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On September 20, 2019, a peculiar issue was reported regarding the idle performance of a CAV rotary injector pump. The user described the idle as sounding strange, almost as if the governor was hunting. In an attempt to diagnose the problem, the user loosened each of the injector feeds momentarily, only to find that all cylinders were firing roughly. This led to suspicions that there might be an issue with the idle screw O-ring within the CAV rotary injector pump.
I recently had to replace the o-rings on the top of my fuel injection pump on at
Cav Fuel Injection Pump Problems
The CAV fuel injection pump is a crucial component in the operation of diesel engines, responsible for delivering the correct amount of fuel at the right time to ensure optimal combustion. However, like any mechanical device, the CAV fuel injection pump is susceptible to problems. Common issues that may arise with CAV fuel injection pumps include:
1. **Poor Fuel Economy**: If the fuel injection pump is not delivering the correct amount of fuel, it can result in poor fuel economy as the engine may be running too rich or too lean.
2. **Hard Starting**: A faulty fuel injection pump can make it difficult to start the engine, causing delays and frustration for the operator.
3. **Loss of Power**: When the fuel injection pump is not functioning properly, the engine may experience a loss of power, affecting performance and productivity.
4. **Excessive Smoke**: An improperly functioning fuel injection pump can lead to excessive smoke emissions from the exhaust, indicating incomplete combustion.
87 3910 Cav Injection Pump
The 87 3910 CAV injection pump is a specific model within the CAV range of fuel injection pumps. While CAV pumps are known for their reliability and efficiency, issues can still arise with the 87 3910 model. Some common problems reported with the 87 3910 CAV injection pump include:
1. **Leaking Seals**: Over time, the seals in the pump may degrade, leading to fuel leaks and potential performance issues.
2. **Idle Instability**: As seen in the case mentioned earlier, idle instability can be a symptom of a faulty CAV injection pump, possibly related to components such as the idle screw O-ring.
3. **Inconsistent Fuel Delivery**: If the pump is not delivering fuel consistently, it can result in engine misfires and poor performance.
4. **Excessive Noise**: Unusual noises coming from the injection pump may indicate internal damage or wear that needs to be addressed.
Cav Pump Problems After Seal
Issues that arise with CAV pumps after seal replacement can be particularly frustrating for users. While replacing seals is a common maintenance task to prevent leaks and ensure proper functioning, it can sometimes lead to new problems if not done correctly. Some potential problems that may occur after seal replacement in a CAV pump include:
1. **Improper Seal Installation**: If the seals are not installed correctly, it can result in leaks and performance issues.
2. **Air Ingress**: Improperly sealed components can allow air to enter the system, affecting fuel delivery and combustion.
3. **Pressure Loss**: Seals play a critical role in maintaining proper pressure within the pump, and any issues with the seals can lead to pressure loss and performance degradation.
4. **Seal Degradation**: If the new seals used for replacement are of poor quality, they may degrade quickly, necessitating frequent replacements.
The idle sounds weird to me, like the governor is hunting. I momentarily loosened each of the injector feeds and all caused the same rough, so I know all cylinders are firing ...
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cav rotary injector pump idle screw o-ring|87 3910 cav pump problems