Troubleshooting Engine Noise in the 2017 Sullair 185 Air Compressor

[MikePhua]

The Sullair 185 air compressor is a robust and reliable piece of equipment widely used in construction, mining, and industrial settings. Known for its portability and high performance, it is often relied upon for powering pneumatic tools, running drills, and performing various heavy-duty tasks. However, like any mechanical equipment, the Sullair 185 is not immune to issues, and one problem that can be particularly concerning is unusual engine noise.
When an engine starts making strange noises, it’s critical to identify the cause promptly to avoid further damage. In this article, we will delve into the potential causes of engine noise in the 2017 Sullair 185, how to diagnose the problem, and the steps you can take to fix it. We’ll also highlight some real-world examples and provide useful tips for maintaining your air compressor.
Understanding the Sullair 185 Air Compressor Engine
The Sullair 185 features a diesel engine, typically from Kubota, Yanmar, or other leading engine manufacturers. These engines are designed for reliability and efficiency, providing the necessary power for continuous operation in demanding environments.
The engine powers the air compressor, which then supplies high-pressure air to power tools and machinery. The engine is fitted with key components such as pistons, valves, fuel injectors, and air filters. All these components work in unison to ensure the smooth operation of the engine, and any malfunction in one part can lead to noticeable issues, including unwanted engine noises.
Common Causes of Engine Noise in the Sullair 185
Several factors can contribute to abnormal engine noise in the Sullair 185. Below are some of the most common causes:

1. Low Oil Levels or Contaminated Oil
   One of the primary reasons for engine noise in any machinery, including the Sullair 185, is insufficient lubrication. Low oil levels or contaminated oil can cause internal engine parts to rub together, leading to friction, heat, and unwanted noise.
   Symptoms:
   • Tapping, knocking, or grinding sounds from the engine.
     
   • Decreased performance or erratic operation.
     
   Solution: Always check the oil level regularly and ensure that it is at the manufacturer’s recommended level. If the oil looks dirty or has a burnt smell, change it immediately. Regular oil changes will also help in maintaining the engine's performance.
   
2. Damaged or Worn Engine Components
   Over time, components such as pistons, valves, and bearings can wear out due to continuous operation, causing unusual engine sounds. A worn valve lifter or rod bearing, for example, can produce a tapping or knocking noise.
   Symptoms:
   • A deep knocking sound coming from the engine.
     
   • Decreased power output or misfires.
     
   Solution: If worn engine components are suspected, it’s best to have the engine inspected by a professional mechanic. Replacing worn-out parts like bearings or pistons may be necessary to restore proper function and quiet operation.
   
3. Fuel Injector Issues
   Fuel injectors play a critical role in delivering the right amount of fuel to the engine's combustion chamber. If the fuel injectors are clogged, dirty, or malfunctioning, they may cause an uneven fuel distribution, resulting in engine misfires and unusual noises such as knocking or rattling.
   Symptoms:
   • A loud knocking or popping noise, especially when the engine is idling.
     
   • Poor fuel efficiency or engine hesitation.
     
   Solution: Cleaning or replacing the fuel injectors can often resolve these types of issues. Using high-quality fuel and performing regular maintenance on the fuel system will help prevent clogging or malfunctioning injectors.
   
4. Air Intake Blockages
   The air intake system is responsible for supplying the engine with the necessary amount of air for combustion. If the air filter becomes clogged with dust or debris, it can restrict airflow, causing the engine to work harder and produce more noise.
   Symptoms:
   • Increased engine noise and reduced power.
     
   • Visible dirt or debris around the air intake area.
     
   Solution: Check and clean the air filter regularly, and replace it if necessary. Ensuring proper airflow will improve engine efficiency and reduce unwanted sounds.
   
5. Exhaust System Issues
   The exhaust system in the Sullair 185 not only directs emissions away from the engine but also helps reduce engine noise. If the exhaust pipe, muffler, or catalytic converter becomes damaged or clogged, it can result in a louder engine sound, especially at higher RPMs.
   Symptoms:
   • Louder-than-usual engine noise, particularly under load.
     
   • Smoke or fumes escaping from the exhaust system.
     
   Solution: Inspect the exhaust system for visible damage or blockages. If any part of the system is compromised, it should be repaired or replaced to restore optimal performance and reduce noise.
   

Diagnosing Engine Noise: A Step-by-Step Approach
When faced with unusual engine noise, it’s essential to perform a methodical diagnosis. Here’s a simple step-by-step approach:

1. Listen Carefully: Pay attention to the type of noise the engine is making. Is it a tapping, knocking, whining, or hissing sound? Different noises can point to different issues.
   
2. Check Oil Levels: Start by checking the oil level and condition. If the oil is low or contaminated, change it immediately.
   
3. Inspect the Fuel System: Check the fuel injectors for any signs of clogging or wear. Ensure that the fuel filter is clean and the fuel system is functioning properly.
   
4. Examine the Air Intake: Inspect the air filter and intake system for blockages or dirt buildup.
   
5. Check the Exhaust System: Look for any visible signs of damage, rust, or leaks in the exhaust system.
   
6. Listen Under Load: If possible, operate the compressor under load to determine if the noise changes. This can help pinpoint whether the issue is related to engine components, fuel delivery, or exhaust.
   

Real-World Example: Troubleshooting a 2017 Sullair 185 Compressor
A contractor working on a construction site in Colorado noticed that his 2017 Sullair 185 compressor was producing an unusual knocking sound. The compressor had been running fine for several months, but the operator became concerned when the engine noise intensified, particularly when the unit was under load.
After listening to the engine carefully and conducting a basic inspection, the contractor checked the oil and found that it was low and slightly contaminated. He topped up the oil, but the noise persisted. Upon closer inspection, he discovered that the fuel injectors were clogged. After cleaning the injectors, the engine noise diminished significantly, and the compressor returned to its normal, quiet operation.
This story highlights the importance of regular maintenance and addressing small issues before they develop into bigger problems.
Preventative Maintenance Tips to Avoid Engine Noise Issues
Regular maintenance is key to preventing engine noise issues in the Sullair 185. Here are some essential tips to keep your air compressor running smoothly:

1. Regular Oil Changes: Change the oil at the manufacturer-recommended intervals, and always use high-quality oil. Regular oil changes reduce the risk of internal engine damage and keep things running quietly.
   
2. Inspect the Fuel System: Clean or replace the fuel injectors regularly, and use high-quality fuel to prevent clogging. A well-maintained fuel system ensures smooth operation and prevents knocking.
   
3. Maintain the Air Intake System: Clean or replace the air filter as needed, especially in dusty environments. A clean air filter allows the engine to breathe freely and run more efficiently.
   
4. Check the Exhaust System: Inspect the exhaust system for leaks or damage, as this can contribute to engine noise. A properly functioning exhaust system also helps reduce harmful emissions.
   
5. Listen for Early Warning Signs: Pay attention to any changes in engine noise. If you hear a new sound, address it early to prevent further damage.
   

Conclusion: Keeping Your Sullair 185 in Top Condition
Engine noise in the Sullair 185 air compressor is often a sign of an underlying issue, whether it’s low oil, fuel system problems, or a clogged air intake. By regularly checking key components such as the oil, fuel injectors, and exhaust system, you can maintain the performance of your compressor and avoid costly repairs.
A proactive approach to maintenance will ensure that your air compressor remains a reliable and quiet workhorse on the job site, providing consistent power to your tools and machinery. If you encounter engine noise, take the time to diagnose the issue properly and resolve it early to extend the life of your equipment.