Ella Walter
The BMW E90 is known for oil leaks, and the oil pan gasket is a common culprit. If you're planning to drop the engine pan on your E90, it's likely because you need to replace the oil pan gasket. This is a complex DIY task that requires jacking up the car, draining the oil, removing various components, and lowering the subframe. Before you begin, make sure you have the necessary tools and safety equipment, and follow online guides and forums for detailed step-by-step instructions.
Characteristics and Values Table for Dropping an E90 Engine Pan
| Characteristics | Values |
|---|---|
| Engine | BMW E90 328i or 335i |
| Cause for dropping the pan | Oil stains in the garage, oil pan gasket, oil filter housing gasket, or valve cover gasket leaking |
| Steps to drop the pan | 1. Jack up the car and support it with stands. 2. Loosen the drain plug and drain the oil. 3. Lower the subframe. 4. Disconnect wires and hoses. 5. Remove oil pan bolts and oil return tube. 6. Remove the oil pan. |
| Additional considerations | Ensure the engine is not started if there are any fragments in the oil pan. Use a mirror, camera, or boroscope to inspect the pan. |
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What You'll Learn
Jack up the car and support it with stands
Jacking up your car and supporting it with stands is an important step when working underneath your vehicle, especially when dropping the oil pan on your E90. Here is a detailed guide on how to do this safely and effectively:
First, you will need to position the car jack in the correct location to lift the vehicle. Consult your car's user manual to identify the recommended jacking points and ensure you place the jack in the proper location. Once the jack is in position, slowly raise the vehicle to the desired height. Ensure that the car is stable and securely resting on the jack before proceeding.
Next, you will need to position the jack stands to support the vehicle. Place the jack stands on a level surface, on either side of the vehicle, at the recommended support points. These support points can usually be found in the user manual. Slowly lower the vehicle onto the stands by carefully adjusting the jack. Ensure that the vehicle is securely resting on the stands and cannot shift or move when you work underneath it.
Once the car is securely supported by the jack stands, you can proceed to work underneath the vehicle. It is important to always exercise caution when working under a raised vehicle. Ensure that the stands are stable and cannot shift or move during this process. If you need to adjust the height or position of the vehicle, make sure to follow the same procedure as before, using the jack to lift the vehicle and then adjusting the stands as needed.
When you have completed the necessary work underneath the vehicle, you can lower the car by reversing the process. Carefully jack up the vehicle to take the weight off the stands, and then remove the stands one by one, ensuring the car remains stable on the jack. Once the stands are removed, slowly lower the vehicle to the ground by gradually lowering the jack.
By following these steps, you can safely jack up your car and support it with stands, providing you with the necessary access to drop the engine pan on your E90. Remember always to exercise caution and consult a professional mechanic if you are unsure about any aspect of the process.
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Loosen the drain plug and drain the oil
To loosen the drain plug and drain the oil, follow these steps:
First, jack up the car and support it securely with stands at the front and rear, leaving enough space to work underneath. Next, locate the drain plug and use a 17mm socket to loosen it. Allow ample time for the oil to drain completely and avoid rushing this step to prevent oil dripping onto you while you work.
After draining the oil, it is essential to sift through it to check for any debris or belt material. If any foreign objects are present, they must be removed, and the oil pan must be cleaned thoroughly. This step is crucial to prevent damage to the engine caused by contaminants.
Once the oil has been drained and inspected, continue with the process of dropping the E90 engine pan. This may involve partially or fully dropping the subframe, depending on your specific model and the accessibility of the bolts. Ensure you follow the necessary safety precautions and refer to model-specific instructions for dropping the engine pan.
Remember to place a drain pan under the engine to catch any residual oil drips during the pan removal process.
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Lower the subframe
Lowering the subframe of an E90 vehicle requires careful preparation and execution. Here is a step-by-step guide to help you through the process:
Before beginning, ensure you have the necessary tools and equipment. It is also recommended to refer to detailed DIY videos and guides specific to your vehicle model to ensure you have the correct steps and techniques.
