John Deere 3179, 4239, 6359, 4276, 6414 Diesel Engine Service Manual (P/N 28OCT95)

This official Deere Power Systems Group Component Technical Manual, CTM4 (28OCT95), covers factory repair, overhaul, and testing for the Series 300 3179, 4239, 6359, 4276, and 6414 diesel engines. The 547-page PDF spans 179 to 414 cu. in. (2.9 to 6.8 L) and presents SI measurements followed by U.S. customary units. Deere states that the manual was written for an experienced technician; the work assumes suitable measuring equipment, safe engine-handling gear, and the specified service tools.

The 28OCT95 issue supersedes CTM4 dated 24JAN90. It incorporates revised application data and factory procedures for engine lifting, cold valve adjustment, cylinder-head work, oil-cooler and bypass configurations, water-pump sealing, aftercooler service, turbocharger bearing checks, and fuel-pump timing.

• Build and serial coverage: Matches all 179, 239, and 359 cu. in. Saran engines from serial CD394145 and up, plus Dubuque-built 239/359 and 276/414 engines in the T0 serial sequence 100001-300000. The 276/414 coverage applies to units built November 1983 or later with raised-character serial plates.

• Core engine repair: Follows cylinder-head and valve work, block/liner/piston/connecting-rod inspection, crankshaft and main-bearing service, flywheel checks, and camshaft, balancer-shaft, and timing-gear repair through removal, measurement, reassembly, and final checks.

• Lubrication and cooling configurations: Separates standard- and high-flow oil coolers, standard- and high-capacity oil pumps, bypass and pressure-regulating valves, low-flow and heavy-duty water pumps, thermostats, and coolant heaters, with the related test, overhaul, capacity, and coolant-reference data.

• Air and boost-system work: Covers K.K.K. and AiResearch/Garrett turbocharger failure analysis, radial and axial bearing checks, disassembly, center-housing replacement, prelubrication, installation, and break-in, along with crossover-tube service and 6359A aftercooler repair.

• Fuel-system procedures: Details Sofabex, AC, and Corona supply pumps; Roto Diesel/Lucas CAV and Stanadyne JDB, DB2, DB4, and DM4 injection-pump installations; static and dynamic timing; engine-speed adjustments; system bleeding; and injection-nozzle diagnosis and bench testing.

• Operation, testing, and specifications: Supplies dynamometer and break-in data, compression and oil-pressure tests, crankcase blow-by measurement, cooling-system pressure tests, turbo-boost checks, and symptom charts for engine, head-gasket, air-intake, turbocharger, supply-pump, injection-pump, and nozzle faults.

Identification and Application Matching

The identification section decodes cylinder count, cubic-inch displacement, D/T/A aspiration codes, user-factory and application codes, and the 13-digit engine serial plate. It also cross-references John Deere builds to Detroit Diesel Allison model designations. Application charts connect specific engine configurations to John Deere agricultural and industrial equipment and to OEM installations. Individual repair groups then separate procedures by cylinder count, Saran or Dubuque production, front PTO or auxiliary drive, oil-cooler arrangement, pump type, and applicable serial break.

CTM4 is a component manual, not the machine technical manual. Deere directs the technician to the applicable machine publication for in-chassis access, components serviceable without engine removal, and engine removal and installation. Its technical electrical coverage consists of engine tune-up checks and an air-filter restriction-indicator switch test rather than machine-level wiring diagrams.

Fuel-Pump Limits and Workshop References

The fuel-injection chapters cover pump identification, removal and installation, drive-shaft and drive-gear inspection, timing, and external adjustments. They do not provide an internal injection-pump overhaul: Deere directs Roto Diesel/Lucas CAV and Stanadyne pump testing, adjustment, and repair to an authorized ADS diesel injection repair station. Nozzle coverage goes further, documenting removal, test-bench checks, disassembly, inspection, cleaning, reassembly, adjustment, sealing, and installation.

Specified tooling includes the JT07158 TIME TRAC kit for dynamic timing and the JDG670A drive-gear puller. Group 199 supplies fabrication drawings for the DFRG2 injection-pump timing-mark transfer tool and DFRG3 cylinder-liner holding fixture. Technical views cover the engine sectional arrangement, 4239T lubrication flow, standard-flow and high-flow cooling circuits, the crankshaft gear-driven auxiliary drive, and operating layouts for the covered injection-pump families.

The manual flags two easy-to-miss rebuild traps. Installing the revised short oil-bypass valve in the older deep block bore leaves the valve open and sends unfiltered oil through the engine; fitting the earlier long valve in the later shallow bore prevents bypass flow. Upper and lower idler-gear bushings also use different lubrication designs, and interchanging them causes bushing failure.

Engine handling requires rated lifting and repair-stand equipment. Fuel-system pressure must be relieved before lines are disconnected, and the nozzle-test cautions address the risk of high-pressure diesel spray penetrating skin.