Wisconsin VG4D2 Engine: Specifications and Applications

[MikePhua]

The Wisconsin VG4D2 engine, a popular four-cylinder gasoline engine, is known for its robust performance in a variety of industrial and agricultural applications. This engine has been used in numerous types of heavy equipment and machinery over the years, proving its reliability and durability. In this detailed guide, we’ll break down the specifications of the VG4D2 engine, explore its uses, and provide insights into its maintenance and troubleshooting.
Introduction to the Wisconsin VG4D2 Engine
The Wisconsin VG4D2 is part of the VG series of engines produced by the Wisconsin Motor Manufacturing Company. These engines were designed for various industrial applications, including agricultural equipment, small generators, and other machinery. Despite being a relatively older model, the VG4D2 is still utilized in several applications due to its simple design, ease of maintenance, and proven performance.
Manufactured in the mid-20th century, the VG4D2 engine became well-known for its adaptability and reliability. It was frequently employed in environments that required consistent performance, such as pumping stations, generators, and smaller construction equipment.
Specifications of the Wisconsin VG4D2 Engine
The VG4D2 engine is a four-cylinder, in-line gasoline engine with a cast-iron construction. Below are the key specifications that define this engine:

1. Engine Type: Four-cylinder, inline, spark-ignition
   
2. Displacement: 4.2 liters (255 cubic inches)
   
3. Bore x Stroke: 3.5 inches x 4.0 inches (89 mm x 102 mm)
   
4. Compression Ratio: 6.5:1
   
5. Maximum Horsepower: 60 horsepower @ 2,400 RPM
   
6. Maximum Torque: 120 lb-ft @ 1,500 RPM
   
7. Cooling System: Water-cooled
   
8. Fuel Type: Gasoline
   
9. Fuel System: Carbureted, with a simple single-barrel carburetor
   
10. Lubrication System: Splash lubrication with an oil pump and oil filter
    
11. Ignition System: Coil-type, with contact points
    
12. Oil Capacity: Approximately 4.5 quarts (4.3 liters)
    
13. Cooling Capacity: 6.5 quarts (6.2 liters)
    
14. Starter Type: 12-volt electric starter
    
15. Dimensions: Length: 26 inches, Width: 22 inches, Height: 28 inches
    
16. Weight: Approximately 350 pounds (159 kg)
    

These specifications reveal that the VG4D2 is a medium-powered engine, capable of producing significant torque at lower RPMs, which is typical for engines used in industrial applications. It’s designed for easy maintenance and offers a relatively low-cost option for power generation and equipment operation.
Applications of the Wisconsin VG4D2 Engine
The VG4D2 engine was widely used in various industrial and agricultural machines, thanks to its dependable performance and simplicity. Below are some of the common applications where this engine has been used:

1. Agricultural Equipment:
   The VG4D2 engine was often found in tractors, plows, and other farm machinery. Its ability to generate moderate power while maintaining fuel efficiency made it ideal for agricultural tasks that required reliable performance over long hours.
   
2. Generators and Pumps:
   Small to medium-sized generators and water pumps frequently relied on the VG4D2 engine. Its ruggedness and ability to run for extended periods made it a popular choice for both stationary and mobile power generation in various sectors, including construction and utilities.
   
3. Light Construction Equipment:
   Many older models of construction equipment, such as concrete mixers, small loaders, and skid steers, were equipped with the VG4D2 engine. Its power output was well-suited for lighter tasks, though it could struggle with more intensive jobs.
   
4. Small Industrial Machinery:
   In industrial settings, the VG4D2 was often used in compressors, small cranes, and other machinery requiring moderate power. Its relatively compact size and reasonable power-to-weight ratio made it versatile for various applications in workshops and factories.
   
5. Vehicles and Transportation:
   The engine also found its place in some vintage military vehicles, trucks, and even small boats, thanks to its durable construction and consistent output.
   

Maintenance and Troubleshooting Tips for the Wisconsin VG4D2
Although the VG4D2 engine is well-regarded for its simplicity and durability, like any engine, it requires proper maintenance to ensure longevity and optimal performance. Below are some key maintenance tips and common troubleshooting issues for operators of the VG4D2 engine.
1. Regular Oil Changes
The VG4D2 engine relies on splash lubrication, so keeping the oil clean and at the correct level is crucial for its smooth operation. Over time, engine oil can become contaminated with debris, leading to poor lubrication and accelerated wear. It’s important to replace the engine oil and filter every 100-150 hours of operation or as specified by the manufacturer.
2. Carburetor Maintenance
The VG4D2 uses a carbureted fuel system. Over time, carburetors can become clogged with dirt or gum from stale fuel. Regular cleaning and inspection of the carburetor can prevent performance issues such as hard starting or stalling. If the engine is idling roughly or not maintaining a steady speed, the carburetor may need to be cleaned or rebuilt.
3. Cooling System Care
Since the VG4D2 is a water-cooled engine, it’s important to regularly check the coolant levels and ensure there are no leaks in the system. Old or contaminated coolant can impair the engine’s ability to maintain proper temperature, leading to overheating. Ensure that the radiator and hoses are in good condition and free from blockages.
4. Spark Plug Replacement
The VG4D2 engine uses coil-type ignition with contact points. Over time, spark plugs can wear out and cause misfires, poor fuel efficiency, and starting difficulties. It’s a good idea to inspect and clean the spark plugs regularly, and replace them if they show signs of wear, such as excessive carbon buildup.
5. Troubleshooting Low Power or Stalling
If the engine is experiencing low power, stalling, or difficulty starting, it could be due to several issues:

• Clogged air filter: A dirty air filter can restrict airflow to the engine, leading to poor combustion. Clean or replace the air filter as necessary.
  
• Fuel delivery issues: If the fuel lines or fuel filter are clogged, the engine may not receive the necessary fuel supply. Ensure that the fuel system is clean and functioning properly.
  
• Weak battery or charging issues: The VG4D2 relies on a 12-volt electric starter. If the battery is weak or the alternator is malfunctioning, it may prevent the engine from starting properly. Check the battery’s charge and inspect the alternator for proper output.
  

6. Engine Overheating
If the engine is overheating, check the coolant level and ensure the radiator is clear of debris. Also, inspect the water pump and thermostat to make sure they are functioning correctly.
Conclusion
The Wisconsin VG4D2 engine is a reliable and durable power unit that continues to serve in various industrial and agricultural applications. While it may be an older model, its proven performance and ease of maintenance make it a valuable asset for operators who are willing to put in the necessary care and attention.
By understanding the key specifications, common issues, and maintenance tips, you can ensure that your Wisconsin VG4D2 engine runs smoothly for years to come. Whether you are using it for a generator, farm machinery, or light construction equipment, the VG4D2 remains a dependable option for many users in need of an efficient and straightforward engine.