we completely rebuild your old John Deere 4045 back to OEM specs.

Thorough Cleaning

Every John Deere 4045 engine is first entirely stripped. The block, head, rods, crankshaft, and camshaft are carefully cleaned in a chemical jet wash or hot tank to remove stubborn impurities that, left unnoticed, could potentially facilitate both early component and/or engine failure.


All crankshafts are precision machined to exact tolerances, polished, and then magnafluxed. Following that, the crankshaft is inspected by our highly attentive quality control department.

Cylinder Head

The head is resurfaced to guarantee a good sealing surface with the block, and a finish that’s compatible with today's latest head gasket materials. Valve height is mic’d and every head is vacuum-tested to guarantee correct valve seating.


Magnetic particle inspection is a common practice for any reputable engine build, and we magnaflux each crankcase to inspect for any cracks or damage before the rebuild commences. The cylinders are then bored, honed, and inspected to precise tolerances. After that we execute a process that aims to eliminate the culprit of engine blow-by. This is achieved by torque plate honing in order to significantly reduce the chances of cylinder distortion once the head is installed and torqued to the block.


Each camshaft is thoroughly inspected and precisely machined to provide correct lift. Lobes are measured with a micrometer to make sure OEM tolerances are met.

Connecting Rods

Connecting rods are cleaned, carefully inspected for bend and/or twist, and then machined to O.E.M. specifications before being honed to the standard diameter of original equipment for even distribution of stress across the bearings. New bushings are fitted and machined in all bushed connecting rods.

New Parts

All of our 4045 long block engines receive a standard set of new parts such as pistons and rings, bearings, gaskets and seals, and liners. New parts assure dependable performance and reliability throughout the life of your engine.

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Please fill out the form below with your information and request. A member of our staff will be with you shortly.

Remanufactured Engines Standards

We believe that to remanufacture is to make your engine as close to new as possible. All wearable parts are automatically replaced. Each 4045’s core materials are thoroughly inspected and examined against the original equipment specifications for correct dimensional tolerances. Every replacement part is either new or requalified. If new, parts are made by employing the same production process(es) as the original equipment. Testing is also performed to manufacturer specifications and original production standards.

John Deere 4045 Long Block Parts List:

  • John Deere 4045 Engine Block
  • Complete, Loaded Cylinder Head
  • Crankshaft
  • Connecting Rods
  • Pistons
  • Liners
  • Rings
  • Intermediate Cover
  • Timed Front Gear Group
  • New Upper and Lower Gasket Set
  • Camshaft
  • Followers/Lifters
  • **1 Year Warranty

*Note: We can provide a new oil pump, oil cooler, water pump, turbo, injectors, and fuel pump for an additional cost with the long block, but these components will not come assembled to the engine.

**First 6 Months Parts & Labor, Second 6 Months Parts Replacement Only. Ask your sales representative for a full copy of our remanufactured long block warranty.

John Deere 4045 Engine Specs

Engine Data

Engine TypeInline, Diesel, Four-stroke
Displacement4.5L (275 ci)
Bore4.17-inch (106 mm)
Stroke5.00-inch (127 mm)
Compression Ratio17.0:1
AspirationTurbocharged and air-to-air aftercooled
Length34.1-inch (867 mm)
Width25.1-inch (637 mm)
Height38.5-inch (979 mm)
Engine Weight (Dry)994 lbs (451 kg)

Give us a call today at 844-340-4114 to view our John Deere 4045 engines for sale, or for immediate sales and support for the Cummins 4BT, Cummins 6BT, 6CT, ISC, 855, QSB 4.5 L or CAT 3306. If you have any questions, check out our FAQ Page. We are always ready to help, or just listen to your crazy off-roading adventures!

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