Replacing the transmission output shaft on a BMW 5 Series (E28 or E34) can be a complex task, but I’ll break it down into simpler steps. download manual more information here…..
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Before you start, make sure you have the necessary tools and safety gear, like gloves and safety glasses. It’s also a good idea to have a repair manual specific to your car for reference.
### Tools and Materials Needed:
– Jack and jack stands (or a lift)
– Wrenches and sockets (various sizes)
– Screwdrivers (flathead and Phillips)
– Pliers
– Torque wrench
– Replacement output shaft
– Transmission fluid (if needed)
– Drain pan
– Rags for cleanup
– Safety glasses and gloves
### Step-by-Step Guide:
#### 1. **Safety First:**
– Park the car on a flat surface and engage the parking brake.
– Disconnect the battery to prevent any electrical issues.
#### 2. **Lift the Car:**
– Use a jack to lift the rear of the car and secure it with jack stands. Ensure it’s stable before crawling underneath.
#### 3. **Drain the Transmission Fluid:**
– Place a drain pan under the transmission. Locate the drain plug (usually on the bottom of the transmission) and remove it to let the fluid drain completely. Replace the drain plug once done.
#### 4. **Remove the Driveshaft:**
– Locate the driveshaft that connects the transmission to the rear differential. You’ll need to unbolt it from both the transmission and the rear differential.
– Mark the position of the driveshaft so you can align it correctly when you reinstall it.
– Carefully slide the driveshaft out and set it aside.
#### 5. **Access the Output Shaft:**
– Depending on the design, you may need to remove the transmission from the vehicle to access the output shaft. This typically involves unbolting the transmission from the engine and supporting it with a transmission jack or similar tool.
– Disconnect any wiring or linkage connected to the transmission.
#### 6. **Remove the Transmission:**
– Once everything is disconnected, carefully lower the transmission from the vehicle. Be cautious, as it can be heavy and awkward.
#### 7. **Replace the Output Shaft:**
– With the transmission out, you can now access the output shaft. Remove the retaining bolts or clips that hold the output shaft in place.
– Carefully slide the old output shaft out and replace it with the new one. Ensure it is seated properly.
#### 8. **Reassemble the Transmission:**
– Reattach any bolts or clips that hold the output shaft in place.
– If you removed the transmission pan or any other components, reattach those as well.
#### 9. **Reinstall the Transmission:**
– Lift the transmission back into place, aligning it with the engine and ensuring it fits securely. Reattach all bolts and reconnect any wiring or linkage you previously disconnected.
#### 10. **Reattach the Driveshaft:**
– Slide the driveshaft back into position and bolt it back to both the transmission
and rear differential, using the marks you made earlier for alignment.
#### 11. **Refill Transmission Fluid:**
– If you drained the transmission fluid, refill it with the appropriate type and amount of transmission fluid. Check your owner’s manual for specifications.
#### 12. **Reconnect the Battery:**
– Reconnect the battery terminals.
#### 13. **Test the Vehicle:**
– Start the car and let it run for a few minutes. Check for leaks around the transmission and ensure everything is functioning properly.
#### 14. **Lower the Vehicle:**
– If everything looks good, carefully lower the vehicle from the jack stands.
### Final Thoughts:
This process requires attention to detail and patience. If at any point you feel uncertain, it’s wise to consult a professional mechanic. Always refer to a repair manual for specific torque specifications and procedures related to your vehicle model. Good luck!
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