Overview
The AGCO Sisu 645 Engines Workshop Repair Service Manual provides technical information for inspecting, servicing and repairing AGCO Sisu 645 diesel engines. This 76-page English-language manual covers the liquid-cooled, six-cylinder, four-stroke inline diesel engine with direct fuel injection. The documentation includes engine specifications, construction details, technical measurements, tightening torques, special tools and workshop repair instructions for major engine components.
The AGCO Sisu 645 engine features wet, replaceable cylinder liners supported at their midpoints, oil-cooled pistons, two separate cylinder heads and a rigid, ribbed cylinder block. Workshop coverage includes the cylinder block, flywheel housing, cylinder heads, valve mechanism, crankshaft, connecting rods, pistons, flywheel, timing gears, tensioning device, lubrication and cooling systems, inlet and exhaust components, fuel system, fuel system test equipment and electrical system.
Safety: Read the safety instructions before beginning engine repair work. Ensure that the required tools, replacement parts and accessories are available. Follow the applicable workshop procedures and specified tightening torques.
Notice: The workshop manual states that engines in the covered family share many construction features, although differences affecting repair work are identified in the technical data and instructions. Measurements are specified in millimetres at a component temperature of +20°C unless otherwise stated.
Table of Contents
AGCO Sisu 645 Manual
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01. General Information and Technical Specifications
- To the User
- Safety Instructions
- Special Workshop Tools
- Engine Specifications
- Technical Data
- Engine Component Tightening Torques
- Engine Construction
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02. Workshop Repair Instructions
- 01. Cylinder Block
- 02. Flywheel Housing
- 03. Cylinder Head
- 04. Valve Mechanism
- 05. Crankshaft
- 06. Connecting Rods and Pistons
- 07. Flywheel
- 08. Timing Gear Assembly
- 09. Tensioning Device
- 10. Lubrication System
- 11. Cooling System
- 12. Inlet and Exhaust System
- 13. Fuel System
- 14. Fuel System Test Equipment
- 15. Electrical System
Engine Construction and Post-Repair Running-In
The AGCO Sisu 645 engine uses wet cylinder liners supported in the middle of the cylinder block and two separate cylinder heads. The mid-supported liners, oil-cooled pistons and reinforced crank mechanism are important construction characteristics to consider when consulting the cylinder block, cylinder head, piston and crankshaft repair sections. The cylinder head bolts are identified as high-tensile fasteners, making the manual’s tightening specifications particularly relevant during reassembly.
The workshop instructions include separate fuel system and fuel system test equipment sections, along with special tool references and general technical data. The publication also specifies that an engine which has undergone repairs must be run in as a new engine would be. Follow the applicable engine instructions and specifications when returning a repaired engine to service.
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