Learn How to Decarb Your Diahatsu Generator and Adjust Tappet Clearances

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Learn How to Decarb Your Diahatsu Generator and Adjust Tappet Clearances

Table of Contents:

  1. Introduction
  2. Understanding Tapper Clearance
  3. Methods to Determine the Firing Unit
  4. Zero Setting
  5. Tapper Setting
  6. Checking the Tapper Clearance
  7. Tightening the Lock Nuts
  8. Importance of Torque Tightening
  9. Conclusion
  10. Frequently Asked Questions (FAQ)


Understanding Tapper Clearance

To properly adjust the tapper clearance in a Daihatsu generator, you need to bring the unit to Top Dead Center (TDC) and determine the firing unit. There are two methods to determine the firing unit: observing the camshaft or checking the rocker arm for free movement. Once you have identified the firing unit, you can proceed with the tapper clearance adjustment.

Methods to Determine the Firing Unit

Method 1: Observing the Camshaft By examining the fuel cam, you can determine if it is in the firing order. If the peak of the fuel cam is downwards, that means it is not going to fire. Conversely, if the peak is near the roller, it indicates that the unit is going to fire. This method helps identify the firing unit accurately.

Method 2: Checking the Rocker Arm You can also determine the firing unit by checking the free movement of the rocker arm. When the unit is in firing order, the rocker arm should turn freely. If it cannot turn, it means that unit is not the firing unit. By applying this method to both the number one and number six units, you can identify the firing unit accurately.

Zero Setting

Before adjusting the tapper clearance, it is crucial to perform the zero setting. This can be done using a dial indicator and a magnetic base. The dial gauge pointer should be centered on the yoke. The zero setting ensures accurate measurement of the tapper clearance.

Tapper Setting

The tapper setting refers to the gap between the rocker arm and the yoke. Using a feeler gauge, loosen the screw and place the feeler gauge between the rocker arm and yoke. Slowly turn the rocker arm nut lock screw until the feeler gauge fits snugly. Repeat this process for each rocker arm.

Checking the Tapper Clearance

After setting the tapper clearance, it is essential to verify its accuracy. Using a larger feeler gauge, check if the clearance is correctly set. The 0.6 feeler gauge should fit between the rocker arm and yoke, while the 0.7 gauge should not fit. This ensures the tapper clearance is within the desired range.

Tightening the Lock Nuts

Once the tapper clearance is set, tighten the lock nuts for both the rocker arm and yoke. Use a torque wrench to ensure proper tightening. Follow the torque tightening values specified in the manufacturer's manual. This step helps secure the tapper clearance adjustments.

Importance of Torque Tightening

Torque tightening is crucial to maintain the accuracy of the tapper clearance. Using the specified torque values, tighten the lock nuts to prevent any loosening that could affect the engine's performance. Torque tightening ensures consistent and reliable tapper clearance settings.


Adjusting the tapper clearance in a Daihatsu generator is a crucial maintenance task. By following the methods discussed and properly setting the tapper clearance, you can ensure optimal engine performance. Regular checks and adjustments of the tapper clearance contribute to the longevity and efficiency of the generator.

Frequently Asked Questions (FAQ)

Q: Why is tapper clearance adjustment necessary? A: Tapper clearance adjustment ensures proper valve operation and prevents engine damage due to incorrect clearance.

Q: How often should I check the tapper clearance in my Daihatsu generator? A: It is recommended to check and adjust the tapper clearance during regular maintenance intervals or as per the manufacturer's guidelines.

Q: Can I adjust the tapper clearance without a torque wrench? A: Using a torque wrench is highly recommended to achieve the correct torque tightening and ensure accurate tapper clearance settings.

Q: What are the consequences of incorrect tapper clearance? A: Incorrect tapper clearance can lead to valve damage, poor engine performance, and increased fuel consumption.

Q: Can I adjust the tapper clearance myself, or should I seek professional assistance? A: Adjusting the tapper clearance requires technical knowledge and precision. If you are not confident in your abilities, it is advisable to seek professional assistance to avoid any potential damage to the engine.

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