John Deere News

John Deere parts for engines are provided for all major models, including the six (6) cylinders, and four (4) cylinder engines, for tractors, combines, harvesters, marine, excavators, wheel loaders, skid steers and other construction equipment.
John Deere Parts for engines needs to be identified as either for a non PowerTech engine or a PowerTech engine.

This identification can best be done on the engine identification tag:- the engine is labeled as PowerTech. Alternatively, an analysis of the serial numbers of the engines can determine is the engine is PowerTech or non-PowerTech. All John Deere engines manufactured in Torreon, Mexico, are PowerTech engines. The others have serial number breaks that determine this. This factor is significant, as a 4045 engine can be either PowerTech or a normally aspirated non-PowerTech engine.

Replacement parts for both can be significantly different, as both engines were designed for different applications and to different standards. Engine parts can be either in the engine itself, or accessories to the engine, fitted to the external body of the engine.
John Deere Engine Parts parts for overhaul kits are typically sold with pistons, piston pins, piston pin retainers, rings, liners (cylinders of sleeves), o ring kit, main bearings, connecting rod bearings, connecting rod bushings and bolts, rear crankshaft seal, front crankshaft seal, and thrust washers.

The complete gasket overhaul set includes the head gasket set, lower oil pan set, and other gaskets for water pump, oil pump, hydraulic pumps, injector grommets, and exhaust manifold gaskets. The external engine accessories can include the injectors, new, rebuilt or good used, crankshafts, oil pump, tachometer cable, exhaust manifold, timing chain gear, flywheel, ring gear, fuel lift pump, carb kit, gauges, sending units and sensors, and valve train kits.

Valve train kits includes exhaust valves, intake valves, valve seals, valve springs, valve intake guide, valve exhaust guide, and lock valves. Some of the early John Deere engines were built for gas, as in the early tractors.

Gas engine parts are sold aftermarket, as well as John Deere diesel engine parts. Camshaft, rocker shafts, tappets, and rocker arm bolts are provided aftermarket. Connecting rods are sold new aftermarket, rebuilt, or good used. Cylinder heads, glow plugs, cylinder blocks, short block, long block, short block, crankshaft gears, alternators, starters, fan belts, water pumps, and water pump kits are readily sold as aftermarket.

These engines are now manufactured in accordance with Tier 11 and Tier 111 EPA emissions standards. These are standards that were introduced gradually by the US EPA to reduce emissions/pollution from diesel combustion engines. The choice of the correct replacement John Deere Parts for engines will depend on the information provided by the machine/engine owner.

As a rule, the machine/engine serial number is not sufficient to select engine parts. John Deere engines are renowned for requiring the casting number that is embedded onto engine components. These include the piston, connecting rod, crankshaft, cylinder head, cylinder block, and water pump housings. Notwithstanding the above, the machine serial number and the engine serial number are added pieces of information that are needed for correct component replacement.

A unique feature of John Deere engines is that the engines are designated differently based upon the type of the air intake systems used in its varied industrial, construction, agricultural, oil and gas or other applications. Understanding these different designations is crucial in deciphering the application of the engine and in identifying the correct maintenance parts.

The five (5) different designations that are used for John Deere engines are D, T, A, S and H. The D is the oldest and simplest air intake system for John Deere engines. This is a an engine whereby the reciprocating positions will pull air into the air intake system directly through an air filter, and directly into the combustion chamber where combustion occurs.

The T designated engines are all turbocharged engines. The turbocharged engine process was a later addition to the "D" engines to reduce fuel combustion and boost engine power. The turbocharged unit is fitted between the air intake system and the ducts leading to the combustion chamber. Exhaust gases are channeled through radial placed vanes on a shaft, which produced motion in one side of the turbocharged unit. The central shaft then turns a compressor in the second section of the turbocharger, pulling filtered air in and compressing it to a high density. The high density air is then compressed into the combustion chamber. The higher air density ensures more efficient fuel combustion and improved fuel economy.

The third John Deere engine designation is A. The A abbreviation is an indication that the engine is fitted with a turbocharger and an Aftercooler, and the cooling medium in the engine is air to water/coolant. The aftercooler is a cooling device like a radiator with its cooling medium being coolant or water.

In the John Deere 4650 tractor, the intercooler fits into the intake manifold of the engine and cools the compressed air that's being routed from the turbocharger before it enters the combustion chamber. In the turbocharger, the compressed air makes it denser; however, the temperature of the air has also increased. However, hot air will expand less when burned in the combustion chamber and may also cause diesel knock. The liquid coolant intercooler is used to reduce the temperature of the compressed air to prevent these combustion problems.

The H designation John Deere engine abbreviation is another option to the A engine in that the engine is fitted with an intercooler, however, the cooling medium in the H engine is air. Ambient air is forced into the tubes of the intercooler, absorbing the heat of the compressed turbocharged air, and then being discharged. The H engine aftercooling system is called "air to air".

The final designation of John Deere engines is the S designation. The S John Deere engines are the marine engines, and the S symbol indicates that the marine engine is turbocharged and aftercooled, however cooled by a combination of air and seawater. There are different configurations of this cooling system, which may include additional pumps and pipes to pull in seawater and then to expel the heated water back into the river or sea.