Rajan Wilcox
CAV injection pumps, also known as C.A.V. fuel injection pumps, are mechanical inline jerk pump systems designed specifically for diesel engines. They were commonly used in agricultural tractors, commercial vehicles, marine engines, and industrial power units throughout the mid-20th century. The amount of fuel that a CAV injection pump should produce depends on various factors such as the specific application, engine size, and operating conditions. However, it is important to note that CAV injection pumps are known for their precise fuel metering capabilities, delivering the exact amount of fuel required by the engine during each cycle. Understanding the mechanics of these pumps, their maintenance requirements, and common issues are crucial for anyone working with older diesel machinery.
| Characteristics | Values |
|---|---|
| Type of pump | Mechanical, inline, jerk pump system |
| Engine compatibility | Diesel engines |
| Precision | Incredibly tight tolerances between plungers and barrels (often less than 0.0002 inches or 5 microns) |
| Fuel type | Ultra-clean diesel fuel |
| Filter rating | Capturing particles down to 10 microns or less (2-5 microns for CAV pumps) |
| Filter replacement | Every 200-500 hours or 6-12 months |
| Lubrication | Engine oil or oil from the engine's lubrication circuit |
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What You'll Learn
CAV injection pumps: historical background
CAV injection pumps have a long history that dates back to the early 20th century. The company was founded by Charles Anthony Vandervell in 1916 and operated as a competitor to Lucas until the 1930s, when it was acquired by Lucas. Following the acquisition, Lucas entered into a partnership with Robert Bosch to manufacture fuel pumps, with Lucas eventually buying out Bosch's interest in the business. The company was renamed C.A.V. Ltd. in 1978 and then Lucas CAV. Over time, the company changed hands again, becoming Lucas Varity, and was eventually sold to TRW in 1999. The diesel division was then sold to Delphi.
The CAV rotary pump was built under license from the USA company, Stanadyne, which also competed with American Bosch in the USA market for sales of compact rotary pumps. When Stanadyne gained popularity, companies overseas, including Joseph Bosch, Lucas, CAV, and Diesel Kiki, began manufacturing rotary pumps under license from Stanadyne. This led to a unique situation where Bosch was competing with its overseas enterprises, which were producing pumps under license from Stanadyne.
CAV injection pumps have been used in various engines, including the "'Meadows' engine in a Chamberlain tractor" and 4-cylinder Perkins-powered Masseys. However, there is limited information available specifically regarding the fuel output of CAV injection pumps. Antique engine enthusiasts have discussed issues with fuel delivery in CAV injection pumps, suggesting possible solutions such as using automatic transmission fluid in the fuel or checking the fuel supply to the pump.
While the exact fuel output of CAV injection pumps may not be readily available, their historical background sheds light on the evolution of the company and its role in the development of fuel pump technology, particularly in collaboration with other companies such as Lucas and Bosch. The discussions around CAV injection pumps in antique engines highlight the ongoing interest in understanding and maintaining these legacy systems.
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How CAV fuel injection pumps work
CAV injection pumps, also known as CAV D.P.A. injection pumps, are fuel injection pumps used in antique engines such as the "Meadows" engine in a Chamberlain tractor. These pumps are known to be challenging to work with and may require special tools for repair or maintenance.
The primary function of a CAV injection pump is to deliver fuel at high pressure to the injectors. However, there have been reports of challenges in getting high-pressure fuel up to the injectors, resulting in the need for troubleshooting and repairs. One common issue is the presence of air in the system, which can cause the pump to stop functioning. It is crucial to ensure proper fuel supply to the pump, as a lack of fuel will hinder its ability to function effectively.
CAV injection pumps have two main variants: hydraulic governor and mechanical governor. The hydraulic governor variant increases pressure with RPMs, which aids in making the timing advance function properly. It also directs fuel towards the metering valve. When the engine is in the "run" position, the metering valve opens, allowing fuel to pass through to the high-pressure pump plungers. From there, the high-pressure fuel charge continues its journey through a delivery valve.
If the metering valve, pump plungers, or delivery valve becomes stuck, the fuel will not be injected. This issue may require professional attention, especially if special tools are needed for repairs. Additionally, it is important to note that the presence of rust or water in the fuel can cause internal complications, particularly with the governor linkages.
Overall, CAV injection pumps play a crucial role in delivering high-pressure fuel to the injectors in antique engines. While they may pose maintenance challenges, understanding their functioning and common issues can help address problems effectively.
