Regan Brown
Flushing an automatic transmission with diesel fuel is a fairly simple procedure. It involves draining the waste oil, changing the filter, washing the system with diesel fuel, and then pouring in new oil. While some people recommend using diesel fuel to flush transmissions, others advise against it, as transmission fluid already has a fluid package that includes cleaners. Instead, it is recommended to use products specifically designed for flushing transmissions, such as those from WYNN's, BG, or Sea Foam.
| Characteristics | Values |
|---|---|
| Flushing an automatic transmission with diesel fuel | Not recommended |
| Alternative methods | Use flushing oil or a product designed to flush engines, such as AMSOIL Engine & Transmission Flush |
| Flushing procedure | Drain the remaining oil, replace the oil filter, and use a special flushing apparatus |
| Notes on flushing procedure | The procedure should be done on a "pit" or a lift, and the oil should be allowed to completely pass through the system for several circles |
| Benefits of flushing transmission | Keep the transmission in working order and reduce the need for expensive repairs |
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What You'll Learn
Flushing the valve body
To flush the valve body of an automatic transmission with diesel fuel, you need to follow a few important steps. Firstly, it is recommended to perform the flush on a "
The first step is to drain the old oil. Place a container beneath the transmission pan and unscrew the pan to allow the oil to drain out. This step may require some time to ensure the oil drains completely. Once drained, replace the oil filter; it is good practice to inspect the old filter to identify any potential issues.
The next step is to prepare the diesel fuel for flushing. Attach the flushing apparatus to the cooling system, following the manufacturer's instructions. Ensure the pipes are connected securely to the automatic transmission cooling system pipes. Start the engine and allow it to run for a short time with the flushing apparatus connected. The diesel fuel will circulate through the transmission, cleaning the various components, including the valve body.
After turning off the engine, carefully unscrew and remove the sump to drain the diesel fuel and any remaining old oil. This mixture will contain solid particles and dirt, so be cautious when handling it. Finally, refill the transmission with new oil, ensuring you use the correct type and amount as per the vehicle manufacturer's specifications.
It is important to note that while diesel fuel can be used for flushing, it is not recommended by some sources due to the presence of cleaners in transmission fluid. There are dedicated flushing products available, such as AMSOIL Engine & Transmission Flush, which are designed to effectively clean and restore fuel economy. These products can be purchased from auto dealers or parts stores, offering a more specialized approach to flushing the valve body of an automatic transmission.
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Using a special flushing apparatus
To flush an automatic transmission using a special flushing apparatus, you will need to follow these steps:
Firstly, it is best to perform this operation with the vehicle on a lift or a pit, as you will need to unscrew the pan to drain the remaining oil. Then, you will need to acquire a special flushing apparatus, which is available at most service stations. The flushing apparatus will have pipes that need to be connected to the automatic transmission cooling system.
Secondly, start the engine and let it run for a few minutes at idle. This will allow the oil to heat up. Once the oil is heated, carefully remove the pan and drain the used oil. It is important to note that this oil will contain solid particles of metal and dirt, so be cautious when handling it.
Thirdly, install a new oil filter. Before installing the new filter, it is advisable to perform a visual inspection to ensure it is in good condition. Additionally, when installing the new filter, remember to replace its gasket and use sealant to secure it in place.
Lastly, with the flushing apparatus still connected, pour fresh oil through a special pipe. Start the engine again and let the lubricant run through the system several times, flowing out through a hose on the flushing apparatus. The flushing process is complete when the volume of oil flowing out is equal to the volume of oil you poured in.
After the flush, it is important to check the automatic transmission for any unusual noises and ensure that gear shifting is smooth and easy.
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The full-flow method
The first step is to purchase twice the amount of oil for the box. Automatic transmissions are usually filled with Dexron or ATF oils, which are quite expensive. It is important to carefully read the instructions, as different types and colours of grease cannot be mixed.
The next step is to drain the remaining oil from the transmission. This is typically done by unscrewing the pan. After the oil has been drained, a special flushing apparatus is connected to the pipes of the automatic transmission cooling system. The engine is then started and allowed to run for a while.
Once the engine is turned off, the oil flows into the sump, which must be carefully unscrewed to drain the oil and remove any solid particles of metal and dirt. It is recommended to replace the filter and perform a visual inspection before reinstalling it.
