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I’m Marielle, your friendly neighborhood mechanic, and today we’re going to delve deep into the intricate process of replacing the valve body on a BMW 735i or 735iL. The valve body is a critical component of the automatic transmission, acting as the control center for the hydraulic system that governs the shifting of gears. Replacing it is a task that requires patience, precision, and a good understanding of automotive mechanics. So, let’s roll up our sleeves and get started!
### Tools and equipment Needed:
Before we jump into the replacement process, let me list the tools and equipment you will need. Having everything organized and ready will make the job smoother and more efficient.
1. **Socket Set**: A comprehensive metric socket set, including 10mm, 12mm, and 14mm sockets, to remove various bolts and fasteners.
2. **Ratchet**: A ratchet wrench compatible with your socket set to easily turn the sockets.
3. **Torque Wrench**: To ensure that all bolts are tightened to the manufacturer’s specified torque settings.
4. **Flathead and Phillips Screwdrivers**: For removing clips and securing any electrical connectors.
5. **Pliers**: Needle-nose pliers are particularly useful for handling small clips and connectors.
6. **Transmission Fluid**: You’ll want to have some fresh ATF (Automatic transmission Fluid) on hand for refilling the transmission after the valve body replacement.
7. **Drain Pan**: To catch any leaking transmission fluid during the removal of the valve body.
8. **Gasket Scraper**: For cleaning the mounting surface where the new valve body will be installed.
9. **Shop Towels**: To keep everything clean and to wipe off any excess fluid.
10. **Safety Glasses and Gloves**: Always protect yourself while working!
### Step-by-Step Procedure for Valve Body Replacement:
#### Step 1: Preparation
1. **Safety First**: Ensure the vehicle is parked on a flat surface and the ignition is turned off. Engage the parking brake to prevent any movement.
2. **Disconnect the Battery**: Use a 10mm socket to disconnect the negative terminal of the battery. This step is crucial to prevent any electrical shorts or issues while working on the vehicle.
#### Step 2: Drain the transmission Fluid
1. **Locate the transmission Pan**: Crawl under the vehicle and find the transmission pan, which is typically a large, metal pan located on the underside of the transmission.
2. **Position the Drain Pan**: Place your drain pan under the transmission pan to catch the old fluid.
3. **Remove the Drain Plug** (if equipped): Use the appropriate socket to remove the drain plug. If there’s no drain plug, you’ll have to remove the transmission pan bolts, allowing fluid to spill out. Be prepared for a mess!
4. **Allow Fluid to Drain**: Let the transmission fluid drain completely into your drain pan.
#### Step 3: Remove the transmission Pan
1. **Remove Pan Bolts**: Using your socket set, remove the bolts securing the transmission pan. Keep these bolts organized as you will need them for reinstallation.
2. **Gently Pry the Pan Loose**: Use a flathead screwdriver or gasket scraper to separate the transmission pan from the transmission. Be cautious not to damage the mating surface.
3. **Take Off the transmission Pan**: Once loose, carefully lower the pan and allow any remaining fluid to drain into the pan.
#### Step 4: Remove the Valve Body
1. **Locate the Valve Body**: The valve body sits directly beneath the transmission pan and is a large metal component with multiple channels and passages.
2. **Disconnect Electrical Connectors**: Carefully disconnect any electrical connectors attached to the valve body using your pliers or a screwdriver, depending on the type of connector.
3. **Remove Valve Body Bolts**: Using your socket set, remove the bolts that secure the valve body to the transmission. Again, keep these bolts organized.
4. **Carefully Lift Out the Valve Body**: Once all bolts are removed, gently lift the valve body out of the transmission. Be cautious of any remaining fluid and ensure you’re not damaging any internal components.
#### Step 5: Prepare for the New Valve Body
1. **Clean the Mounting Surface**: Use your gasket scraper to clean the mating surface on the transmission where the valve body will sit. Be meticulous here to ensure a proper seal.
2. **Inspect the Old Valve Body**: Before disposing of the old valve body, inspect it for any signs of damage or wear. This can provide valuable insight into the issues you were experiencing with the transmission.
#### Step 6: Install the New Valve Body
1. **Position the New Valve Body**: Carefully align the new valve body with the transmission, making sure to guide any electrical connectors or harnesses into place.
2. **Secure the Valve Body**: Using your socket set, begin tightening the bolts that secure the valve body. Follow a crisscross pattern to ensure even pressure
and avoid warping. Refer to the manufacturer’s specifications for the correct torque settings.
3. **Reconnect Electrical Connectors**: Make sure all electrical connectors are securely attached to the new valve body.
#### Step 7: Reinstall the transmission Pan
1. **Clean the transmission Pan**: Ensure that the transmission pan is clean, removing any old gasket material.
2. **Apply New Gasket Material**: If your transmission pan requires a gasket, install it according to the manufacturer’s instructions. If using RTV silicone, apply it evenly around the perimeter of the pan.
3. **Position the Pan**: Align the pan back onto the transmission and start threading the bolts in by hand to avoid cross-threading.
4. **Tighten the Bolts**: Using the torque wrench, tighten the pan bolts to the specified torque settings.
#### Step 8: Refill transmission Fluid
1. **Locate the transmission Dipstick Tube**: This is where you will add new transmission fluid. It’s typically located near the back of the engine bay.
2. **Add New Fluid**: Using a funnel, pour the new ATF into the dipstick tube. Start with the manufacturer’s recommended amount and check the level.
3. **Check Fluid Level**: After adding the fluid, start the engine and allow it to idle for a few minutes. While idling, cycle through the gears (P, R, N, D) to help circulate the fluid. Check the transmission dipstick and add more fluid if necessary, ensuring it’s at the correct level.
#### Step 9: Reconnect the Battery and Test Drive
1. **Reconnect the Battery**: Using your 10mm socket, reconnect the negative terminal of the battery.
2. **Test Drive**: Take the vehicle for a short test drive to ensure that the transmission is shifting smoothly and that there are no leaks from the transmission pan or valve body area.
### Conclusion
And there you have it! You’ve successfully replaced the valve body on a BMW 735i or 735iL. Remember, while this process can be intricate and demanding, it’s also incredibly rewarding. Always take your time, double-check your work, and consult a repair manual for specifics related to your vehicle model. Happy wrenching! If you have any questions, feel free to ask!
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