Marianne Martinez
Metal shavings in transmission pans are a common issue for car owners, and it is important to determine the root cause to prevent further damage. While some amount of metal grit in automatic transmission pans is normal, larger chunks or a burnt smell could indicate a serious problem. In this discussion, we will explore the potential causes of metal shavings, the steps to identify abnormal levels, and the necessary actions to take to ensure the safe and efficient operation of your vehicle.
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What You'll Learn
- Metal shavings are normal in automatic transmission pans, but only on the magnet
- If the shavings are chunky or smell burnt, there's an issue
- Gold flecks in the fluid could be brass bearings
- Fine, silver shavings could be aluminium
- If there are no issues with driving, some suggest cleaning the pan, changing the filter and adding new fluid
Metal shavings are normal in automatic transmission pans, but only on the magnet
It is not uncommon to find metal shavings in automatic transmission pans, but this should only be on the magnet. The presence of metal shavings in the transmission fluid could indicate an issue with the torque converter, which may need to be replaced or rebuilt.
Some mechanics suggest that a certain amount of metal shavings is normal, especially in older cars with high mileage. However, others argue that any amount of metal shavings is abnormal and could indicate a problem. If the fluid is gritty, chunky, or smells burnt, it is likely an issue.
In some cases, the metal shavings may be aluminium, which is non-magnetic. This could be due to rotating parts rubbing against the case or mismatched, non-compatible parts. It is important to regularly service your vehicle and change the transmission fluid to prevent issues.
If you notice metal shavings in your transmission pan, it is important to have it inspected by a professional mechanic to determine the cause and ensure the safe operation of your vehicle.
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If the shavings are chunky or smell burnt, there's an issue
It is not uncommon for automatic transmission pans to have metal shavings, but this should only be on the magnet within the pan. If the shavings are "chunky" or smell burnt, this could indicate an issue with the transmission. In this case, it is recommended to take the vehicle to a mechanic for further inspection and possible repairs.
The texture of the fluid in the transmission pan can also be indicative of potential problems. If the fluid is thick with metal bits, it could be preventing slipping and keeping the vehicle running. However, it is not advisable to perform a full flush in this case. Instead, it is suggested to replace the filter and add new fluid to the pan.
It is important to note that the presence of metal shavings in the transmission pan can vary depending on the transmission type and the manufacturer. In some cases, a high amount of grit or metal shavings may be considered normal, while others may indicate a more severe problem.
If you are concerned about the amount or nature of the metal shavings in your transmission pan, it is always best to consult a professional mechanic. They will be able to assess the specific circumstances of your vehicle and advise on the appropriate course of action.
Additionally, providing detailed information about your vehicle, such as the year, make, model, mileage, engine size, and transmission type, will help mechanics offer more tailored advice and guidance.
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Gold flecks in the fluid could be brass bearings
Metal shavings in automatic transmission pans are usually indicative of engine wear, where moving parts like bearings and crankshafts chip off small metal particles over time. These particles can also be caused by the breakdown of bi-metal or tri-metal structures in bearings. While some metal shavings are normal, especially in newer engines, an excessive amount or newly discovered shavings in older engines may indicate damage.
Now, regarding the presence of gold flecks or brass particles in transmission fluid, there are a few potential causes. Brass is commonly used in synchro rings in car transmissions, so the brass flecks could be normal wear particles from the synchros. This is especially likely if the transmission is older and the fluid has not been changed regularly. Additionally, older GL-5-based gear lubes with sulfur additives could attack the brass synchros and result in brass flakes upon draining.
In some cases, the gold flecks may not be brass at all. It is possible that they are hard plastic particles, such as those from the primary chain tensioner shoe, which can resemble brass. To distinguish between brass and plastic, one can try squeezing the particles, as brass would not break apart under pressure.
If the gold flecks are indeed brass, then the presence of these particles in the transmission fluid could indicate potential issues with the bearings. Brass is often used as a low-friction surface material in engine bearings, bonded to a steel backing. If the brass layer is wearing off, it could expose the steel backing, leading to potential damage to the crankshaft journals and bearings. Therefore, while some brass particles may be normal, especially with certain types of transmission fluid, an excessive amount or the presence of larger chips could signal a problem.