First, loosen the lower control arms. This will allow you to drop the subframe enough to access and replace the oil pan. If you are planning to work on the motor mounts as well, you can leave them bolted in place and simply unbolt them from underneath, allowing the subframe to drop without them. Just remember to unbolt and detach the steering shaft before lowering the subframe.
Next, you will need to support the engine securely. This can be done by using an engine hoist or jack to lift and support the engine from above. Ensure that the engine is stable and cannot move or shift during the process.
Now, you can begin to lower the subframe. This process may vary slightly depending on your specific vehicle model, but it typically involves unbolting the subframe from the vehicle's chassis. Carefully lower the subframe, ensuring that it does not come into contact with any other components or cause any damage.
Once the subframe is lowered, you will have access to the oil pan and other components for maintenance or replacement. Remember to work carefully and methodically, taking note of any bolts or components that need to be replaced or upgraded.
Finally, when you have completed the necessary work on the oil pan and other accessible components, you can begin to reassemble the subframe. Ensure that all bolts are tightened securely and that all components are properly aligned and connected.
Remember that this process can be time-consuming and challenging, especially if you are working alone. It is always helpful to have an extra pair of hands to assist you, especially if you are doing this for the first time.
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Disconnect the plug and ground wire for the oil level sensor
To disconnect the plug and ground wire for the oil level sensor, you must first remove the engine oil drain plug and allow the engine oil to drain into a container. If you plan to reuse the engine oil, ensure that the container is clean and free of debris. Once the oil is fully drained, reinstall the engine oil drain plug and tighten it. Clean the area around the oil condition sensor thoroughly.
Working at the oil condition sensor, disconnect the electrical connector. There is a grounding strap attached to a bracket. You can leave this attached and let it hang when removing the oil condition sensor. However, if you want to remove and clean the bracket, you will need to disconnect the ground.
Once the sensor has been removed from the oil pan, clean the oil level sensor mounting area thoroughly. After cleaning, you can install a new oil level sensor. Apply a small amount of new engine oil to the oil condition sensor seal. Tighten the three 10mm nuts and reconnect the electrical connector.
Fill the engine with oil and start it, allowing it to run for about a minute. Then, inspect the oil level sensor for leaks. Once you are sure no leaks are present, reinstall the plastic splash shields.
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Remove the oil pan bolts
To remove the oil pan bolts, you must first jack up the car and support it safely with stands at the front and rear, leaving enough space to work underneath. Next, loosen the drain plug with a 17mm socket and drain the oil.
Now, you can slowly lower the subframe until the jack falls away. The engine support brace and suspension struts will now be supporting the car. Disconnect the plug and ground wire for the oil level sensor. On the driver's side, remove the bracket protecting the fuel and brake lines.
Unbolt the power steering hose on the passenger side front of the subframe. This will allow it to move for the oil pan. Unclip the A/C pipe from the front of the engine. Now, you can remove the oil pan bolts with an e-torx socket.
It is important to note that you may need to fully or partially drop the subframe, depending on your model. For RWD models, you can get away with partially dropping the subframe just enough to get clearance for the bolts. For Xdrive models, you will need to fully drop the subframe as the front differential passes through the pan and is bolted to it.
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Frequently asked questions
To drop an E90 engine pan, you must first jack up the car and support it with stands at the front and rear, leaving enough space to work underneath. Next, loosen the drain plug and drain the oil. Then, slowly lower the subframe and remove the oil pan bolts. Finally, remove the oil pan and place a drain pan underneath to catch any remaining oil.
To remove the oil pan bolts, use an e-torx socket. Be careful not to break the tube from the oil pan for the oil return line. Use pliers to squeeze and unlock two sides, and a mini flathead screwdriver to unlock the other two.
After removing the oil pan, clean it and the engine block using a scraper and parts cleaner. Then, remove the oil level sensor and replace the o-ring gasket. Reinstall the sensor into the oil pan, using zip ties to hold the gasket in place.
