I found this solution in an old thread and thought it would be helpful to note that it works like a charm. I have a 4110 LCG which is basically a 3000 with a 4000 diesel engine. I really struggled trying to get the plug to move. It takes a 3/8 fine thread bolt. I tried hooking onto the bolt with vise grips and hammering. No luck. I tried a slide hammer like the IT manual said. No luck. Then I read GeorgeW's solution.
I found a scrap 8 inch length of 1.5 inch, 1/8 thick angle and drilled a hole big enough for the 3/8 bolt in one wing. I used two stout bolts with nuts attached as risers on either side of the plug. I ran the bolt through a stack of washers and the angle, then put the whole thing on the risers. Threading the bolt about halfway into the plug, I added a little PB Blaster. I started cranking on it with a ratchet and it started to move. When the bolt bottomed out, I backed it out, added more washers and screwed it back in. The plug is shaped like a dumbbell and can only be removed by pulling it straight out. This did the trick.
I found a scrap 8 inch length of 1.5 inch, 1/8 thick angle and drilled a hole big enough for the 3/8 bolt in one wing. I used two stout bolts with nuts attached as risers on either side of the plug. I ran the bolt through a stack of washers and the angle, then put the whole thing on the risers. Threading the bolt about halfway into the plug, I added a little PB Blaster. I started cranking on it with a ratchet and it started to move. When the bolt bottomed out, I backed it out, added more washers and screwed it back in. The plug is shaped like a dumbbell and can only be removed by pulling it straight out. This did the trick.
