John Deere Series 300 Diesel Engines 3179 4239 6359 4276 6414 Technical Manual CTM4

What's Covered in This Manual

This is the official John Deere CTM4 Component Technical Manual covering the Series 300 family of diesel engines: the 3179, 4239, 6359, 4276, and 6414. Published by John Deere's Power Systems Group, this is a component technical manual rather than a single-machine manual, meaning it's written as a stand-alone engine reference intended to be used alongside the specific machine technical manual for whatever equipment one of these engines is installed in - from tractors to industrial and construction equipment that shared this engine platform.

The manual follows John Deere's standard technical manual structure: safety information first, then engine specifications, followed by full theory of operation, diagnostics, and complete repair procedures for the fuel system, cooling system, lubrication system, and the core engine mechanical components - cylinder block, heads, pistons, crankshaft, camshaft, and valve train. Essential special tools, torque values, and wear tolerances are called out at the start of each repair group so a rebuild comes back within factory spec.

Because the Series 300 engine family was used across a wide range of John Deere machines, this manual is built to apply broadly rather than to one specific piece of equipment - the application listing in the introduction identifies which machines used which specific engine model in the family. Anyone doing engine diagnostics, a mid-level repair, or a complete rebuild on a 3179, 4239, 6359, 4276, or 6414 will find the full factory procedure here.

Table of Contents

• Introduction - How to use this manual, application listing, safety messages
• Specifications - Engine specifications for each model in the Series 300 family
• Theory of Operation - Fuel, cooling, and lubrication system operation
• Diagnostics - Troubleshooting procedures
• Repair - Cylinder block, heads, crankshaft, camshaft, valve train, fuel and cooling system repair