Repairing or replacing the shift drum in a BMW 740i or 740iL involves several steps. click here for more details on the download manual…..
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Here’s a reverse order breakdown of the process:
### 7. Reassemble the Transmission
– Reinstall the transmission pan and secure it with bolts.
– Reattach the transmission cooler lines and electrical connectors.
– Ensure all components are properly connected and tightened.
### 6. Install the New Shift Drum
– Carefully position the new shift drum in place.
– Align it with the shift forks and ensure it moves freely.
– Secure it according to the manufacturer’s specifications.
### 5. Remove the Old Shift Drum
– Disconnect the shift linkage and any associated wiring.
– Remove any retaining clips or bolts holding the old shift drum in place.
– Gently take out the old drum, being cautious not to damage surrounding components.
### 4. Prepare the Transmission for Access
– Drain the transmission fluid using a pan to catch any spills.
– Remove the transmission pan by unscrewing the bolts and carefully lifting it off.
– Depending on the model year, you may need to remove the valve body or other components to access the shift drum.
### 3. Lift the Vehicle
– Park the BMW on a flat surface and engage the parking brake.
– Use a jack to lift the front of the vehicle and secure it on jack stands.
### 2. Gather the Necessary Tools and Parts
– Obtain a replacement shift drum, appropriate tools (socket set, wrenches, etc.), and transmission fluid.
– Have a clean workspace ready for the disassembly and reassembly process.
### 1. Safety Precautions
– Disconnect the battery to prevent any electrical shorts or issues during the repair.
– Wear safety gear such as gloves and goggles to protect yourself.
This reverse order provides an outline of the shift drum repair process for a BMW 740i/740iL. Always refer to a specific service manual for detailed instructions
and torque specifications tailored to your vehicle.
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