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Replacing the planetary gear in a Mazda 6 sedan’s gearbox is a task that requires a solid understanding of automotive mechanics, a good grasp of your tools, and, of course, a bit of patience. So, let’s dive into the detailed process, starting from the tools you’ll need all the way through to the last bolt you’ll tighten.
### Tools and Equipment Needed
1. **Socket Set**: A comprehensive socket set is essential. You’ll need both metric and standard sizes since the Mazda 6 may have a mix of fastener sizes. A 10mm, 12mm, and 14mm socket are commonly used for various bolts.
2. **Ratchet Wrench**: A 3/8-inch and possibly a 1/2-inch drive ratchet will help you easily remove and install bolts.
3. **Torque Wrench**: This tool is crucial for tightening bolts to the manufacturer’s specified torque. It ensures that you don’t overtighten or undertighten any components.
4. **Pliers**: Needle-nose pliers and regular pliers will help you manipulate small clips and connectors.
5. **Screwdrivers**: A set of flathead and Phillips screwdrivers will be necessary for various screws and clips.
6. **Transmission Jack**: Since you’ll be working with the gearbox, a transmission jack is important for safely supporting and lowering the transmission.
7. **Oil Drain Pan**: To catch any fluid that will leak out when you remove the gearbox.
8. **Gasket Scraper**: This will help you clean any remnants of old gasket material when you reassemble the gearbox.
9. **Sealant**: A high-quality RTV sealant is often used to ensure a proper seal on the gearbox cover.
10. **Shop Manual**: While not a tool in the traditional sense, having the service manual for your specific model is invaluable for torque specifications and detailed diagrams.
### Preparation
Before you even start, ensure that you have the vehicle on a flat surface and securely elevated on jack stands. Safety is paramount! Disconnect the negative battery terminal to avoid any electrical issues while you’re working.
### Step-by-Step Process
1. **Drain the Transmission Fluid**:
– Place the oil drain pan under the transmission pan and remove the drain plug using a socket. Allow the fluid to drain completely. This step is crucial; if you skip it, you’ll have a mess on your hands when you remove the gearbox.
2. **Remove the Transmission Pan**:
– Using your ratchet and socket, remove the bolts securing the transmission pan. Carefully pry it loose with a flathead screwdriver if necessary. Be prepared for more fluid to leak out when you remove the pan.
3. **Disconnect Components**:
– You’ll need to disconnect various electrical connectors, shift linkage, and possibly the exhaust system, depending on your specific model. Take pictures as you go to remember where everything connects.
4. **Support the Transmission**:
– Position the transmission jack under the gearbox. Make sure it’s secure before you start removing bolts.
5. **Remove the Transmission Mounts**:
– Using your socket set, remove the bolts holding the transmission mounts in place. You may need to support the engine with an engine hoist or a jack to prevent it from tilting.
6. **Unbolt the Transmission from the Engine**:
– There will be several bolts connecting the transmission to the engine. Carefully remove these bolts, keeping track of their sizes and locations.
7. **Lower the Transmission**:
– Once all bolts are removed and everything is disconnected, slowly lower the transmission using the transmission jack. Make sure you have enough clearance to pull it out without hitting anything.
8. **Remove the Gearbox**:
– With the transmission lowered, you’ll need to detach the gearbox. This may involve unbolting the bell housing. Again, be sure to keep track of all hardware as you go.
9. **Access the Planetary Gears**:
– With the gearbox out, you’ll need to remove the rear cover of the gearbox. This can be done by unscrewing the bolts around the cover. Carefully pry it off to avoid damaging the sealing surfaces.
10. **Remove the Planetary Gear Assembly**:
– Once you have access to the internals, you might need to remove a snap ring or retaining clips holding the planetary gear assembly in place. Use needle-nose pliers for this. Carefully lift out the planetary gears; be cautious not to lose any small components.
11. **Replace the Planetary Gears**:
– Install the new planetary gear assembly in the reverse order of removal. Ensure everything is seated properly and that any retaining clips or snap rings are securely in place.
12. **Reassemble the Gearbox**:
– Replace the rear cover, applying a new gasket or sealant as necessary. Ensure the cover is torqued to the specifications provided in your service manual.
13. **Reinstall the Gearbox**:
– Lift the gearbox back into place using the transmission jack. Carefully align it with the engine and secure it with bolts. Reconnect all electrical connectors and the shift linkage.
14. **Reinstall the Transmission Pan**:
– Replace the transmission pan, ensuring you’ve got a new gasket in place. Tighten the bolts in a crisscross pattern to ensure even pressure.
15. **Refill Transmission Fluid**:
– Once everything is back together, refill the transmission with the appropriate type and amount of fluid as specified in your service manual.
16. **Reconnect the Battery**:
– Finally, reconnect the negative battery terminal and start the vehicle. Allow it to idle and check for any leaks around the transmission pan or gearbox.
### Conclusion
And there you have it! The detailed process of replacing the planetary gears in a Mazda 6 sedan’s gearbox. It’s a labor-intensive job that requires diligence and attention to detail, but with the right tools and a methodical approach, you can tackle it successfully. Always remember to refer to your service manual for specific torque specs and procedures for your year and model. Happy wrenching!
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