To summarize, gold flecks in the transmission fluid could be brass particles from normal wear, especially in older transmissions or those using certain types of fluid. However, if the amount of flecks is excessive or if larger chips are present, it may indicate an issue with the bearings or other components. Regular maintenance, such as changing the fluid and oil filter, can help reduce the risk of brass flake buildup and potential engine damage.
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Fine, silver shavings could be aluminium
It is not uncommon to find metal shavings in automatic transmission pans, and these shavings are usually found on the magnet within the pan. However, it is important to note that the presence of metal shavings could indicate a problem, especially if they are "chunky" or smell burnt. While it is normal to have some grit in the bottom of the pan, the ideal situation is to have none.
Now, when it comes to the fine, silver shavings, there is a possibility that they could be aluminium. Aluminium is a silvery-gray metal with desirable characteristics such as being light, non-magnetic, and non-sparking. It is the third most abundant element in the Earth's crust and is widely used in industrial applications.
In the context of automotive transmission pans, aluminium shavings could be present due to the use of aluminium components or the wear and tear of aluminium parts within the transmission system. These shavings may be attracted to the magnet in the pan, along with other metal particles, which can help to identify any potential issues.
It is worth noting that aluminium is often used in automotive applications because of its strength, lightness, and ease of construction. However, the presence of aluminium shavings in the transmission pan may indicate wear on certain components, and it is always advisable to consult a professional mechanic for inspection and advice.
Additionally, if you are working with aluminium or other metals and find yourself with fine, silver shavings on your skin, it is important to take precautions to remove them safely. While some sources suggest using a pore vacuum or a black clay mask, it is always best to consult a medical professional for advice on safely removing metal shavings from your skin.
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If there are no issues with driving, some suggest cleaning the pan, changing the filter and adding new fluid
It is not uncommon for automatic transmission pans to have metal shavings in them. However, if there are no issues with driving and no other signs of internal damage, some suggest cleaning the pan, changing the filter and adding new fluid.
To clean the transmission pan, first, let your car idle for a few minutes as transmission fluid drains better at operating temperature. Then, turn off the ignition, raise and secure the vehicle, and lay down a tarp, cardboard, or newspaper under a catch pan. Remove the bolts from one side of the transmission pan, being cautious of hot parts and fluid. Loosen the other bolts gradually, allowing the pan to tilt and begin to drain. Once all bolts are removed, lower the pan and empty the remaining fluid into the catch pan.
Next, clean the pan with a solvent, removing any metal shavings or debris. You can then install a new transmission filter, ensuring that its O-ring seats correctly. Reattach the gasket to the pan with oil-soluble grease, and refer to your service manual for any specific instructions on using thread sealer on the transmission pan bolts. Screw in all fasteners finger-tight, then torque the pan bolts to the specified tightness in a spiral pattern starting at the centre.
Finally, lower the vehicle and fill the transmission with the recommended amount of fluid. Start the vehicle, warm it up, then shut it off and check for leaks.
It is important to note that this is a general guide and that you should refer to your vehicle's owner's manual or service manual for specific instructions and recommended service intervals. Regular fluid changes can help prolong the life of your vehicle, and it is recommended to change the automatic transmission fluid every 30,000 miles or 30 months, or sooner if the fluid appears dark or burnt-smelling.
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Frequently asked questions
Automatic transmission pans usually have some metal shavings, but only on the magnet. If the shavings are “chunky" or smell burnt, this could indicate an issue.
If you find metal shavings in your transmission pan, it is recommended to clean it, finish changing the filter, and bolt it back together. If there are operational signs of failure, it may be necessary to rebuild or replace the transmission.
Metal shavings in a transmission pan can be caused by gears and bearings self-destructing due to rotating parts rubbing against the case or mismatched, non-compatible parts.
To identify metal shavings in your transmission pan, use a gloved hand to scoop out the substance and rub it between your fingers. If it feels grittier than fine sand, it may indicate an issue. Additionally, check if there are any chips or chunks, which could be a cause for concern.
