Onan McGraw-Edison L317, L423, L634, L634T L Series Diesel Engines Service Manual 40545100 English

Brands: Onan / McGraw-Edison / Sperry New Holland / New Holland Agriculture

Equipment Type: Diesel Engine

Manuals Type: Service Manual

Machine Model & Serial Number: L317, L423, L634, L634T L Series (Diesel Engine as used in Sperry New Holland Equipment)

Region: N/R

Book Code: 40545100

Issued: February 1984

Language: English

Pages: 180

File Format: Portable Document Format (PDF)

Remark: Massive 180-page ultimate diesel engine service manual. High Value: Contains exhaustive internal overhaul procedures for naturally aspirated and turbocharged L-series engines. Features precise specifications for the Roosa Master DB2 fuel injection pump, including static timing for pre-1983 and post-1983 models. Covers complete reconstruction of cylinder heads (with hot plugs), dry cylinder liners, and deep-level turbocharger diagnostics for Holset and Airesearch units. Specifically designed for engines used in Sperry New Holland industrial, marine, and automotive equipment.

Table of contents

• 1. SPECIFICATIONS
  • Industrial, Marine, and Automotive Engine Data
  • Static Pump Timing Specifications (7-digit vs 9-digit pumps)
• 2. DIMENSIONS AND CLEARANCES
  • Cylinder Block, Crankshaft, and Connecting Rod Wear Limits
  • Camshaft and Piston Ring Clearances
  • Intake and Exhaust Valve Seat and Guide Data
• 3. TORQUES
  • Engine Assembly Torque Specifications (Nm and Ft-Lb)
  • Roosa Master Injection Pump Critical Torque Values
• 4. SPECIAL TOOLS
  • Diesel Nozzle Testers and Pump Tools
  • Cylinder Leakage Testers and Bearing Pullers
• 5. TROUBLESHOOTING
  • Engine Performance and Cylinder Leak Down Tests
  • Turbocharger, Electrical, and Fuel System Fault Isolation
• 6. START-UP AND OPERATION
  • Crankcase Oil and Fuel Recommendations
  • Fuel System Priming (Transfer Pump and High Pressure)
  • Glow Plug Preheating and Cold Start Procedures
• 7. MAINTENANCE
  • Periodic Schedules and Engine Inspection
  • Fuel Injection Pump and Aneroid Adjustments
• 8. OIL SYSTEM
  • Oil Pump Overhaul (3, 4, and 6 Cylinder Variants)
  • Oil Cooler Pressure Relief and Regulating Valve Servicing
  • Oil Spray Nozzles (Turbocharged Models)
• 9. COOLING SYSTEM
  • Thermostat Testing and Replacement
  • Marine Heat Exchanger and Sea Water Pump Service
  • Radiator and Fan Belt Adjustments
• 10. FUEL SYSTEM
  • Roosa Master DB2 Component Functions and Fuel Flow
  • Injection Pump Timing Window and Marks Alignment
  • Fuel Transfer Pump and Throttling Pintle Nozzles Overhaul
  • Aneroid (Acceleration Smoke Control) Operation
• 11. EXHAUST SYSTEM
  • Dry and Water Cooled Exhaust Manifold Procedures
• 12. ELECTRICAL SYSTEM
  • Mitsubishi Starter and Motorola Alternator Overhaul
  • Electronic Control Unit (ECU) Wiring Diagrams
  • Speed Sensor (Tachometer) Adjustment
• 13. ENGINE DISASSEMBLY AND REBUILDING
  • Suggested Rebuilding Order and Break-in Procedure
  • Cylinder Head Refacing and Hot Plug Installation
  • Valve Face and Seat Grinding (Interference Angle Method)
  • Connecting Rod Bushing Replacement
  • Cylinder Block Reboring, Honing, and Deglazing
  • Crankshaft Rear/Front Oil Seal and Wear Sleeve Installation
• 14. TURBOCHARGER
  • Holset and Airesearch Inspection
  • Bearing Radial and Axial Play Verification

Foreword
This manual is designed to assist all service personnel with the maintenance and overhaul of Onan L series diesel engines. It presents a description of each system's function together with instructions on servicing and overhaul procedures. These engines have a counterclockwise rotation when viewed from the rear, flywheel end. The manner in which the engine is operated and maintained will determine its performance, safety, and durability. Use only genuine Onan parts and specified special tools during reassembly to ensure quality results.