How to Perform Cummins 855 Valve Adjustment Correctly

Adjusting the valves on a Cummins 855 engine is crucial for optimal performance. Proper valve adjustment ensures that your engine runs smoothly and efficiently, prolonging its lifespan. Many owners find the task daunting, but with the correct steps and a little patience, you can learn how to perform the Cummins 855 valve adjustment correctly.

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Understanding the Basics of Valve Adjustment

Before you dive into the adjustment, it's vital to understand a few key concepts. Valves control the movement of air and fuel into the engine and exhaust gases out. If they are not adjusted correctly, the engine can suffer from poor performance or even damage.

Gather Your Tools

Before starting, ensure you have all necessary tools at hand. You will need:

1. Feeler gauge
2. Wrench set
3. Torque wrench
4. Socket set
5. Shop manual for the Cummins 855

Preparing the Engine

Start by preparing your engine. Here’s how:

1. Ensure the engine is cool. It’s best to perform adjustments when the engine is cold to get accurate readings.
2. Disconnect the battery to avoid any accidental starts while you work.
3. Remove any necessary covers to access the valve train.

Setting the Engine to Top Dead Center (TDC)

To make accurate adjustments, you need to position the engine correctly. Follow these steps:

1. Rotate the crankshaft to find the TDC for the cylinder you’re working on.
2. Check your shop manual for the specific marks on the engine that indicate TDC.
3. Make sure both intake and exhaust valves are completely closed for accurate measurements.

Measuring Valve Clearance

Now comes the important part: measuring the valve clearance. Here’s how:

1. Take your feeler gauge and insert it between the valve tip and the rocker arm.
2. Check for a snug fit; it should not be too tight or too loose.
3. Refer to your shop manual for the correct clearance specifications.

Adjusting the Valves

If you find any valves that are out of spec, it’s time to adjust them:

1. Loosen the lock nut on the rocker arm.
2. Turn the adjustment screw to achieve the proper clearance you measured earlier.
3. Once adjusted, hold the screw in place and tighten the lock nut securely.

Final Checks

Once you have adjusted all the valves, perform a final check:

1. Recheck all clearances with the feeler gauge.
2. Replace any covers you removed earlier.
3. Reconnect the battery.

Start the Engine

Finally, start the engine to check your work. Listen closely for any unusual noises. If everything sounds normal, congratulations!

Conclusion

Performing a Cummins 855 valve adjustment can seem complex, but by following these steps, you can do it with confidence. Keeping your engine in top condition will save you time and money in the long run. If you have questions or need assistance, don’t hesitate to contact us or your local supplier for expert help.

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