Subaru EH722 EFI Parts Manual

Pages 28

Year 2010

Language(s)

of 28

Subaru EH722 EFI Engine Specification

The Subaru EH722 EFI engine is a robust and advanced power unit designed for a variety of industrial and commercial applications. It features a horizontally-opposed, air-cooled, 4-cycle, V-twin configuration, which ensures optimal balance and minimal vibration during operation. The engine has a displacement of 720cc, enabling it to deliver substantial power output while maintaining efficiency. Equipped with an Electronic Fuel Injection (EFI) system, the EH722 optimizes fuel delivery, resulting in improved fuel efficiency, reduced emissions, and reliable startup under varying environmental conditions.

This engine is engineered with a bore and stroke of 92mm by 66mm, which contributes to its ability to produce consistent and smooth power. It is capable of delivering a maximum horsepower of approximately 25.5 HP at 3600 RPM, making it suitable for demanding applications that require high power. The compression ratio is set at 8.5:1, balancing the need for power and fuel efficiency.

The EH722 features an overhead valve (OHV) design, enhancing its performance by allowing for better airflow and more efficient combustion. The engine's lubrication system is designed with a full-pressure system, including a spin-on oil filter, which ensures longevity and reliability by minimizing wear and tear on moving parts. Additionally, the engine includes a large-capacity air cleaner, which provides superior protection against dust and debris, thereby extending the engine’s life.

In terms of design, the Subaru EH722 EFI engine is compact and lightweight, making it easy to integrate into various machinery and equipment. The engine's construction emphasizes durability, utilizing high-quality materials and precision engineering to withstand rigorous operational demands.

Subaru EH722 EFI Engine F.A.Q.

What type of oil should be used for the Subaru EH722 EFI engine?

Use a high-quality SAE 10W-30 engine oil for optimal performance. Ensure the oil meets or exceeds API service category SJ or later.

How do I troubleshoot if the engine does not start?

First, check the fuel level and ensure the fuel is not contaminated. Verify the battery charge and connections. Inspect the spark plug for fouling or damage. Ensure the EFI system is functioning properly by checking connectors and sensors.

What is the recommended maintenance schedule for the Subaru EH722 EFI engine?

Perform an oil change every 100 operating hours or annually, whichever comes first. Replace the air filter every 200 hours. Inspect and clean the fuel system every 300 hours. Regularly check the spark plug and replace it every 300 hours or as needed.

How can I improve the fuel efficiency of the EH722 EFI engine?

Ensure regular maintenance, including cleaning or replacing the air filter and spark plug. Use the recommended grade of oil and fuel. Avoid overloading the engine and allow it to warm up before use.

What should I do if the engine overheats?

Stop the engine immediately and let it cool down. Check the cooling fins and clean any debris. Ensure the oil level is adequate. Inspect for any leaks in the cooling system and repair as necessary.

How do I adjust the idle speed on the Subaru EH722 EFI engine?

To adjust the idle speed, locate the idle speed adjustment screw on the carburetor. Turn the screw clockwise to increase the idle speed or counterclockwise to decrease it. Refer to the engine's manual for the recommended idle speed settings.

What are common causes of rough idling in the EH722 EFI engine?

Rough idling can be caused by a dirty air filter, fouled spark plug, or issues with the fuel injection system. Check for vacuum leaks and ensure the fuel is clean and not stale.

How can I reset the EFI system on the Subaru EH722?

Disconnect the negative terminal of the battery for a few minutes to reset the EFI system. Reconnect the terminal and start the engine to see if the issue is resolved.

What should I inspect during a routine engine check-up?

Inspect the oil level and quality, air filter condition, spark plug, and fuel system. Check for any signs of leaks or wear in belts and hoses. Ensure all electrical connections are secure.

How do I winterize the Subaru EH722 EFI engine?

Drain the fuel or add a fuel stabilizer. Change the oil and replace the oil filter. Remove the spark plug and add a few drops of oil into the cylinder, then turn the engine over by hand to distribute the oil. Store the engine in a dry, cool place.