Yunnei D20 Series China VI Diesel Engine Service Manual YND20 D20TCIF PDF
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Official Kunming Yunnei Power D20 Series China VI diesel engine service manual covering the D20TCIF model. Includes complete technical specifications, full disassembly & assembly procedures, BOSCH common-rail system setup, DOC+DPF+SCR+ASC aftertreatment maintenance, ECU fault code tables, troubleshooting for 20 fault categories, and engine storage procedures. Essential reference for technicians servicing YND20 / D20TCIF engines in pickup trucks and light commercial vehicles. Instant PDF download — 179 pages.
Description
Yunnei D20 Series China VI Diesel Engine Service Manual YND20 D20TCIF PDF DOWNLOAD
DESCRIPTION
Yunnei D20 Series China VI Diesel Engine — Official Service Manual (PDF Download)
This is the complete official service manual for the Kunming Yunnei Power Co., Ltd. D20 Series China VI Diesel Engine, model D20TCIF — a modern, electronically controlled, high-pressure common-rail diesel engine built on the proven D19TCI platform in collaboration with FEV. Designed for professional maintenance technicians, diesel mechanics, and authorized Yunnei service stations, this 179-page manual delivers factory-level guidance on every aspect of engine servicing — from assembly and calibration to BOSCH common-rail diagnostics and China VI aftertreatment system maintenance.
The YND20 D20TCIF engine powers the latest generation of light commercial vehicles including pickup trucks and light trucks, meeting the stringent China VI (National VI) emission standards through its integrated DOC + DPF + SCR + ASC aftertreatment system. With real-world testing validated at extreme conditions (+40°C high temperature, 4500m plateau altitude, and -25°C high cold), this engine is built for demanding operating environments.
📋 File Details
| Field | Details |
|---|---|
| Manual Name | Yunnei D20 Series China VI Diesel Engine Service Manual |
| Models Covered | D20TCIF (YND20 / D20 Series) |
| Manufacturer | Kunming Yunnei Power Co., Ltd. |
| Emission Standard | China VI (National VI) |
| Applications | Pickup trucks, light commercial vehicles |
| PDF Quality | High-quality, clean text — fully readable |
| Number of Pages | 179 pages |
| File Format | |
| Language | English |
⚙️ Engine Technical Specifications at a Glance
| Parameter | Specification |
|---|---|
| Model | D20TCIF |
| Engine Type | In-line, 4-cylinder, 4-stroke, water-cooled, supercharged + mid-cooled, high-pressure common rail |
| Displacement | 1.999 L |
| Bore × Stroke | 81 × 97 mm |
| Compression Ratio | 16.2:1 |
| Rated Power / Speed | 93 kW / 3200 rpm |
| Maximum Torque / Speed | 350 N·m / 1600–2500 rpm |
| Low Idling Speed | 800 rpm |
| High Idling Speed | ≤3520 rpm |
| Combustion Chamber | Direct injection |
| Fuel Injection System | BOSCH electronically controlled high-pressure common rail |
| Fuel Injector Model | CRI1-20 (electronically controlled) |
| High-Pressure Fuel Rail | HFR-20 (hot forging rail, 200 MPa rated pressure) |
| High-Pressure Oil Pump | CB4 (common-rail type) |
| Cylinder Firing Order | 1-3-4-2 |
| Lubrication | Pressure-spatter mixing |
| Cooling | Forced circulation, water-cooled |
| Engine Oil Capacity | 5.5 L |
| Aftertreatment System | DOC + DPF + SCR + ASC |
| Emission Standard | China VI |
| Minimum Fuel Consumption | ≤205 g/kW·h |
| Net Weight | 210–250 kg |
| Starting Motor | QDJ2581 (24V / 3.7 kW) |
| Charging Generator | 70A / 28.5V silicon rectifier |
| Thermostat Opening Temp | 78±2°C (full open: 92°C) |
| Accessory Belt | 6PK2660 poly V-belt |
📚 Complete Table of Contents
Front Matter
- Introduction — Engine background, D19TCI development with FEV, China VI compliance
- Foreword — Manual purpose and scope
- Notice — 9 key safety and operating precautions
Chapter I — Main Technical Specifications and Data
- Main Technical Specifications (D20TCIF full spec table)
- Specifications of Main Accessories (fuel pump, injector, water pump, oil pump, ECU, sensors)
