Replacing the transmission pan gasket on a Subaru Impreza, whether it has a General SOHC or DOHC engine, is a task that requires careful preparation and execution. click here for more details on the download manual…..
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Below is a detailed guide on how to perform this replacement, including descriptions of all necessary components and steps involved.
### Tools and Materials Needed
1. **Tools:**
– Ratchet and socket set (including a torque wrench)
– Screwdrivers (flathead and Phillips)
– Pliers
– Gasket scraper or razor blade
– Torque wrench
– Oil catch pan
– Funnel
2. **Materials:**
– New transmission pan gasket
– Transmission fluid (specific to your Subaru’s requirements)
– Cleaning solvent (like brake cleaner or degreaser)
– Rags or shop towels
– Safety glasses
– Gloves
### Step-by-Step Procedure
#### 1. Prepare the Vehicle
– **Safety First:** Ensure the vehicle is on a level surface. Engage the parking brake and wear safety glasses and gloves.
– **Lift the Vehicle:** Use a jack to lift the front of the vehicle and secure it with jack stands. Make sure it is stable before working underneath.
#### 2. Drain the Transmission Fluid
– **Locate the Drain Plug:** Underneath the transmission pan, identify the drain plug.
– **Position Oil Catch Pan:** Place the oil catch pan underneath the drain plug to catch the old transmission fluid.
– **Remove the Drain Plug:** Use the appropriate socket to loosen and remove the drain plug. Allow the fluid to drain completely.
#### 3. remove the Transmission Pan
– **Unbolt the Pan:** Using the ratchet and socket, remove the bolts holding the transmission pan in place. Keep track of the bolts for reinstallation.
– **Gently Tap the Pan:** If the pan is stuck due to old gasket material, gently tap it with a rubber mallet to loosen it.
– **Remove the Pan:** Carefully lower the pan, ensuring that any old fluid inside is caught by the oil catch pan.
#### 4. Clean the Transmission Pan and Surface
– **Clean the Pan:** Use a gasket scraper or razor blade to remove old gasket material from the transmission pan and the transmission case. Be careful not to scratch the surfaces.
– **Degrease the Pan:** Clean the inside and outside of the pan with a cleaning solvent and rags. Ensure it is free of debris.
#### 5. install the New Gasket
– **Position the New Gasket:** Place the new gasket onto the transmission pan. Ensure it is aligned properly and seated evenly.
– **Use Gasket Sealant (if recommended):** Some gasket types may require a thin layer of gasket sealant on one side to ensure a proper seal.
#### 6. Reinstall the Transmission Pan
– **Align the Pan:** Carefully lift the transmission pan back into place, ensuring the gasket stays aligned.
– **Bolt Down the Pan:** Hand-tighten the bolts in a cross pattern to ensure even pressure. Then use the torque wrench to tighten them to the manufacturer’s specifications (usually around 7-10 ft-lbs, But check your specific model’s service manual for exact specs).
#### 7. Refill the Transmission Fluid
– **Replace the Drain Plug:** Reinstall and tighten the drain plug securely.
– **Add New Fluid:** Locate the transmission dipstick tube. Use a funnel to add new transmission fluid through the dipstick tube. Refer to your owner’s manual for the correct fluid type
and amount.
#### 8. Check for Leaks
– **Start the Engine:** Start the vehicle and let it idle for a few minutes. Shift through all gears to circulate the fluid, then return to park.
– **Check Fluid Level:** With the engine running, check the fluid level using the dipstick. Add more fluid as needed.
– **Inspect for Leaks:** look underneath the vehicle for any signs of leaking fluid from the transmission pan.
#### 9. Lower the Vehicle
– **Remove Jack Stands:** After confirming there are no leaks, safely remove the jack stands and lower the vehicle to the ground.
#### 10. Dispose of Old Fluid
– **Environmental Responsibility:** Dispose of the old transmission fluid and any used materials at a recycling center that accepts automotive fluids.
### Conclusion
Replacing the transmission pan gasket on a Subaru Impreza involves careful attention to detail and proper safety precautions. By following these steps and using the right tools and materials, you can successfully complete the replacement and ensure your transmission operates efficiently. Always refer to your vehicle’s service manual for specific torque specifications and fluid capacities to ensure accuracy.
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