Adjusting the valves on a Kobelco SK235SR excavator is an important maintenance task that helps ensure the engine runs smoothly and efficiently. click here for more details on the download manual…..
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Here’s a simple, step-by-step guide to help you understand the process, even if you have little mechanical experience.
### Tools and Materials Needed:
1. **Socket set** (including the correct size socket for the valve cover bolts)
2. **Wrench set**
3. **Feeler gauge** (for measuring gaps)
4. **Torque wrench**
5. **Screwdriver**
6. **Shop manual** (for specific specifications)
7. **Clean rag** (for wiping surfaces)
8. **Safety gloves and glasses** (for protection)
### Step-by-Step Guide to Valve Adjustment:
#### 1. **Safety First**
– Ensure the excavator is turned off and the key is removed from the ignition.
– Allow the engine to cool down if it was recently running.
#### 2. **Access the Engine Compartment**
– Open the engine cover to access the engine and valve assembly.
– Depending on your model, you may have to remove some panels or covers to get to the valve cover.
#### 3. **Remove the Valve Cover**
– Use the socket set to remove the bolts securing the valve cover.
– Carefully lift off the valve cover and set it aside. You may need to gently pry it off if it’s stuck.
#### 4. **Locate the Valves and Camshaft**
– Once the valve cover is removed, you will see the camshaft and the valves. Each valve has a rocker arm that presses down on it.
#### 5. **Determine the Correct Valve Clearance**
– Refer to the shop manual for the specific valve clearance specifications for your engine model. This will tell you the acceptable gap between the rocker arm and the valve.
#### 6. **Measure Valve Clearance**
– Using the feeler gauge, measure the gap between the rocker arm and the valve stem.
– Insert the feeler gauge into the gap. It should fit snugly but not too tightly. If it does not fit, it indicates a need for adjustment.
#### 7. **Adjust the Valves**
– If the gap is too wide or too narrow, you will need to adjust it.
– To adjust, find the adjusting screw on the rocker arm.
– Loosen the lock nut with a wrench and turn the adjusting screw:
– **To increase the gap:** Turn the screw counterclockwise.
– **To decrease the gap:** Turn the screw clockwise.
– After making the adjustment, recheck the clearance with the feeler gauge.
#### 8. **Reassemble the Valve Cover**
– Once all valves are adjusted to the correct specifications, clean the gasket surface of the valve cover and the engine.
– Place the valve cover back on
and secure it with the bolts. Use a torque wrench to tighten the bolts to the specified torque from the shop manual.
#### 9. **Final Checks**
– Double-check that everything is tightened securely and that no tools or rags are left in the engine compartment.
– Close the engine cover.
#### 10. **Test the Engine**
– Start the engine and listen for any unusual noises. If everything sounds normal, you’ve successfully adjusted the valves!
### Conclusion
Valve adjustment can seem daunting, but by following these steps carefully and referencing your shop manual, you can complete the task successfully. Remember, if you ever feel unsure, it’s always best to consult a professional mechanic for assistance. Regular maintenance like this helps keep your Kobelco SK235SR running efficiently!
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