Some aftermarket u-joints have a small plug that you can unscrew and replace with a zerk fitting. It's easiest to do this off the car. Lube em up, them remove the fitting and reinstall the plug. If you don't, you'll probably break the fitting when the suspension moves up or down. There isn't much room in there.
No, Rob Dyno grease - ha! (by the way AutoZone here blew out their Quaker full synthetic @ $1 a quart. I was almost ready to convert except the guy that told me beat me there and bought all they had) BACK TO THE PROBLEM: The joints are the original ones and had they had plugs in them. I have the grease gun flex adapter but it is still too big to fit between the castings (I have tried every angle). I tried to get a male/female adapter/extension but have had no luck finding one (I did find one for the larger 1/4" size). This is a real puzzle - I sure don't want to remove the half shafts to just lube them. And I'm really not interested in turning one on the lathe. Someone must make this part somewhere.
i think it's a metric straight thread that goes in there. Really good auto parts supliers should have an adapter that you can screw into the hole and it just clears the yokes. I think I bought mine as a farm supply store. I just have the one and screw it in each joint as I grease them. The other guys are right, if it stays there, it'll get smashed when they rotate. Good luck Rojer.
roger, I just went out to my "'ole pile 'o halfshafts" and noticed that one had a zerk in it on a short, hexagonal standoff-looking thing, and it cleared the yoke pinch point. You may want to look under some cars in the junkyard, as that's where that shaft came from. You could hork a few of those adapters and yould be all set. again, good luck...
I think its a standard NPT thread, not metric, but I'm not postive. If you wanted to mess around with it to avoid pulling it, I'd try a short piece of threaded pipe and a coupling, if you can find one to fit. Thread the coupling onto the pipe, thread the pipe in the u-joint, and screw the zerk in. Lube, then remove and plug. Just a theory, but let us know if you find something to work. I'll check the next time I'm at the hardware or auto store this weekend for some small pipe and couplings. Even plastic should work.
The only other thing to try, is to move the suspension up and down with a jack while the body is on a stand and see if you can find a spot to get in there. Otherwise, pull the shafts (even just one end might work).
I know what you mean. Here is what I do. There hard to find... but if you look around and ask. There is a needle point that will fit on to the standard grease gun tip. it acts like and extension. It just barely covers the head of the fitting. But works great. I have 4x4 truck (toyota) that required this. There out there just need to look real good and ask.