Jeep Wrangler driving off-road with a 4BT Cummins engine
Call us

John Deere 4045 Engine

John Deere 4045 Engines For Sale

The John Deere 4045 is a 4.5-liter engine that comes in four models. Each model is designed to be used in smaller industrial applications and consists of some pretty 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 on both sides of the engine.  The engine also boasts impressive features such as a dynamically balanced crankshaft, forged steel connecting rods, self-adjusting poly-vee fan drive, replaceable wet-type cylinder liners, and the aforementioned either side service. These characteristics only build on the great reputation earned by John Deere, so you can bet that the 4045 is an impressive bit of kit, to say the least.

Engine Applications and Uses

  • Industrial

Common JD 4045 Engine Problems & Failures

Cataloged Below are some engine problems and failures commonly reported by people inquiring about replacing their John Deere 4045 Motor engines. Regrettably, some of the problems include those that could lead to the permanent ruin of your engine, but some, if caught early enough, may be saved.

AERA Association Member

  • Spun Crankshaft Bearings
  • Cracked Cylinder Head(s)
  • Dropped Valves
  • Camshaft Failure
  • Crankshaft Failure
  • Lifter/Roller Failure
  • Connecting Rod Failure
  • Scored Pistons and Liners
  • Over Fueling
  • Lack of oil or oil pressure
  • Extreme Blow-By

JD4045 Engine Replacement Options

When it comes to the health of your engine there could be a plethora of problems, worst-case scenario, you could be left with a problem where your only route out is complete replacement. However, less tragic situations may just require you to replace some parts or components, or maybe, your engine just needs a new lease of life requiring no more than a refreshment. We are well aware that cost, time, and availability will all affect your decision-making - so let us inform you of the pros and cons of a new engine from the dealer.

Remanufacturing Process

A remanufactured 4045 long block is a good choice for someone who has experienced an internal engine failure but has been blest with the gift of re-useable external components that may still be of use from their old motor. Long blocks are also a good option when trying to cut back on costs in the search for a new engine.

Our team of machinists and engine builders execute a full core tear down, cleaning, inspection, and machining of the engine right before it leaves our facility, ensuring excellence each and every time.

However, it is important to mention that all of our 4045 remanufactured long blocks are constructed with a combination of both reman and new parts. We refrain from reconditioning or refurbishing old engine parts, instead, we completely rebuild the old John Deere 4045 motors back to OEM specs.

Thorough Cleaning

Every 4045 engine is first entirely stripped. Blocks, heads, rods, crankshafts, and camshafts are carefully cleaned in a chemical jet wash or hot tank to remove stubborn impurities that could eventually facilitate both early component and engine failure.


Crankshafts are precision machined to exact tolerances, polished & magnafluxed, then inspected by our highly attentive quality control department.

Cylinder Heads

Heads are then resurfaced to guarantee a good sealing surface with the block and a finish compatible with today's new gasket materials. Valve height is mic-d and every head is vacuum tested to guarantee correct valve seating.

Cylinder Blocks

Blocks are subject to magnetic particles which thoroughly inspects for both cracks and imperfections. Cylinders are then bored, honed, and inspected to precise tolerances. We then execute a process that aims to eliminate the culprit of engine blow-by. This is achieved by Torque plate honing on particular engines to eliminate the chances of cylinder head distortion after the head is bolted and torqued to the block.


Camshafts are thoroughly inspected and precisely machined to provide correct lift. Lobs are measured with a micrometer to make sure OEM tolerances are met.

Connecting Rods

Connecting rods are cleansed, then machined to O.E.M. specifications before being honed to the standard diameter of original equipment for even distribution of stress on the bearings. New bushings are also fitted and machined in all bushed rods. Every rod is carefully inspected for bend and twist.

New Parts

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.

Request a Quote

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 as close to new as possible. Wearable parts are automatically replaced. All 4045 core material is thoroughly inspected and examined against the original equipment specifications for correct dimensional tolerances. Replacement parts are either new or requalified. If new, parts are made in an identical production process as the original equipment. Testing is also performed to manufacturer specifications and original production standards.

JD 4045 Long Block Parts List:

  • John Deere 4045 Engine Cylinder 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 new oil pumps, oil coolers, water pumps, turbos, injectors, and fuel pumps for an additional cost with the long block but 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 Motor Specs

Engine Data

Engine TypeIn-Line
Displacement-0.5 L (275 cu in)
Bore106 mm (4.17 in)
Stroke127 mm (5.00 in)
Compression Ratio17.0:1
AspirationTurbocharged and air-to-air aftercooled
Length867 mm (34.1 in)
Width637 mm (25.1 in)
Height979 mm (38.5 in)
Engine Weight (Dry)451 kg (994 lb)

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!

Request A Quote


Need Help Researching an Engine Swap?

Get our FREE 10-Page Buyer's Guide

    I am looking for an