John Deere 300 Series Diesel Engines 3179, 4239, 6359, 4276, 6414 Service Manual (CTM4)

• Covers John Deere 300 Series Diesel Engines (3179, 4239, 6359, 4276, and 6414 configurations) in both naturally aspirated and turbocharged variants
• Official OEM publication CTM4, revised October 1995
• Delivers 547 pages of comprehensive service documentation and testing protocols across 199 technical groups, featuring exploded views, torque-turn specifications, and dynamic timing procedures
• Supersedes all earlier editions to provide the precise dynamic timing values required for 14B-series and later engine builds
• Details the servicing of Stanadyne injection pumps, Roto Diesel/Lucas CAV injection pumps, K.K.K. turbochargers, AiResearch/Garrett turbochargers, balancer shafts, timing gear trains, fuel supply pumps, and high-flow water pumps
• Features comprehensive visual aids including engine sectional views, engine application charts, failure analysis charts, dynamometer test specifications charts, diagnostic charts, wear tolerance charts, and cooling system schematics

Engine Service and Rebuild Overview

Tearing down a John Deere diesel engine requires precise factory data. This PDF reference material details exactly what you will find inside the 300 Series family documentation. It breaks down the required service parameters for cylinder heads, valve trains, lubrication networks, and cooling components. Need to overhaul a turbocharger? The text outlines the specific OEM rebuilding sequences for servicing crankshafts, pistons, connecting rods, and turbo assemblies, ensuring your work aligns perfectly with original factory standards. By providing step-by-step instructions for tasks that normally require an expensive trip to a specialized diesel facility—such as executing dynamic injection pump timing with a TIME TRAC® kit, performing a turbocharger seven-step inspection, and testing fuel injection nozzles—this guide allows technicians to keep complex calibrations in-house and prevent costly delays.

Working on heavy-duty diesel equipment exposes mechanics to extreme mechanical forces and high-pressure fuel systems. Because escaping diesel fuel under pressure can penetrate the skin and cause severe injury, safely relieving system pressure is essential before any repair work begins. To support safe handling, the manual documents approved engine mounting procedures and heavy-lifting techniques.

It also features comprehensive sealant application charts. These tables specify the correct thread lockers and gasket sealants for every single fastener. For accurate identification across mixed fleets, the guide breaks down the data plates for engines assembled at both the Dubuque and Saran facilities, covering various agricultural and industrial machinery applications.

Specifications and Technical Highlights

Having the right numbers is the difference between a reliable engine repair and a costly comeback. This manual delivers the critical measurements necessary for a successful overhaul, listing precise technical data for valve clearance, cylinder head flatness, and valve stem dimensions.

Need the flywheel housing cap screw torque? It is rated exactly at 135 N·m (100 lb-ft). Intake valve clearance for the 300 Series sits at a strict 0.35 mm (0.014 in.), and crankcase oil fill capacity clocks in at 10.5 L. The manual also outlines complex multi-stage torque sequences. Mechanics can quickly reference that 112 mm flanged-head cylinder head bolts require a highly specific tightening pattern, culminating in final-stage angles between 50° and 70°.