Description
Sisudiesel 320 420 620 634 Workshop Manual is the factory workshop publication for the 320, 420, 620 and 634 diesel engine families. It provides technical data and repair instructions for the listed three-, four- and six-cylinder engines, including the differences that affect individual engine types.
Produced by Sisu Diesel Inc., this 116-page manual is intended to support professional engine repair and workshop operations. It is useful for engine rebuilders, agricultural and industrial machinery technicians, fleet workshops and experienced mechanics responsible for inspection, dismantling, reconditioning, adjustment and assembly.
The publication includes safety information, engine identification, specifications, special tools, tightening torques, construction details and system-specific work instructions. Measurements are stated in millimetres and generally apply at a component temperature of +20°C unless the manual specifies otherwise.
ENGINE CONSTRUCTION AND TECHNICAL DATA
The introductory technical material establishes the specifications, construction and identification information required before repair work begins. Subjects include:
- Engine type designations and application codes
- Engine specifications and serial number location
- Safe engine lifting information
- Workshop safety instructions
- Special workshop tools and order numbers
- Technical data and tightening torques
- Cylinder block, liners and cylinder head
- Crankshaft, camshaft and timing gears
- Connecting rods, pistons and piston rings
- Flywheel, housing and balancing unit
CYLINDER BLOCK AND CYLINDER HEAD
Detailed work instructions cover inspection and repair of the principal engine structure and valve gear. Procedures listed in the manual include:
- Measuring cylinder liner wear
- Removing and fitting cylinder liners
- Checking the cylinder block
- Changing camshaft bushes
- Fitting the flywheel housing
- Changing the rear crankshaft oil seal
- Removing, checking and fitting the cylinder head
- Changing valve guides and valve seat rings
- Machining valve seats and grinding valves
- Reconditioning and adjusting the valve mechanism
CRANKSHAFT, PISTONS AND TIMING ASSEMBLY
The manual provides workshop procedures for major internal engine components, supporting systematic dismantling, checking and reassembly.
- Crankshaft removal, inspection and installation
- Crankshaft gears, pulley and vibration damper
- Connecting rod bearing replacement
- Connecting rod and piston inspection
- Piston ring and piston pin work
- Counterbalance unit repair for applicable 420 engines
- Flywheel starter ring gear replacement
- Timing gear casing removal and installation
- Idler gear reconditioning
- Power take-off within the timing gear assembly
LUBRICATION, COOLING AND AIR SYSTEMS
Engine-supporting systems are covered with model-specific distinctions where required for the 320, 420, 620 and 634 families.
- Lubricating oil pressure relief valve
- Oil pump removal, dismantling and installation
- Oil sump gasket and lubricating oil cooler
- Piston cooling nozzles on 620 and 634 engines
- Lubricating oil quality requirements
- Thermostat inspection
- Coolant pump reconditioning
- Heavy-duty coolant pump bearings
- Coolant quality requirements
- Air cleaner, inlet pipes, exhaust pipes and turbocharger checks
FUEL INJECTION SYSTEM
Fuel-system information covers the injection equipment represented in this engine range, including in-line, CAV distributor and Stanadyne distributor pumps.
- Fuel-system and Thermostart bleeding
- Fuel feed-pressure measurement
- Overflow valve and feed-pump checks
- Injection timing checks and adjustment
- Injection pump removal and installation
- Pressure valve inspection and replacement
- Injector removal, inspection and reconditioning
- Delivery pipe installation
- Low idle-speed adjustment
- Fuel quality requirements
ELECTRICAL AND OPTIONAL EQUIPMENT
Engine electrical equipment and selected optional installations are also addressed.
- Alternators
- Starter motors
- Electric stop device
- Magnetic pick-up installation
- Temperature sensor
- Electronic Engine Management system construction
- Electrical advance wiring for applicable Stanadyne equipment
- Bendix and Knorr compressors
- A.P. Borg & Beck industrial clutch
SISUDIESEL 320 420 620 634 WORKSHOP MANUAL COVERAGE
Engine families: 320, 420, 620 and 634.
Engine types listed: 320D, 320DS, 420D, 420DS, 420DW, 420DWI, 620D, 620DS and 634DS.
The manual explains that these engines are largely similar in construction, while technical data and repair instructions identify differences that affect particular types. Applicability should therefore be checked against the engine type and serial number before work begins.
MANUAL DETAILS
- Manufacturer: Sisu Diesel Inc.
- Manual type: Workshop Manual
- Publication number: 8366 40634
- Edition marking: 02 02
- Page count: 116 pages
- Language: English
This Sisudiesel 320 420 620 634 Workshop Manual is an engine repair publication rather than an operator’s handbook. The manual specifically notes that routine service procedures are handled separately in the 20/34-series Operator’s Manual.
It is a practical workshop reference for correctly identifying components, checking dimensions, following tightening requirements and carrying out the documented repair and adjustment procedures on the covered Sisudiesel engines.
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