The ultimate guide to identifying John Deere PowerTech Engines.

Not many Powertech engine parts are interchangeable with the older John Deere engines. So it is vital to distinguish the PowerTech series of John Deere diesel engines from the John Deere 300 series engines to ensure you order the correct parts.

The John Deere PowerTech engines share the same model designations as the 300 series but have different component parts that are not all interchangeable.

There are a number of pointers to help identify whether you have a Powertech or Liter designated 300 series engines:

The easiest way to identify your engine is to look on the valve cover for a “PowerTech.” sticker. if you are lucky it is still intact and legible.

The Engine Serial Number tag

The engine serial number can be either a one-line, or a two-line style. On either style if the number ends with a 150 or higher it is a “Powertech” engine.

The front engine mounts have an “L” shape bolt pattern for 3 mounting capscrews. The mounts will be facing outward on both sides of the engine.
The water pump is mounted on the right side in a low position integrated into the front cover.
The nose of the crankshaft has four bolts for the crankshaft pulley.
If the valve cover bolt holes run around the perimeter of the cover it is a Series 300 engine, if they run down the middle, it is a PowerTech engine.
The fuel lift pump (fuel transfer pump) is located toward the rear of the engine instead of toward the front. The “front ” is the fan end regardless of which way it faces in the equipment its mounted in. On the 300 series engine the pump is located toward the front of the engine.

Location on the fuel pump on Powertech engines

Despite a similar appearance of the Powertech and 300 series engines, many of the component parts are not interchangeable have been changed extensively including:

Block
Cylinder head
Front cover
Crankshaft
Crankshaft bearings and thrust bearings
Connecting rods and bearings
Camshaft
Balancer shafts
Pistons and liners
Flywheels
Valve covers
Thermostat housings
oil pump,
oil filters and housings
Lift pumps
Fuel injection pumps
Water pumps
Fan & water pump drive systems

300 Series: Naturally Aspirated & Turbo Engines

3 Cyl. Models: 3152, 3164, 3179, 3029
4 Cyl. Models: 4202, 4219, 4239, 4276, 4039, 4045
6 Cyl. Models: 6303, 6329, 6359, 6414, 6059, 6068

350 Series: Naturally Aspirated, Turbo & Aftercooled Engines

3 Cyl. Models: 3029 (2.9L) Powertech

4 Cyl. Models: 4045 (4.5L) Powertech
6 Cyl. Models: 6068 (6.8L) Powertech

400 Series: Naturally Aspirated, Turbo & Aftercooled Engines.

4 Cyl. Models: 4270
6 Cyl. Models: 6404, 6466, 6076

450 Series: Naturally Aspirated, Turbo & Aftercooled Engines.

6 Cyl. Models: 6081, (8.1L) Powertech

500 Series: Naturally Aspirated, Turbo & Aftercooled Engines.

6 Cyl. Models: 6531, 6619

550 Series: Naturally Aspirated, Turbo & Aftercooled Engines.

6 Cyl. Models: 6105 (10.5L) Powertech

650 Series: Naturally Aspirated, Turbo & Aftercooled Engines.

6 Cyl. Models: 6125 (12.5L) Powertech

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