The best valve spring compressor tool for removing springs without removing the cylinder head is typically a specialized overhead valve spring compressor. These tools are designed to work with the engine still in the vehicle, allowing for efficient and safe removal of valve springs. One highly recommended option is the "Lisle 36050 Valve Keeper Remover and Installer Kit." This tool is known for its durability, ease of use, and ability to work on a wide range of vehicles. It features a lever mechanism that compresses the spring while allowing access to the valve keepers, making the process straightforward. Another popular choice is the "OTC 4572 Large Valve Spring Compressor." This tool is adjustable and can accommodate various spring sizes, making it versatile for different engine types. It has a robust construction and a long handle for better leverage, which is crucial for compressing strong valve springs. For those looking for a more budget-friendly option, the "ABN Valve Spring Compressor C-Clamp Tool Set" is a good choice. It includes multiple adapters and a C-clamp design that can be used on a variety of engines. While it may require more manual effort compared to lever-type compressors, it is effective and reliable for DIY enthusiasts. Ultimately, the best tool depends on the specific engine type, the user's experience level, and budget. It's important to ensure that the chosen tool is compatible with the engine's valve spring size and configuration.

1. **Preparation**: Ensure the engine is off and cool. Remove the valve cover to access the valve springs. Disconnect the battery for safety. 2. **Positioning**: Rotate the engine to position the piston at top dead center (TDC) for the cylinder you are working on. This prevents the valve from dropping into the cylinder. 3. **Remove Components**: Remove any components obstructing access to the valve springs, such as the rocker arms or camshaft, depending on the engine design. 4. **Attach the Tool**: Place the valve spring compressor tool over the valve spring. Ensure the tool's jaws or arms are securely positioned on the spring retainer. 5. **Compress the Spring**: Turn the tool's handle or screw mechanism to compress the spring. This will relieve pressure on the valve keepers (or locks). 6. **Remove Valve Keepers**: Once the spring is compressed, use a magnet or small tool to carefully remove the valve keepers. Be cautious as they are small and can easily be lost. 7. **Release the Spring**: Slowly release the tension on the spring by reversing the tool's mechanism. Remove the spring and retainer. 8. **Inspect and Replace**: Inspect the valve, spring, and related components for wear or damage. Replace if necessary. 9. **Reinstallation**: Place the new or inspected spring and retainer back onto the valve. Compress the spring using the tool and reinstall the valve keepers. 10. **Final Steps**: Release the spring tension carefully, ensuring the keepers are seated properly. Reassemble any removed components and reinstall the valve cover. 11. **Test**: Reconnect the battery, start the engine, and check for proper operation.

1. **COMP Cams Valve Spring Tester**: Known for its precision and durability, this tool is highly rated for its ability to measure spring tension accurately. It is often used by professional engine builders and offers a digital readout for easy interpretation. 2. **Proform Valve Spring Tester**: This tool is popular for its affordability and reliability. It features a simple design with a clear gauge, making it user-friendly for both professionals and hobbyists. 3. **Moroso Valve Spring Tester**: Moroso offers a range of testers that are praised for their robust construction and accuracy. They are designed to handle high-performance applications and provide consistent readings. 4. **Lunati Valve Spring Tester**: Lunati's testers are favored for their precision and ease of use. They are compact and portable, making them ideal for on-the-go measurements. 5. **JEGS Valve Spring Tester**: JEGS provides a cost-effective solution without compromising on quality. Their testers are straightforward and reliable, suitable for various engine types. 6. **Powerhouse Products Valve Spring Tester**: Known for their innovative design, Powerhouse testers offer digital and analog options. They are appreciated for their accuracy and ease of calibration. 7. **Intercomp Valve Spring Tester**: Intercomp's testers are designed for high accuracy and are often used in professional racing environments. They offer digital models with advanced features for detailed analysis. 8. **K-Tool International Valve Spring Tester**: This tool is recognized for its affordability and basic functionality, making it a good choice for beginners or those on a budget. These tools are selected based on their accuracy, ease of use, durability, and customer reviews, making them top choices for measuring valve spring tension.

