1990–1995 John Deere 300 Series Diesel Engines 3179, 4239, 6359, 4276, 6414 Component Technical Manual (CTM4)

The 1990–1995 John Deere 300 Series Diesel Engines Component Technical Manual, publication CTM4 (28OCT95), covers the 3179, 4239, 6359, 4276, and 6414 engines. This October 1995 edition combines component repair procedures with system operation and diagnostic tests for naturally aspirated, turbocharged, and air-to-coolant aftercooled versions.

• Cylinder head and valves: Head removal, valve and seat inspection, rocker arm service, and conventional or torque-turn tightening procedures matched to the cylinder head design.
• Block and rotating assembly: Cylinder liner replacement, piston and connecting rod inspection, crankshaft measurement, main bearing installation, flywheel service, and rear oil seal replacement.
• Camshaft and timing gears: Camshaft inspection, balancer shaft installation and timing, front plate replacement, and service procedures for the auxiliary gear drive.
• Lubrication and cooling: Oil pump inspection and overhaul, oil cooler service, thermostat testing, water pump rebuilding, and checks for cooling system leaks.
• Air intake and exhaust: K.K.K. and AiResearch/Garrett turbocharger inspections, center housing and rotating assembly replacement, manifold service, and aftercooler leak testing.
• Fuel system and engine testing: Injection pump timing, nozzle bench testing, fuel supply pump checks, compression diagnosis, dynamometer testing, and engine break-in procedures.

Written for experienced technicians, this manual assumes familiarity with diesel engine service and access to the specified measuring equipment and special tools.

Cylinder Head, Crankshaft, and Timing Gear Service

Engine sectional views support the repair procedures for cylinder heads, valve trains, pistons, rods, and crankshafts. Separate instructions address cylinder head bolt designs, unitized rear crankshaft seals, and front plate and timing gear variations.

Sealing and assembly: Torque tables and sealant application charts identify the relevant fasteners and joints. The liner installation notes explain how petroleum products can swell the red or white packing O-rings and damage them during assembly.

Balancer shafts: The instructions distinguish the left and right shafts; reversing them can cause premature journal and bushing wear.

Application charts connect Saran- and Dubuque-built engine codes to agricultural, industrial, and OEM applications. Engine mounting and lifting instructions are included; component access and engine removal from, or installation in, a machine require that machine’s technical manual.

Turbocharger Diagnosis and Cooling System Repairs

The turbocharger seven-step inspection and failure analysis charts help distinguish turbocharger damage from problems elsewhere in the engine before replacement. The documented repair includes housing inspection and replacement of the center housing and rotating assembly; complete internal disassembly requires specialized tooling and training.

Lubrication-flow illustrations and cooling circuit diagrams show how oil and coolant reach the engine components. Water pump procedures distinguish low-flow and high-flow designs, including heavy-duty pumps and unitized seal arrangements.

Injection Pump Timing and Nozzle Testing

Stanadyne JDB, DB2, DB4, and DM4 pump procedures sit alongside Roto Diesel/Lucas CAV coverage. The instructions distinguish retained and non-retained drive shafts and explain static timing and dynamic timing with the JT07158 TIME TRAC kit.

Dynamic timing settings depend on the engine and pump application; some applications use static timing because dynamic values are unavailable. Internal injection pump repair and calibration are referred to authorized diesel service facilities.

Fuel diagnosis: Injection pump cutaways explain operation, while troubleshooting charts connect starting, smoke, and power complaints with possible faults. Nozzle procedures cover spray pattern, leakage, opening pressure, cleaning, and adjustment; fuel supply pump testing and engine dynamometer checks support further diagnosis.

The fuel service sections address the risk of pressurized fuel penetrating skin and the pressure-relief precautions associated with opening lines.

Selected Camshaft and Turbocharger Inspection Values

A small selection illustrates the measurement detail in the repair sections. Camshaft end play is specified at 0.08–0.23 mm (0.003–0.009 in.), with a separate wear limit of 0.38 mm (0.015 in.).

For the AiResearch/Garrett TA25 turbocharger used on 3179 engines, radial bearing clearance is 0.06–0.13 mm (0.0024–0.0051 in.). Axial end play is 0.025–0.09 mm (0.001–0.0035 in.); these TA25 values are distinct from those listed for other turbocharger applications.

PDF Navigation and Page Contents

Search and bookmarks: Selectable text supports searches for component names and procedure headings. PDF bookmarks provide navigation through the repair groups, test sections, and index. Text and tables are clear; enlarging detailed pump cutaways helps read the smaller callouts.

The download contains one printable, English-language, 547-page PDF. The total includes both cover pages, the original introductory material, contents, index, and ten divider pages.