### **SISU Diesel 320 420 620 634 Engine: A Comprehensive Overview**

#### **Introduction**

The SISU Diesel 320 420 620 634 engine is a robust and reliable powerplant designed for demanding applications. This high-performance engine delivers exceptional power and torque while maintaining fuel efficiency and minimizing emissions. Its advanced design and construction make it a versatile choice for various heavy-duty vehicles and industrial equipment.

#### **Engine Architecture**

The SISU Diesel 320 420 620 634 engine features an in-line, 6-cylinder configuration with a displacement of 9 liters. Its compact design and optimized weight distribution contribute to its overall efficiency. The cylinder block is constructed from high-strength cast iron, ensuring durability and longevity.

#### **Fuel System and Emissions Control**

The engine employs a high-pressure common rail fuel injection system, delivering precise fuel delivery and optimizing combustion efficiency. This advanced system reduces emissions by minimizing particulate matter and nitrogen oxides (NOx). The engine also incorporates a diesel oxidation catalyst (DOC) and selective catalytic reduction (SCR) system to further reduce emissions and meet stringent environmental regulations.

#### **Turbocharging and Intercooling System**

The SISU Diesel engine utilizes a turbocharger to enhance power and torque output. The turbocharger is designed to provide optimal boost pressure under varying load conditions, resulting in increased engine performance and fuel economy. An intercooler located between the turbocharger and intake manifold effectively reduces charge air temperature, improving combustion efficiency and reducing emissions.

#### **Cooling and Lubrication Systems**

The engine's cooling system features a closed-circuit, pressurized design with a radiator, coolant pump, and thermostat. This system ensures optimal temperature control under extreme operating conditions. The lubrication system incorporates a full-flow oil filter and a gear-driven oil pump, providing continuous oil circulation and protection against wear and tear.

#### **Electrical System**

The electrical system powers essential engine components, including the starter motor, alternator, and ignition system. The starter motor is designed to provide reliable engine starting under various conditions. The alternator generates electrical power to charge the battery and supply auxiliary systems.

#### **Electronic Control System**

The SISU Diesel engine is equipped with an advanced electronic control system. This system monitors and adjusts engine parameters, such as fuel injection timing, boost pressure, and emissions control, in real-time. The electronic control system enhances engine performance, fuel efficiency, and emissions reductions.

#### **Durability and Reliability**

The SISU Diesel 320 420 620 634 engine is engineered to withstand demanding operating conditions. Its robust construction and high-quality components ensure extended service life and minimal downtime. The engine incorporates a durable crankshaft, forged connecting rods, and wear-resistant cylinder liners, contributing to its overall longevity.

#### **Applications**

The SISU Diesel 320 420 620 634 engine finds extensive applications in a wide range of heavy-duty vehicles and industrial equipment, including:

- On-highway trucks
- Off-highway construction equipment
- Mining equipment
- Forestry equipment
- Marine vessels
- Stationary power generation

SISU Diesel 320 420 620 634 Engine Complete Workshop Service Repair Manual

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