To measure valve spring height accurately, follow these steps: 1. **Remove the Spring**: Disassemble the engine to access the valve spring. Remove the spring from the cylinder head carefully. 2. **Clean the Spring**: Ensure the spring is clean and free from oil, dirt, or debris that might affect the measurement. 3. **Use a Valve Spring Height Micrometer**: This specialized tool is designed for measuring valve spring height. It consists of a micrometer with a base that fits over the valve guide or seat. 4. **Position the Micrometer**: Place the micrometer over the valve guide or seat where the spring normally sits. Ensure it is stable and properly aligned. 5. **Adjust the Micrometer**: Turn the micrometer’s thimble until the anvil contacts the spring seat. The micrometer should be perpendicular to the seat for an accurate reading. 6. **Read the Measurement**: Once the micrometer is properly adjusted, read the measurement on the micrometer scale. This reading is the installed height of the valve spring. 7. **Compare with Specifications**: Compare the measured height with the manufacturer’s specifications for the engine. This ensures the spring is within the required tolerance for proper engine performance. 8. **Repeat if Necessary**: If the measurement is not within specifications, consider replacing the spring or adjusting the spring seat as needed. 9. **Reassemble**: Once measurements are confirmed, reassemble the engine components, ensuring all parts are correctly installed. Using a valve spring height micrometer ensures precision and accuracy, which is crucial for maintaining engine performance and longevity.

1. **Preparation**: Ensure the engine is off and cool. Gather necessary tools: valve spring compressor, micrometer or caliper, valve spring tester, and safety gear. 2. **Access the Valve Springs**: Remove the valve cover by loosening the bolts. This exposes the valve springs. 3. **Remove the Valve Springs**: Use a valve spring compressor to compress the spring. Remove the keepers or locks, then carefully release the compressor to remove the spring. 4. **Measure Free Length**: Use a caliper or micrometer to measure the free length of the spring. Compare it to the manufacturer's specifications to ensure it hasn't sagged. 5. **Check for Squareness**: Stand the spring on a flat surface next to a square. Roll the spring to check for any wobble, indicating it is not square. 6. **Test Spring Tension**: Place the spring in a valve spring tester. Compress the spring to the specified height (usually the installed height) and read the force measurement. Compare this to the manufacturer's specifications for spring tension. 7. **Inspect for Damage**: Visually inspect the spring for any signs of wear, cracks, or damage. 8. **Reinstall or Replace**: If the spring meets specifications, reinstall it using the valve spring compressor. If not, replace it with a new spring that matches the required specifications. 9. **Reassemble**: Once all springs are checked and installed, replace the valve cover and tighten the bolts to the specified torque. 10. **Final Check**: Start the engine and listen for any unusual noises, indicating a potential issue with the valve springs.

Valve lapping tools are commonly recommended for seating valves properly. These tools help ensure a tight seal between the valve and the valve seat, which is crucial for engine efficiency and performance. A popular choice is a valve lapping stick, which typically has a wooden or plastic handle with a rubber suction cup at the end. This tool is used in conjunction with valve grinding compound, a gritty paste that aids in the grinding process. For more precision, a valve lapping machine can be used. These machines automate the lapping process, providing consistent pressure and motion, which can lead to a more uniform seal. Brands like Kwik-Way and Sioux offer reliable valve lapping machines. Additionally, a valve seat cutter or grinder can be used to refinish the valve seat before lapping. This ensures that the seat is perfectly round and at the correct angle, which is essential for proper valve seating. Brands like Neway offer high-quality valve seat cutters. For those looking for a comprehensive solution, a valve seat and guide machine can be used. These machines not only cut and grind the valve seat but also ensure that the valve guide is properly aligned, which is crucial for valve seating. In summary, for manual lapping, a valve lapping stick and grinding compound are essential. For more precision and efficiency, consider a valve lapping machine or a valve seat cutter. For comprehensive valve and seat work, a valve seat and guide machine is recommended.

To ensure the correct installation of valve springs using measuring tools, follow these steps: 1. **Inspect the Valve Springs**: Check for any physical damage or irregularities. Ensure they match the specifications for your engine. 2. **Measure Free Length**: Use a caliper to measure the free length of the spring. Compare it with the manufacturer's specifications to ensure it hasn't sagged. 3. **Check Spring Squareness**: Place the spring on a flat surface next to a square. Measure the deviation from the square to ensure it is within tolerance. 4. **Measure Spring Pressure**: Use a spring tester to measure the spring's pressure at the installed height and at full lift. Compare these values with the specifications to ensure proper performance. 5. **Determine Installed Height**: Use a valve spring micrometer to measure the installed height. This is the distance from the spring seat to the bottom of the retainer. Adjust with shims if necessary to match the specified installed height. 6. **Check Coil Bind Clearance**: Measure the distance between the coils at full lift using a feeler gauge. Ensure there is adequate clearance to prevent coil bind, which can cause damage. 7. **Verify Retainer Fit**: Ensure the retainer fits properly on the spring and locks securely with the valve locks. 8. **Check for Interference**: Use a dial indicator to check for any interference between the spring and other engine components during operation. 9. **Recheck After Installation**: Once installed, recheck the installed height and pressure to confirm they remain within specifications. By systematically using these measuring tools and techniques, you can ensure the valve springs are installed correctly, maintaining engine performance and longevity.