subject: What Causes Transmission Leaks? [print this page] Fluid leaks can range in severity, but if not dealt with promptly can lead to larger problems caused by friction and heat. Luckily, most transmission leak repairs are simple, easy, and inexpensive to repair. With that said, there are also more expensive repairs such as ones caused by damaged output seals. But what exactly causes these fluid leaks? There are several things that can lead to leaks of transmission fluid. Let's take a look:
1) Loose bolts
One of the most common causes of transmission leaks is loose bolts. If you have a transmission leak and your mechanic tells you that this is the problem - that is good news because loose bolts are very simple to fix. Many times these are simply bolts that have come loose, or that were not tightened properly after a previous servicing. It is important to remember, however, that even though loose bolts are easy to fix, minor problems like these can quickly cause more severe damage to the transmission if not dealt with promptly. This is why it is so important to check your transmission fluid levels regularly.
2) Worn out seals and gaskets
Another common cause of fluid leaks is worn out seals and gaskets. Over time, it is not uncommon for gaskets and seals to become frayed, cracked, or otherwise worn out. When this happens, transmission fluid will begin to seep through the transmission pan. Luckily, this is another cheap and easy fix, usually costing around $20-$30 for the replacement part, plus labor fees.
3) Cracks or Faulty Bearings in Torque Converter
While this is a much less common cause of leaks, faulty needle bearings or cracks in the torque converter can also lead to transmission fluid leakage. To bring you up to speed, it is the torque converter that creates pressure within the transmission, sending the fluid throughout the system. Unfortunately, these problems can sometimes be difficult to diagnose. In addition, they are more costly to repair than smaller problems like worn out seals and loose bolts.
4) Cracked Bell Housing Unit
Shaped like a bell, it is the bell housing unit that covers the flywheel and torque converter of the transmission. While it is not a common problem, this cover can sometimes be damaged while driving on roads with flying stones and rocks. If struck by a large rock, the bell housing unit can become cracked or damaged leading to immediate loss of transmission fluid. If this happens, your vehicle will probably not move at all. Extreme road conditions can also cause damage to transmission fluid lines which can lead to difficult repairs or the need for a transmission rebuild.
5) Other
Other causes of transmission fluid leaks include warped transmission pans and improper torquing of the transmission pan bolts. Unfortunately, transmission fluid leaks are not only a problem for your vehicle, they are also hazardous to the environment.