During the flushing process, it is important to switch between different gears to ensure that the oil flows through different channels and cleans all gears and transmission elements. After flushing, the box should be checked for any unusual noises and gear shifting should be tested to ensure smooth and easy movement of the selector.
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Using a detergent-based formula
While some people use diesel fuel to flush their automatic transmissions, it is not recommended. Trans fluid already has a fluid package that includes cleaners, and there are other products designed specifically for flushing transmissions.
If you are looking for a detergent-based formula to flush your automatic transmission, you can try AMSOIL Engine & Transmission Flush. This product is designed to flush engines and transmissions in passenger cars and light trucks, motorcycles, ATV/UTVs, snowmobiles, marine vehicles, and heavy-duty vehicles. Its detergent-based formula effectively cleans sludge and deposit buildup, helping to restore fuel economy, increase operating efficiency, and reduce emissions.
AMSOIL Engine & Transmission Flush is a potent formula that can be used in both gasoline and diesel engines, as well as automatic transmissions. It is recommended for those who want effective sludge removal and cleaning power. This product is safe to use and will not damage your transmission.
To use a detergent-based formula like AMSOIL Engine & Transmission Flush, follow the instructions on the product packaging. In general, the process of flushing an automatic transmission involves draining the waste oil, changing the filter, washing the transmission, and pouring in new oil. This is known as a full-flow method. It is best to perform this task on a "pit" or a lift so that you can easily access the transmission. You will need to unscrew the pan to drain the remaining oil and replace the oil filter.
It is important to note that, while flushing your automatic transmission can help maintain its condition and reduce the need for expensive repairs, it should be done at the recommended intervals specified by the manufacturer. Regular maintenance, such as oil changes and filter replacements, is also crucial to keep your transmission in good working order.
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Flushing vs. changing the filter
Flushing an automatic transmission with diesel fuel is not recommended. Trans fluid already has a fluid package that includes cleaners. Flushing the transmission with diesel fuel can be done, but it is an old trick to desludge engine oil. If you are going to flush the transmission, you should look into products from WYNN's, BG, or Sea Foam.
The cost of a transmission fluid change will vary depending on vehicle size, who performs the service, and the cost of the filter and gasket. For example, performing a transmission fluid change on a small vehicle yourself may cost $50-$75, while paying a dealership to perform the same service on a heavy-duty truck may cost $200-$300.
A transmission flush will also vary in cost depending on similar factors, such as vehicle size and where the service is performed. A transmission flush for a small car may cost around $250, while a larger vehicle may cost over $400.
A pan-drop is an alternative to a transmission flush that reduces the risk associated with flushing old, dirty fluid through the transmission. However, a pan-drop only removes about a third of the fluid, reducing the performance of the new fluid. It is also time-consuming and can be messy.
Performing a transmission flush helps to clean the transmission of sludge and other contaminants that can accumulate in the fluid due to extreme heat. These contaminants can circulate throughout the transmission and lodge in the narrow fluid passages inside the valve body, leading to poor shift quality. A flush allows for the use of a flush additive to help clean the transmission and more effectively remove accumulated sludge. However, some people warn against performing a flush with old, dirty fluid as it may increase the risk of dislodging debris.
In summary, the decision between flushing and changing the filter depends on factors such as cost, vehicle size, and the condition of the transmission fluid. A transmission flush is generally more expensive but can provide a more thorough cleaning of the transmission. Changing the filter may be a more cost-effective option, but it may not remove all the contaminants from the transmission.
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Frequently asked questions
Yes, you can flush an automatic transmission with diesel fuel. However, it is recommended to use a product specifically designed to flush transmissions, such as AMSOIL Engine & Transmission Flush.
To flush an automatic transmission with diesel fuel, you need to first drain the waste oil from the box, change the filter, wash the box, and then pour in new oil. This process is known as a full-flow flush.
Yes, there are alternative products available on the market specifically designed for flushing transmissions, such as those offered by WYNN's, BG, and Sea Foam.
The frequency of flushing your automatic transmission depends on various factors, including the type of transmission and fluid used. It is recommended to follow the manufacturer's specifications for flushing intervals. Additionally, regular maintenance and inspections can help identify when a flush may be necessary.
