Replacing the transmission pump on a BMW 750iL E38 is a complex task that requires a good understanding of automotive mechanics, especially with BMW’s specific systems. click here for more details on the download manual…..

DIY : Change the radiator on the BMW E38 This video show how to change the radiator on the BMW E38 Link for bleeding …

BMW 750il e32 with straight exhaust pipes and oem muffler sound 6 speed manual.

Below is a detailed guide, but please note that this is a high-level overview. Always refer to a service manual specific to your model for precise specifications and procedures.

### Tools and Materials Needed:
1. **Tools:**
– Socket set (metric)
– Torque wrench
– Screwdriver set
– Pliers
– Transmission fluid pump
– Oil catch pan
– Clean rags
– Gasket scraper
– Prying tools
– Jack and jack stands

2. **Materials:**
– New transmission pump (OEM recommended)
– New transmission fluid (ATF, consult your manual for the type)
– New gaskets and seals (if applicable)
– Cleaning solvent or degreaser

### Safety Precautions:
– Ensure the vehicle is on a level surface.
– Disconnect the battery to avoid any electrical short circuits.
– Use gloves and safety glasses when working.

### Step-by-Step Procedure:

#### Step 1: Preparation
1. **Disconnect the Battery:**
– Remove the negative terminal of the battery to prevent any electrical issues.

2. **Lift the Vehicle:**
– Use a jack to lift the front of the vehicle and secure it with jack stands. Ensure that the vehicle is stable before working underneath it.

3. **Drain Transmission Fluid:**
– Place an oil catch pan under the transmission.
– Remove the transmission pan bolts and carefully take off the pan. Let the fluid drain completely.

#### Step 2: Accessing the Transmission Pump
1. **Remove the Transmission Pan:**
– After draining the fluid, remove the transmission pan completely to access the internal components.

2. **Remove the Valve Body:**
– Disconnect any electrical connectors and linkages attached to the valve body.
– Remove the bolts securing the valve body in place and carefully take it out. Be cautious of the gasket and seals.

3. **Remove the Torque Converter:**
– Depending on the model, you may need to remove the torque converter bolts. Rotate the engine as necessary to access all bolts.

4. **Remove the Transmission Housing:**
– You may need to unbolt parts connected to the transmission housing, including the starter motor if applicable. Remove any brackets or supports to give you space to work.

#### Step 3: Removing the Old Pump
1. **Locate the Transmission Pump:**
– The transmission pump is typically located inside the transmission housing.

2. **Remove the Pump Bolts:**
– Carefully unbolt the pump from the transmission. Keep track of the bolts as you will need them for the new pump.

3. **Remove the Old Pump:**
– Gently pry the old pump from its housing. Be cautious not to damage any surrounding components during this process.

#### Step 4: Installing the New Pump
1. **Prepare the New Pump:**
– Clean the mating surfaces on the transmission housing where the new pump will be installed.

2. **Install New Gaskets:**
– If applicable, install new gaskets or seals onto the new pump.

3. **Position the New Pump:**
– Place the new pump into the transmission housing, ensuring it is seated correctly.

4. **Secure the Pump:**
– Reinstall the bolts that secure the pump, tightening them to the manufacturer’s specifications using a torque wrench.

#### Step 5: Reassembly
1. **Reinstall the Valve Body:**
– Reattach the valve body, ensuring all electrical connectors and linkages are properly connected.

2. **Reattach the Torque Converter:**
– If removed, reinstall the torque converter and secure it with bolts.

3. **Reinstall the Transmission Pan:**
– Clean the transmission pan and install the new gasket if required. Reattach the pan using the appropriate bolts and torque specifications.

4. **Reconnect Everything:**
– Reinstall any brackets, supports, and components that were removed during disassembly.

#### Step 6: Refilling Transmission Fluid
1. **Refill Transmission Fluid:**
– Use the appropriate transmission fluid recommended for the BMW 750iL E38.

2. **Check fluid Levels:**
– Start the engine and let it idle, cycling through the gears to ensure the transmission is filled properly. Check the fluid level and top up as necessary.

#### Step 7: Testing
1. **Test Drive:**
– Take the vehicle for a test drive to ensure the transmission operates smoothly and without leaks.

2. **Check for Leaks:**
– After the test drive, recheck under the vehicle for any signs of leaking fluid and rectify as necessary.

### Conclusion
Replacing the transmission pump on a BMW 750iL E38 requires meticulous attention to detail and patience. Make sure to have all necessary tools and parts ready before starting the job. If you’re not comfortable performing this replacement, it’s highly recommended to consult a professional mechanic. Always refer to the vehicle’s service manual for specific details and torque specifications.
The headlight relay is a crucial component in a vehicle’s electrical system, specifically designed to control the operation of the headlights. Its primary function is to act as an intermediary switch that allows a small amount of current from the headlight switch to control a larger amount of current that powers the headlights. This design is essential for several reasons.

Firstly, the headlight relay helps to reduce the load on the headlight switch. When a driver turns on the headlights, the switch would normally have to handle the full electrical load required to power the lights. By using a relay, only a small current flows through the switch, which significantly reduces the risk of overheating and prolongs the lifespan of the switch.

Secondly, the relay improves the overall efficiency of the headlight system. When the relay is activated, it allows a more direct and robust flow of current from the battery to the headlights, resulting in brighter illumination. This is particularly important in modern vehicles where higher wattage bulbs are used for enhanced visibility.

Moreover, the headlight relay provides a layer of protection for the vehicle’s electrical system. It can act as a fuse, preventing damage to the headlight circuit in the event of a short circuit or malfunction.

In summary, the headlight relay is an essential component that enhances the safety, efficiency, and durability of a vehicle’s lighting system, ensuring that drivers maintain optimal visibility on the road.