How Do You Perform a Cummins 855 Valve Adjustment?
Performing a valve adjustment is a crucial maintenance task for any engine, particularly for the iconic Cummins 855 series. This robust engine, renowned for its power and durability, serves in various applications, from industrial to transportation. Regular maintenance, such as the Cummins 855 valve adjustment, can help ensure optimal performance and longevity of the engine.
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The Cummins 855 engine is characterized by its inline six-cylinder design, robust build, and impressive torque characteristics. It has been a popular choice for heavy-duty applications due to its reliability and relatively straightforward maintenance procedures. Among these maintenance tasks, the valve adjustment is essential, as it helps maintain engine efficiency, allows for better fuel consumption, and ensures that the engine runs smoothly.
To begin with the Cummins 855 valve adjustment process, it's essential to gather the necessary tools. You will need a feeler gauge, a wrench set, a socket set, and a torque wrench. Other helpful tools include a shop manual specific to the Cummins 855, which provides vital specifications and clear guidelines for the adjustment process.
Before starting the valve adjustment, ensure that the engine is cool. This will help prevent any overheating issues and enable a more accurate adjustment. First, remove the valve cover to gain access to the rocker arms and valve train components. Take time to inspect the area for any signs of wear or damage, which could indicate a requirement for more in-depth repairs.
Once you have accessed the rocker arms, turn the engine over until the number one cylinder is at top dead center (TDC) on the compression stroke. You can identify this by looking at the timing marks on the crankshaft and the corresponding position of the valves. At this point, you will be able to access the rocker arms for the number one cylinder, which should be adjusted first.
Using the feeler gauge, measure the clearance between the rocker arm and the valve stem. Cummins typically recommends a specific clearance measurement, which you can find in your shop manual. If the clearance is outside the prescribed range, loosen the adjusting nut on the rocker arm while maintaining the current position with a wrench. Adjust the rocker arm until the desired clearance is achieved, then re-tighten the adjusting nut and recheck the clearance to ensure it remains within specifications.
After successfully adjusting the valves on the number one cylinder, the process is repeated for the remaining cylinders, following the firing order. It’s important to maintain the same top dead center position for each cylinder before making adjustments. This systematic approach will help to avoid any mistakes that can lead to engine performance issues.
Once all valves are adjusted, the next step in the Cummins 855 valve adjustment process is to re-install the valve cover, ensuring all gaskets are properly seated to prevent any leakage. After everything is back in place, run the engine for a few minutes to allow it to reach normal operating temperatures and ensure that all adjustments have held firm.
Maintaining your Cummins 855 engine through regular valve adjustments is crucial for preserving its performance and extending its lifespan. By taking the time to perform a professional valve adjustment, you can help ensure that your engine operates smoothly, effectively, and efficiently.
For those who might feel uneasy about performing a Cummins 855 valve adjustment themselves, or if you're simply looking for professional assistance, consulting a qualified technician can provide peace of mind and guarantee that the job is done correctly.
If you are ready to take the next step in maintaining your Cummins 855 engine, whether it’s tackling a valve adjustment or just seeking more information, do not hesitate to reach out! Proper maintenance keeps your engine running at its best, so get started today!
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