Bad U-Joint?

[4OYOTER]

In my quest to figure out my post lift vibration I discovered my first zerk coming out of the front diff won't take any grease before it starts expelling an odd color grease. My other spider yokes took a few pumps before starting to expel black grease. Is this normal? Or is this a bad UJoint?

 

[wfo9]

In my quest to figure out my post lift vibration I discovered my first zerk coming out of the front diff won't take any grease before it starts expelling an odd color grease. My other spider yokes took a few pumps before starting to expel black grease. Is this normal? Or is this a bad UJoint?

View attachment 249169

You think it is bad because of the color of the grease? There are many different grease colors.... I would not worry about it.

 

[Ralphman]

Like said before grease comes in many colors and unless you have alot of slop in the u joint you should be fine.
Just went through this issue on my 4th gen on 10 month old 10k u-joint, grease was only going to three of the bearings and turned the 4th into dust. As long as grease is coming out of all 4 and gets greased regularly it shouldn't be an issue

This is a slow mo video of a a bad ujoint but turn the volume down because it sounds like a dyno room with a 12v-71
https://youtu.be/np8rSDYFsX4

 

[Antman]

Green grease usually indicates an infection in the joint. Better take it to the ER.

 

[4OYOTER]

Should I keep pumping until fresh black grease comes out, so I can make sure the green infected grease is gone? (Honest question)

 

[Ralphman]

Its only going to come out black if the grease has turned black. If you want you can pump grease until its to color thats going in but that will be messy and excessive.

 

[1engineer]

Should I keep pumping until fresh black grease comes out, so I can make sure the green infected grease is gone? (Honest question)

No. You have gangrene grease. If it turns black you must remove the infected joint. Amputation is necessary or your truck will die. It's much more common in the Jeep ethnicity than the Toyota ethnicity.
#400levelsarcasm

 

[Ralphman]

No. You have gangrene grease. If it turns black you must remove the infected joint. Amputation is necessary or your truck will die. It's much more common in the Jeep ethnicity than the Toyota ethnicity.
#400levelsarcasm

This is why you take high pressure injection seriously