Engine Swap for 1985 Komatsu WA350-1 Loader: Compatible Engine Options

[MikePhua]

The Komatsu WA350-1 is a reliable wheel loader known for its robust performance and durability. However, over time, engines can wear out or become inefficient, leading to the need for a replacement. One common question among Komatsu WA350-1 owners is what type of engines will bolt up to this machine if an engine swap is needed. This article explores various engine options that are compatible with the 1985 WA350-1 loader and provides guidance on what to consider during the engine replacement process.
Understanding the Komatsu WA350-1 Loader’s Engine
Before diving into potential engine options, it’s important to understand the original engine specifications and setup of the WA350-1 loader.

• Original Engine: The 1985 Komatsu WA350-1 typically comes equipped with a Komatsu S6D125-E engine. This engine is a six-cylinder, turbocharged, direct-injection diesel engine.
  
• Engine Features: It delivers a reasonable balance of power and efficiency for most loader operations. As the machine is relatively old, its engine may need replacement due to factors such as high mileage, wear and tear, or inefficiency.
  

Common Engine Swap Considerations
When considering an engine swap for the Komatsu WA350-1, there are several key factors that need to be taken into account:

1. Engine Mount Compatibility:
   • The replacement engine must have compatible engine mounts and bolt holes to ensure a proper fit into the machine’s frame. If the new engine doesn’t align correctly, modifications will be necessary.
     
2. Power Output and Torque:
   • The replacement engine should provide a similar or slightly higher power output to maintain the loader’s performance and ensure that it can handle the expected loads. The engine’s torque characteristics should also align with the operational needs of the WA350-1.
     
3. Cooling and Exhaust System:
   • Ensure that the cooling system and exhaust ports of the replacement engine are compatible with the WA350-1’s design. Proper cooling is essential to prevent overheating, and exhaust systems need to meet emission regulations while working efficiently.
     
4. Transmission Compatibility:
   • The new engine must be compatible with the loader’s transmission system, including the flywheel, clutch, and bell housing. Make sure the new engine aligns with these components to avoid additional changes.
     
5. Electrical and Fuel System:
   • Wiring harnesses, fuel lines, and electrical connections should match between the original and replacement engine. Some modification might be required, especially if the new engine has a different fuel injection system or electrical setup.
     

Compatible Engine Options for the Komatsu WA350-1
When considering an engine swap, it is essential to choose a replacement that not only fits but also provides reliable performance. Below are some potential engine options that can be swapped into the 1985 Komatsu WA350-1 loader.

1. Komatsu S6D125-E Engine:
   • Why Choose It: The easiest and most straightforward engine swap option would be to replace the original engine with another Komatsu S6D125-E engine, or a compatible variant from the same engine family.
     
   • Advantages: This engine is designed for the WA350-1, so there are no compatibility issues regarding mounting, power, or cooling systems. It provides a reliable replacement with minimal modifications required.
     
   • Considerations: Finding a used or rebuilt Komatsu S6D125-E may take time, but it ensures a direct fit.
     
2. Cummins NTA885:
   • Why Choose It: The Cummins NTA885 is a commonly used engine in heavy equipment and has been used as a replacement in various Komatsu machines.
     
   • Advantages: This engine is known for its reliability and performance in tough conditions. It offers similar horsepower and torque, making it a good match for the WA350-1.
     
   • Considerations: While the Cummins NTA885 is a popular choice, some modifications may be necessary for engine mounting, exhaust routing, and electrical connections.
     
3. Perkins 6.354.4:
   • Why Choose It: The Perkins 6.354.4 engine is another viable option, commonly found in construction machinery and known for its fuel efficiency and ease of maintenance.
     
   • Advantages: The Perkins engine offers a similar power rating to the original Komatsu engine and is compatible with most hydraulic systems in loaders.
     
   • Considerations: Adapting the Perkins engine to the WA350-1 might require some adjustments to the engine mounts and cooling system. Additionally, the exhaust system may need modifications to fit properly.
     
4. Mitsubishi S6K:
   • Why Choose It: Mitsubishi engines are commonly used in various Komatsu machines. The S6K is a turbocharged diesel engine that offers solid power output.
     
   • Advantages: The Mitsubishi S6K is similar in performance to the original Komatsu engine and can be a direct replacement with minimal modification.
     
   • Considerations: Similar to other swaps, the main concern will be fitting the engine mounts and ensuring compatibility with the existing cooling system and transmission.
     

Steps for Completing the Engine Swap
Once you’ve chosen the replacement engine, the following steps should be followed to complete the engine swap:

1. Remove the Old Engine:
   • Disconnect all fuel lines, electrical connections, hydraulic connections, and exhaust components.
     
   • Use a crane or lifting equipment to carefully remove the old engine from the loader.
     
2. Prepare the New Engine:
   • Ensure the replacement engine is ready to be installed, including fitting the correct flywheel, clutch, and transmission components.
     
   • Check and verify that the new engine's mounting holes and dimensions align with the loader’s frame.
     
3. Install the New Engine:
   • Carefully position the new engine in place, making sure it aligns with the mounting brackets and transmission.
     
   • Secure the engine to the loader frame and tighten all bolts according to the manufacturer’s specifications.
     
4. Reconnect the Components:
   • Reconnect all fuel lines, hydraulic connections, electrical wiring, and exhaust systems. Make sure that all seals are tight and leak-free.
     
   • If necessary, modify or replace components such as fuel filters, sensors, or wiring to match the new engine.
     
5. Test the Engine:
   • Once the engine is installed, test it to ensure that it runs smoothly. Check for leaks, verify that all systems are functioning correctly, and ensure that there are no strange noises or vibrations.
     
   • Perform a full functionality test on the loader to ensure the replacement engine operates as expected under load.
     

Conclusion
Replacing the engine in a 1985 Komatsu WA350-1 loader is an important task that requires careful consideration of engine compatibility, mounting, and system integration. While there are several potential replacement engines, options like the Komatsu S6D125-E, Cummins NTA885, Perkins 6.354.4, and Mitsubishi S6K are commonly used and offer reliable performance. Ensuring that the replacement engine matches the loader’s power, cooling, and transmission requirements is essential for a smooth and efficient swap. Proper installation and testing will ensure the WA350-1 continues to operate at its best for years to come.