Daewoo D1146/T & D2366/T Diesel Engine Service Manual

This Daewoo service manual covers the D1146, D1146T, D2366, and D2366T diesel engines, including naturally aspirated and turbocharged versions.

PDF Search, Diagram Detail and Included Pages

Search and circuit labels: PDF text search is not available, and there are no usable embedded bookmarks. Small circuit labels require zooming; some lettering in the regulator diagrams remains soft.

One printable, 197-page PDF in English. The total includes a 15-page torque and maintenance-specification supplement, six conversion-table pages, one network-information page, and six blank pages.

Engine Overhaul, Diesel Fuel Equipment and Electrical Service

These selected topics outline the workshop coverage rather than reproduce the full contents. Other subjects include radiator-cap testing and fan-belt inspection.

• Engine overhaul: Engine removal outlines, step-by-step disassembly and reassembly, cylinder-head service, liner and piston inspection, crankshaft measurement, and timing-gear installation.

• Cooling system: Water-pump disassembly, inspection and reassembly, thermostat testing, and separate component views for the two engine families.

• Lubrication: Gear-type oil-pump inspection, full-flow filter service, oil-cooler components, relief and bypass valves, and low-oil-pressure troubleshooting.

• Fuel equipment: PE-P injection-pump overhaul and calibration procedures, RFD/RFD-K governor adjustment, automatic-timer testing, feed-pump service, and injection-nozzle testing.

• Engine electrical: Alternator inspection and repair, Tirrill regulator adjustment, starter component tests, troubleshooting tables, and intake-heater wiring diagrams.

• Turbocharger service: Axial and radial bearing-clearance checks, disassembly, wheel and housing inspection, reassembly, lubrication checks, and installation precautions.

This manual is suited to diesel technicians familiar with precision engine measurement; injection-pump and governor calibration requires a dedicated pump test stand.

Engine Inspection and Rebuild Planning

Removal and installation outlines cover trucks and front- and rear-engine buses. The detailed overhaul sections provide inspection criteria for the engine's internal components.

The wear limits let you compare measurements on pistons, connecting rods, and crankshaft bearings when deciding which bottom-end components can be reused. The inspection sections distinguish assembly standards from service limits and include bearing-clearance measurement with Plastigauge.

Cylinder-head bolt tightening sequences, valve timing data, valve-clearance adjustment, and cylinder compression testing support reassembly and final checks. Engine performance curves and sectional engine views provide additional reference for the Toroidal combustion system and internal layout.

Troubleshooting tables link hard starting, rough idling, low power, abnormal noise, excessive fuel or oil consumption, and exhaust smoke to possible causes and corrective work. They support fault isolation before major disassembly.

Injection-Pump Timing and Fuel-System Calibration

The engine assembly section covers injection-pump mounting-bracket shims and coupling alignment, followed by injection timing adjustment using the spill method. Fuel-system air bleeding is also described.

The separate fuel chapter goes into plunger and delivery-valve inspection, control-rod travel, injection-volume adjustment, and governor settings. RFD-K-specific torque-control procedures are distinguished from adjustments shared with RFD governors.

The governor adjustment charts use lettered speed and control-rod references; numerical pump-specific calibration sheets are not included.

Automatic-timer coverage includes stroboscopic advance-angle testing and a timer characteristic diagram. Feed-pump suction, delivery, and sealing tests complement nozzle opening-pressure checks and spray-pattern drawings.

Cooling, Oil Circulation and Turbocharger Variants

Cooling-system flow diagrams show how the radiator, cylinder block, head, and oil cooler connect in each engine family. The lubrication section adds oil-pump configurations and separate filter/cooler assemblies, with inspection criteria for pump gears and shafts.

Turbocharger specifications identify the RHC7 for D1146T and RHB8A for D2366T. The service text covers full-floating bearings, seals, oil supply, and installation alignment. Its housing-handling cautions explain how distorted wheel blades can throw the rotating assembly out of balance.

Charging, Starting and Intake Heating

Alternator coverage includes rotor and stator continuity and insulation tests, brush inspection, and diode test circuits. The regulator chapter explains Tirrill and transistor designs; the detailed Tirrill servicing procedure applies to heavy-duty truck installations.

Starter coverage includes armature, brush, overrunning-clutch, and magnetic-switch tests. Printed pages 154–155 are absent from the starter chapter, including its referenced specification page and opening disassembly text; separate starter service values remain in the supplement.

The intake-heater section explains the fuel-fed preheating system and magnetic valve, with its circuit diagram and model-specific assembly views. Follow the manual's precautions for high-pressure fuel spray and rotating electrical equipment.

A Preview of Crankshaft and Bearing Specifications

Main-bearing oil-clearance assembly standards are 0.052–0.122 mm for D1146/T and 0.072–0.142 mm for D2366/T. These accompany measurement procedures and undersize-bearing tables for assessing crankshaft and bearing fit.

For crankshaft regrinding, the manual specifies fillet radii of 4.0 mm at the journals and 4.5 mm at the crankpins. Its caution explains that an undersized radius can lead to shaft breakage, while an oversized radius can interfere with the bearing.