1. Introduction
This manual provides essential information for the assembly, operation, and maintenance of your wishiot MOC 4/6 Speed Gearbox V16 Engine Manual Transmission Model building block kit. This kit is designed for enthusiasts of mechanical models and building blocks, offering components for creating various gearbox and engine configurations, including power functions with an M Motor and AA Battery Box.
2. Package Contents
Your package contains a set of loose building block components. The exact components will vary based on the specific model or configuration you purchased (e.g., 4-speed gearbox, 6-speed gearbox, V16 engine, power pack, M motor, AA battery box). Please verify all parts against your order details upon receipt.
Note: This is a loose kit with random color components. It requires self-assembly. Please be careful as small parts are included. Batteries (AA) are not included and must be purchased separately for electric functions.

Figure 1: Assortment of MOC mechanical components (gearboxes, V16 engine, etc.)
3. Specifications
| Feature | Detail |
|---|---|
| Brand Name | wishiot |
| Product Name | MOC gearbox engine |
| Type | Mechanical Group Model Engine Toy |
| Material | Plastic |
| Block Size | Small building block (Compatible with Lego) |
| Recommended Age | 14+ years |
| Origin | Mainland China |
| Electric Functionality | Yes, with M Motor and AA Battery Box (AA batteries not included) |
| High-concerned chemical | None |
4. Setup and Assembly
This kit is designed for creative assembly. Detailed step-by-step instructions for specific models are not provided, encouraging users to design and build their own mechanical creations or follow community-made MOC instructions. The components are compatible with standard small building blocks.
4.1 General Assembly Tips
- Carefully unpack all components and sort them by type or color if desired.
- Refer to the product images for examples of assembled gearboxes and engines.
- Ensure all connections are firm to prevent parts from detaching during operation.
- For complex designs, consider sketching your model or finding inspiration from online MOC communities.
4.2 Power Unit Assembly (AA Battery Box)
The AA Battery Box (Power Unit) is essential for operating electric functions. It measures approximately 5.6cm x 3.2cm x 2.3cm.
- Insert AA batteries (not included) into the battery box according to the polarity markings.
- Connect the M Motor to the battery box using the provided cable.
- Integrate the battery box and motor into your building block model, ensuring the On/Off button and Charging Port are accessible.

Figure 2: AA Battery Box (Power Unit) with controls and dimensions
4.3 Gearbox and Engine Assembly
The kit includes components for various gearboxes (e.g., 4-speed, 6-speed, simplified infinite gearbox) and a V16 engine model. These can be combined with the M Motor for functional mechanical models.

Figure 3: Simplified Infinite Gearbox model

Figure 4: V16 Engine model
5. Operating Instructions
5.1 Power Unit Operation
- Turn On: Press the On/Off button twice quickly to activate the power unit.
- Change Rotation Direction: Press the On/Off button once to reverse the direction of the connected M Motor.
- Turn Off: Press and hold the On/Off button for 3 seconds to power off the unit.
- Charging: Use the Charging Port to recharge the internal battery (if applicable, or for rechargeable AA batteries).
5.2 Gearbox Operation
If your model includes a functional gearbox, you can manually shift gears to control the output speed and torque.

Figure 5: 4-Speed Gearbox with indicated gear positions
- Identify the gear selector mechanism on your assembled gearbox.
- Gently move the selector to engage different gears (e.g., 1st, 2nd, 3rd, 4th).
- Observe how the output shaft speed changes with each gear selection.
6. Maintenance
- Cleaning: Use a soft, dry cloth to gently wipe dust and debris from the building blocks and mechanical components. Avoid using harsh chemicals or abrasive materials.
- Storage: Store the kit and assembled models in a cool, dry place away from direct sunlight and extreme temperatures to prevent material degradation.
- Inspection: Periodically check for any loose or damaged parts. Replace or re-secure as necessary.
7. Troubleshooting
- Motor not turning on:
- Ensure AA batteries are correctly inserted into the battery box and are not depleted.
- Verify that the M Motor is securely connected to the battery box.
- Confirm the power unit is turned on by double-pressing the On/Off button.
- Gearbox not shifting smoothly:
- Check the assembly of the gearbox for any misaligned or improperly connected gears.
- Ensure there is no obstruction preventing the gear selector from moving freely.
- Parts not fitting together:
- Ensure you are using compatible building blocks. This kit is designed for small building blocks compatible with Lego.
- Apply gentle, even pressure. Do not force parts together, as this may cause damage.
8. User Tips
- Assembly Instructions: As this is a MOC (My Own Creation) kit, detailed step-by-step instructions for specific models are generally not included. Embrace the creative process! Many online communities and forums dedicated to MOC building blocks offer inspiration and shared designs.
- Small Parts: Always handle small parts with care to avoid loss or damage. Keep them out of reach of young children.
- Battery Requirement: Remember that AA batteries are required for the electric motor functions and are not supplied with the kit.
- Component Variations: The product images showcase various configurations. Your kit will contain components for the specific option you selected (e.g., a gearbox, a V16 engine, or a power pack).
9. Safety Warnings
WARNING: This product can expose you to chemicals including phthalates (DEHP), which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
- Choking Hazard: This product contains small parts and is not suitable for children under 3 years of age.
- Adult Supervision: Recommended for ages 14+ due to complexity and small parts. Adult supervision is advised for younger users.
- Battery Safety: Follow all battery manufacturer instructions for safe use, storage, and disposal. Do not mix old and new batteries, or different types of batteries.
10. Warranty and Support
For any questions, missing parts, or support inquiries regarding your wishiot MOC building block kit, please contact the seller directly through the platform where you made your purchase. Provide your order number and a clear description of the issue for prompt assistance.