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$9.45
Maintenance and troubleshooting
CAV injection pumps are mechanical devices that deliver precise amounts of fuel to an engine's cylinders, and as such, they require regular maintenance to ensure optimal performance and fuel efficiency. Here are some maintenance and troubleshooting tips for CAV injection pumps:
Regular Inspection and Cleaning
It is important to regularly inspect the CAV injection pump for any signs of leaks, wear, or damage. In the event of a leak, such as a drip problem, it may be necessary to reseal the pump and replace the filters. It is also important to ensure that the pump is kept clean and free of debris, as dirty fuel can cause issues with the pump's performance.
Alignment and Assembly
When reassembling the pump after maintenance or repairs, it is crucial to ensure proper alignment of all components. Markings on the cover and pump can help guide the process, ensuring that the stop arm and lever are in the correct positions. It is also important to refer to a reliable guide or video to ensure that the spring and lever are correctly positioned during reassembly.
Troubleshooting Fuel Issues
If the pump is not delivering fuel to the injectors, there may be an issue with the stop shaft or metering valve. In such cases, it is recommended to check if the tractor can be pull-started, as this may indicate whether the issue lies with the pump or elsewhere. Additionally, the location of the pump may hinder maintenance, making it difficult to see under the cover and control fuel dribbling.
Overhaul and Rebuild
In some cases, a complete pump overhaul or rebuild may be necessary. This can be a complex process, and it is recommended to refer to a detailed guide or video specifically for the type of CAV injection pump in question. Overhaul kits are available, which can provide the necessary tools and components for the job.
Regular Engine Maintenance
Maintaining the engine as a whole is also crucial to ensuring the optimal performance of the CAV injection pump. This includes regularly changing fuel filters, as old and clogged filters can impact fuel flow and pump performance.
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Modern alternatives
CAV injection pumps were used in a variety of diesel engines, especially from the 1940s through the 1980s. They are mechanical, inline, jerk pump systems designed specifically for diesel engines. While they are reliable when maintained, they lack the efficiency, emissions compliance, and performance flexibility of modern systems.
There are several modern alternatives to CAV injection pumps that offer improved efficiency, emissions compliance, and performance flexibility:
- Refurbished Replacement Pump: For vintage machinery, locating a professionally refurbished and calibrated pump that is identical to the original CAV pump is often the most cost-effective and straightforward solution. Examples include the DPA, DPS, and Minimec pumps.
- New Mechanical Equivalent Pump: Aftermarket manufacturers offer brand new mechanical injection pumps designed as direct replacements for specific CAV models. These pumps are engineered for reliability and ease of installation in popular engines like Perkins 4.236 or Ford tractors.
- Reconversion to Newer Electronic Systems: This option involves replacing the pump and injector lines with electronically controlled injectors, such as Electronic Unit Injectors (EUI). While this is a major undertaking, it offers significant benefits in terms of performance and emissions compliance.
- Modern Electronic Systems: Unlike CAV pumps, modern electronic fuel injection systems use electronically controlled injectors, offering improved precision, efficiency, and emissions compliance. These systems do not rely on mechanical components driven by the engine's rotation and can be more easily calibrated and maintained.
When considering modern alternatives to CAV injection pumps, it is important to carefully evaluate the viability and complexity of electronic conversion projects versus sourcing refurbished mechanical units. Proper maintenance and calibration of CAV pumps can also extend their reliable service life.
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Injector pump problems and solutions
Cav injection pumps are essential components in diesel engines, delivering precise fuel amounts to the engine to ensure optimal combustion. Proper fuel delivery improves engine power and reduces emissions.
One of the most common issues with Cav injection pumps is air leaks, which can affect performance. To solve this, perform a fuel quality check and inspect the pump for any signs of wear or damage, including loose or damaged connections, cracks, or leaks. Ensure all bolts and fittings are secure.
Worn-out seals are another issue that can cause fuel leaks. Dirty fuel can also clog the pump, leading to reduced efficiency and engine problems. Regular maintenance and cleaning of the fuel filter are crucial to preventing these issues. Make sure to purchase clean fuel and keep the fuel tank supplied at all times.
If your engine experiences hard starting, poor acceleration, rough idling, or stalling, it could be due to a faulty Cav injection pump. Unusual noises from the engine, such as knocking, squealing, or grinding, can also indicate pump issues and should not be ignored. In such cases, it is important to inspect the pump immediately to prevent further damage.
For persistent problems, it is recommended to consult a specialist. Regular maintenance checks by a qualified technician can help ensure your pump runs smoothly, and modern diagnostic tools can quickly identify the root cause of any issues.
Additionally, automatic transmission fluid (ATF) has been known to cure distributor-type pumps like the Cav. Try filling the filters with ATF, getting the pump full of it, and letting it sit for a day or two.
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