Emilie Meyer
If you own a 1999 BMW 528i and are looking to change the transmission pan gasket, there are a few steps you can follow. Firstly, it is important to gather the necessary tools, which may include torque sockets. Then, underneath the car, remove the splash guard and disconnect the sway bar, control arms, thrust arms, and steering rack from the subframe. Next, remove the bolts holding the subframe and slowly lower it with a transmission jack. Once you have removed the oil pan, replace the gasket, and then reverse the procedure, ensuring that the bolts for the control and thrust arms are tightened properly when the vehicle is resting on its wheels.
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What You'll Learn
Disconnect the sway bar and control arms
Disconnecting the sway bar and control arms on a 1999 BMW 528i is a necessary step when changing the transmission pan gasket. Here is a detailed guide on how to do this:
Firstly, access the underside of the car. This can be done by lifting the vehicle safely using a jack and supporting it with jack stands, or driving the car onto ramps. Once underneath, locate the sway bar and control arms. The sway bar is a thin, metal bar that connects the two sides of the suspension, while the control arms are the larger, sturdy arms that connect the wheels to the car's chassis.
To disconnect the sway bar, you will need to locate the bolts that attach it to the subframe. There should be two bolts, one on each side. Using the appropriate size socket or wrench, loosen and remove these bolts. With the bolts removed, the sway bar can be carefully lifted and set aside.
Now, move on to the control arms. These are typically attached to the subframe with bolts or ball joints. If your vehicle uses bolts, simply loosen and remove them. If your vehicle uses ball joints, you may need to use a ball joint separator tool to carefully detach the control arms. With the control arms disconnected, tie them up and away from the suspension to ensure they do not strain or damage any components.
At this stage, it is crucial to note that the weight of the vehicle is now solely supported by the jack stands or ramps. Ensure these are properly positioned and stable before continuing. With the sway bar and control arms disconnected, you will have better access to the transmission pan and the gasket you need to replace. Remember to refer to a qualified mechanic or a professional repair manual for further guidance if needed.
Finally, when it comes to reassembling the components, it is important to tighten the bolts for the control arms and thrust arms hand-tight initially. Do not tighten them to their proper torque until the vehicle is back on its wheels and the suspension is under load. This is an important step to ensure the safety and stability of your BMW 528i.
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Remove the subframe
To remove the subframe of a 1999 BMW 528i when changing the trans pan gasket, you will need to follow these steps:
Firstly, you must gain access to the subframe by removing the splash guard underneath the car and disconnecting the sway bar from the subframe. Next, disconnect the control arms, thrust arms, and steering rack.
Once you have clear access to the subframe, you will need to remove the bolts holding it in place. There are three 19mm bolts on each side. After removing these bolts, you can slowly lower the subframe with a transmission jack. Take caution to lower it only a few inches.
At this point, you should be able to access the oil pan and proceed with replacing the gasket. Remember to reverse the procedure when reassembling, ensuring that you do not tighten the bolts for the control and thrust arms to proper torque until the vehicle is resting on its wheels.
It is important to note that some sources suggest that it may be possible to replace the gasket without removing the subframe. However, this is considered a challenging task, as accessing all the bolts can be difficult without lowering the subframe or raising the engine.
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Remove the oil pan
To remove the oil pan from a 1999 BMW 528i, you will need to follow a few important steps. Firstly, it is recommended to use an engine brace to support the engine while you work. Begin by removing the top nut on the motor mounts and putting the engine brace in place.
Now, you can move to the underside of the car. Remove the splash guard and disconnect the sway bar from the subframe. Disconnect the control arms, thrust arms, and the steering rack. With these disconnected, you can now remove the 3 19mm bolts on each side that are holding the subframe in place.
Lower the subframe slowly with a transmission jack. You can now remove the oil pan. Take care to replace the gasket and then reverse the procedure to reassemble the components.
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Replace the gasket
To replace the gasket, start by removing the splash guard from underneath the car. Next, disconnect the sway bar from the subframe, followed by the control arms, thrust arms, and steering rack. Remove the three 19mm bolts on each side holding the subframe in place. Now, slowly lower the subframe down a few inches with a transmission jack.
With the subframe lowered, you can access the oil pan. Remove the oil pan and replace the gasket. Once the new gasket is in place, simply reverse the procedure to reassemble everything. Remember, when reinstalling the bolts for the control arms and thrust arms, tighten them by hand first. Do not tighten them to the proper torque until the vehicle is back on its wheels and the suspension is under load.
If you are working on a garage floor, a helpful trick is to lower the car onto wood or cinder blocks, one under each tire. Then, reach under and tighten the two bolts on each side (one for the control arm and one for the thrust arm). After this, lift the car again to remove the blocks, and you're almost done!
It is worth noting that some BMW technicians choose to replace the entire oil pan, especially if it is made of plastic. However, this is not always necessary unless there is significant corrosion that has compromised the sealing surface.
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Reinstall the bolts
When reinstalling the bolts, it is important to follow the correct procedure to ensure the safety and proper functioning of your BMW 528i. Here is a detailed guide to assist you in this process:
Firstly, it is crucial to understand that the bolts for the control arms and thrust arms should be reinstalled hand-tight. This means tightening them by hand until they are snug, but not using any tools to apply additional torque. This is an important precaution to avoid over-tightening, which can cause damage to the threads or the bolts themselves.
Once the bolts for the control arms and thrust arms are hand-tightened, the vehicle should be lowered onto a secure and stable surface. It is recommended to use wood blocks or cinder blocks under each tire to support the car. This step is essential because the bolts need to be tightened with the suspension under load.
After the car is securely lowered onto the blocks, you can proceed to tighten the bolts with the appropriate torque. Reach under the vehicle and locate the bolts for the control arms and thrust arms. Using the correct size torque wrench, tighten these bolts to the specified torque value for your BMW 528i. Refer to the vehicle's service manual or a trusted online resource for the exact torque specifications.
Once all the bolts are properly tightened, you can remove the wood or cinder blocks from under the tires. Lift the vehicle again to access the blocks and carefully remove them one by one. Ensure that the vehicle is securely supported by jack stands or ramps before removing each block.
Finally, with the vehicle safely lowered back to the ground, perform a thorough inspection of the bolts and other components. Ensure that all bolts are securely tightened and that there are no leaks or signs of damage. Test-drive the vehicle on a level surface and monitor for any unusual noises or vibrations that may indicate a problem.
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