If you are perusing this information, you likely possess some knowledge regarding diesel brake air compressors. We shall forego discussing the basic concepts, as your expertise is evident.
The focal points of the compressor lie within two primary components:
- The Engine Block
- The Cylinder Head
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The diesel engine block is responsible for housing the crankshaft and piston, while the cylinder head accommodates the valves and unloader. Should you encounter any challenges with the compressor, we recommend exploring straightforward solutions to address common issues.
Common Issues with Diesel Air Brake Compressors
1. Drive Failure:
One of the most common issues with diesel air brake compressors is drive failure. When the compressor drive fails, it can result in the compressor not producing any air at all. In rare cases, the drive may catch intermittently. If the piston rings or cylinder wall are worn out, the compressor may either not pump at all or pump slowly. A simple way to test both the drive and rings simultaneously is by disconnecting the discharge line and using a compression tester with a rubber tip inserted into the outlet fitting. It is crucial not to thread a tester onto the discharge line to avoid causing extreme pressure and damage. If the compressor can build at least 120psi, it indicates that the drive and rings are functioning correctly.
2. Failure to Reach 120psi:
Another common issue is when the air compressor fails to build up to at least 120psi. In such cases, one can start by removing the air governor and testing the compressor again. If the compressor builds air with the governor removed, it is important to check if the air dryer is not sending a signal to the governor to unload the compressor. If there is no air coming from the air dryer signal line, replacing the governor may be necessary. On the other hand, if air is present, the focus should be on repairing the air dryer to address the issue effectively.
3. Air Brake Compressor Continues to Struggle with Air Pressure Build-Up Post Governor Removal:
- If removing the governor does not resolve the issue of insufficient air pressure, the next step involves disassembling the unloader mechanism.
- Thoroughly inspect the unloader components for any damage or malfunction. Replace any faulty parts and re-test using the compression gauge to assess the compressor's performance.
4. No Defects Detected in the Uploader:
To address a situation where no issues are found with the uploader, dismantle the necessary components to examine the cylinder head valves and head gasket.
Repair or replace any damaged parts and conduct another test using the compression gauge to ensure the proper functioning of the compressor.
What if no problems were found?
Explore a scenario where no issues are identified during troubleshooting. In such a circumstance, it is possible that the drive is faulty or that a compressor replacement is necessary. Despite thorough troubleshooting efforts, the root cause may remain elusive. However, considering the investment of time and labour costs, it is conceivable that the expense of replacing the compressor could surpass the cumulative costs of extensive troubleshooting.
During the testing process, it is crucial to ensure that the compressor maintains a minimum pressure of 120 psi to indicate its proper functionality. Any deviation from this pressure level may suggest an issue with the air compressor's performance.
Should you encounter a situation where the air pressure is building up slowly or not at all, the root cause is likely to be located within the air system itself. The two primary culprits for such problems are typically a blocked discharge line or a faulty air dryer.
To address a potential blockage in the discharge line, a visual inspection is necessary. Look out for any obstructions or kinks in the line that may be hindering the airflow. Utilising a shop air compressor to blow through the line can help determine if there are any blockages present. If any issues are detected, it is advisable to replace the line promptly to restore proper airflow.
In the case of a malfunctioning air dryer, a practical approach is to bypass it temporarily for testing purposes. By bypassing the air dryer and observing whether the system successfully builds up air pressure, you can ascertain if the air dryer is the source of the problem. If the air compressor functions effectively with the air dryer bypassed, it may be necessary to either repair or replace the air dryer to ensure optimal performance of the system.
Other common Issues with Air Brake Compressors
Why does my air brake compressor cycle constantly
When your air brake compressor is cycling constantly, several components may be at fault. You should focus on troubleshooting the air dryer, air governor, sensing line, or the air compressor unloader. Here are some steps you can take to address this issue:
Remove the air governor sensing line at the governor and utilize regulated shop air to cycle the compressor. If the compressor cycles normally when shop air is supplied and removed, it indicates that the air compressor unloader and governor are functioning correctly. If the issue persists, carefully inspect and replace the unloader parts or governor as necessary.
Inspect the air governor sensing line and fittings for any potential leaks. Leaks in this line can lead to pressure loss and cause the compressor to cycle continuously. If a leak is detected, promptly repair or replace the line to resolve the problem.
If no visible issues are identified, assess the air dryer to ensure it is operating correctly. If any irregularities are found, consider rebuilding or replacing the air dryer to rectify the situation.
By systematically examining and addressing these key components, you can effectively troubleshoot and resolve the issue of your air brake compressor cycling constantly.
Discover a swift and straightforward method to evaluate the efficiency of your diesel air brake compressor with these meticulously designed checks and tests. While there may be occasional exceptions and uncommon scenarios, this diagnostic process is adept at identifying a wide array of potential issues, ensuring a comprehensive evaluation of your compressor's functionality.
Popular brake air compressors
1. Air Brake Compressor Fits Cummins
Fits Cummins Engine 6CT Air Brake Compressor 3558006
Replace Part number: 3558006, 3558006X
Application: Cummins Engine 6CT
Condition: new, aftermarket
Enhance the performance of your Cummins Engine 6CT with the Air Brake Compressor 3558006. This high-quality compressor is designed to perfectly fit your engine, ensuring optimal functionality and efficiency. Upgrade your vehicle with this essential component and experience improved air compression for your braking system. Trust in the reliability of this compressor to enhance your driving experience and keep your engine running smoothly.
2. Air Brake Compressor Fits Volvo
Air Brake Compressor 20429339 Fit for Volvo FH12 FM16 NH12 B12 Type LP4974 II37214
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Part number: 20429339, 3987602, 1628593, 85000064, 8113264, LP4974
Air Brake Compressor 20429339, specifically designed to fit Volvo FH12, FM16, NH12, and B12 models. This high-quality compressor, with the type LP4974 II37214, ensures optimal performance and reliability for your Volvo truck. Trust in this precision-engineered component to deliver the air pressure needed for your braking system, enhancing safety and efficiency on the road. Upgrade your Volvo truck with the Air Brake Compressor 20429339 and experience improved functionality like never before.
3. Air Brake Compressor Fits Benz
New Air Brake Compressor Fit Benz 4071300515
Condition: new, aftermarket
Part Number:
MERCEDES-BENZ 4071300515, MERCEDES-BENZ A4071300515, MERITOR TT0105002, SAMPA 092067, AUGER 79731, LEMA 2748603, LEMA 2748604, LEMA 2748605
Air Brake Compressor designed to perfectly fit your Benz vehicle with the part number 4071300515. This high-quality compressor is engineered to ensure optimal performance and reliability for your Benz model. Upgrade your vehicle's braking system with this precision-made component, crafted to meet the exact specifications of Benz vehicles. Experience enhanced braking efficiency and safety on the road with this Air Brake Compressor.
4. Air Brake Compressor Fits Perkins
Air Brake Compressor 2488A293 LK3835 SEB01599 Fits for Perkins Engine 1004-40 1106D-E66TA 1104C-44
Condition: new, aftermarket
Part number: 2488A293
Fits Perkins Engine 1004-40 1106D-E66TA 1104C-44
Air Brake Compressor 2488A293 LK3835 SEB01599, designed to seamlessly fit Perkins engines including the 1004-40, 1106D-E66TA, and 1104C-44. This high-quality compressor is meticulously crafted for optimal performance and durability. With precision engineering, it ensures reliable operation, making it an essential component for your engine system. Trust in the Air Brake Compressor 2488A293 LK3835 SEB01599 for a seamless and efficient experience with your Perkins engine.
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