- Technical Parameters of Electric Control System (ECU, sensors, fuel rail)
- Main Technical Data
- Size, Fit Clearance and Wear Limits of Main Parts
Chapter II — Disassembly
- Maintenance requirements and precautions of engine
- Disassembly of engine assembly (complete procedure)
- Disassembly of engine assemblies (component level)
Chapter III — Assembly
- Assembly of piston cooling nozzle, crankshaft, flywheel and clutch assembly
- Assembly of piston rod unit
- Assembly of oil pump and pressure regulating valve
- Subassembly and assembly of cylinder head
- Assembly of water pump, oil pump, gear housing and flywheel housing
- Assembly of timing linkage and chain cover
- Assembly of valve cage cover, oil module assembly, oil pan and flywheel assembly
- Installation of intake & exhaust system and fuel system
- Cooling system assembly
- EGR system assembly
- Installation of accessories
- Installation, use and maintenance of BOSCH electronic-control high-pressure common-rail system (detailed section)
- Installation and adjustment of engine assembly
Chapter IV — Maintenance and Inspection
- Engine body assembly
- Cylinder head
- Valve timing mechanism
- Crankshaft, flywheel and clutch
- Piston rod assembly
- Transmission gear train
- Lubrication system
- Cooling system
- Electronic-control common-rail system
- Electric system
- Air inlet, supercharger and mid-cooling system
Chapter V — Use and Maintenance of Aftertreatment System
- General requirements for the aftertreatment system
- Maintenance of aftertreatment system
- Technical parameters of main parts of the electronic control system (aftertreatment)
- Maintenance and installation of aftertreatment system
- Common faults and handling methods
Chapter VI — Fault Code of Electric Control System and Aftertreatment System (pages 107–128)
- Comprehensive fault code listing for ECU / electric control system
- Fault codes for aftertreatment system (DOC, DPF, SCR, ASC)
Chapter VII — Use of Diesel Engine
- Diesel fuel selection and specifications
- Engine oil selection
- Coolant, storage battery, power steering pump and air compressor
- Starting the diesel engine
- Running-in of diesel engine
- Operation of diesel engine
- Stopping the diesel engine
- Safety warnings
Chapter VIII — Maintenance of Diesel Engine
- First forced running-in maintenance
- Regular forced maintenance schedule
- Routine maintenance procedures
- Technical maintenance in winter
Chapter IX — Analysis and Troubleshooting for Common Faults (20 fault categories)
- Difficult starting
- Unstable low idling speed
- Unstable revolving speed
- Insufficient diesel engine power
- Limited revolving speed
- Shutdown of diesel engine
- Abnormal smoke exhaust
- Overheated diesel engine
- Abnormal noise during operation
- Excessive engine oil consumption
- Excessive fuel consumption
- Failure of lubrication system
- Failure of cooling system
- Aftertreatment system faults
- Starter failure
- Failure of charging generator
- Air compressor failure
- Fault diagnosis of turbocharger
- Failure of power steering pump
- Case study — maintenance of electronic-control high-pressure common-rail diesel engine
Chapter X — Fault Diagnosis
Chapter XI — Storage
✅ Who Needs This Manual?
- Diesel mechanics servicing YND20 / D20TCIF engines in pickup trucks and light commercial vehicles
- Technicians working with BOSCH common-rail injection systems (CRI1-20 injectors, CB4 pump, HFR-20 rail)
- Workshop engineers handling China VI aftertreatment systems (DOC, DPF, SCR, ASC regeneration and maintenance)
- Service stations requiring the complete ECU and aftertreatment fault code reference (Chapter VI)
- Fleet maintenance teams managing Yunnei-powered light commercial vehicles
🛒 Stop Guessing — Get the Exact Service Data You Need, Right Now
With 179 pages of factory technical data, complete assembly/disassembly sequences, BOSCH common-rail service procedures, and a full China VI fault code library, this is the definitive D20TCIF workshop reference — purchase now for an instant PDF download and have it open on your workbench in under a minute.