1993 Jeep YJ 2.5 AX-5 Transmission Plugs

[jeepusa]

On the AX-5 manual transmission, there is a "Do Not Remove" plug. I haven't touched it although I did do a transmission fluid change a few months ago. I used the correct fill hole that's up and to the left of that "Do Not Remove" plug on the passenger side.

But, today, I noticed that I was seemingly leaking some fluid from that "Do Not Remove" plug. I felt it, and I could tighten it by hand ... It was that loose. I don't have the tool that's used to remove that plug so I just took some slip pliers and tightened it down as best as I could. It also seemed to have a gasket/seal behind it. Any ideas how/why that plug would become loose? I'm now nervous that I'm low on transmission fluid b/c of this leak.

Also, on the driver's side of the transmission, I have another plug that has the blue paint mark on it (I'm assuming from the factory). Any idea what this plug is for?

 

[Chris]

On the AX-5 manual transmission, there is a "Do Not Remove" plug. I haven't touched it although I did do a transmission fluid change a few months ago. I used the correct fill hole that's up and to the left of that "Do Not Remove" plug on the passenger side.

But, today, I noticed that I was seemingly leaking some fluid from that "Do Not Remove" plug. I felt it, and I could tighten it by hand ... It was that loose. I don't have the tool that's used to remove that plug so I just took some slip pliers and tightened it down as best as I could. It also seemed to have a gasket/seal behind it. Any ideas how/why that plug would become loose? I'm now nervous that I'm low on transmission fluid b/c of this leak.

Also, on the driver's side of the transmission, I have another plug that has the blue paint mark on it (I'm assuming from the factory). Any idea what this plug is for?

The "Do Not Remove" plug is typically a vent plug, and it should be left alone to prevent any contamination or issues down the line. However, if it has become loose on its own, it could be due to vibrations or thermal expansion/contraction of the metal components over time. It's good that you tightened it down.

As for the gasket or seal you mentioned, it's possible that it may have deteriorated over time, which could also contribute to the leakage. If you’re concerned about the fluid level, it's best to check it soon. The transmission should be filled to the appropriate level, and if any has leaked out because of that loose plug, you might need to add more fluid.

Regarding the blue paint-marked plug on the driver's side, that’s usually a drain/plug for the transmission. Some owners use it for fluid level checks in specific situations or as a way to drain the transmission completely. It's always best to consult a service manual for your specific model to be sure of its function and whether it requires any attention.

Make sure to monitor the area for any further leaks after you've tightened the plug and check the transmission fluid level to ensure you're good to go! If the leak persists or you're uneasy about it, it may be worthwhile to get it looked at by a professional to avoid any potential issues.

 

[theo332]

On the AX-5 manual transmission, there is a "Do Not Remove" plug. I haven't touched it although I did do a transmission fluid change a few months ago. I used the correct fill hole that's up and to the left of that "Do Not Remove" plug on the passenger side.

But, today, I noticed that I was seemingly leaking some fluid from that "Do Not Remove" plug. I felt it, and I could tighten it by hand ... It was that loose. I don't have the tool that's used to remove that plug so I just took some slip pliers and tightened it down as best as I could. It also seemed to have a gasket/seal behind it. Any ideas how/why that plug would become loose? I'm now nervous that I'm low on transmission fluid b/c of this leak.

Also, on the driver's side of the transmission, I have another plug that has the blue paint mark on it (I'm assuming from the factory). Any idea what this plug is for?

That plug can loosen over time from heat and vibration, especially if the seal starts to degrade. The one with the blue mark is likely the reverse light switch. Good call tightening it—I'd top off the fluid just to be safe.

 

[Flyer58]

Most of those plugs with a Torx (star shape) head will be holding a spring and ball in place which keep the transmission in gear when driving. I think mine had a copper washing to seal it. If yours in tight, it should not leak.

I bought a set of Torx drivers for less than $10. Same type used to adjust door hinges.

 

[jeepusa]

Thanks everyone. I’m going to top it off to make sure. May get a torx set to tighten it down more as it seems to still be a little wet around the edge where the gasket is behind the plug. Anyone know what size torx will fit it? Seems like a rather large one.

Also, if that gasket/seal behind the plug is just shot, what do I do since I won’t be able to unscrew that plug?