Security Six Crane to Frame Play

[WarpathEngineering]

I picked up a used Security Six recently and upon closer inspection noticed that the front of the cylinder is striking the end of the barrel as you swing it into the frame. Once in the frame, the cylinder is solid with very little fore and aft play and rotates freely. It appears that the majority of the play is actually in the crane where it enters the frame. Can this be shimmed or is there something else to look for?

 

[Bud0505]

Make sure the ejection rod is tight. The ejection Rod is a reverse thread. Could be your problem.

 

[WarpathEngineering]

I guess I titled this wrong (now edited). The issue doesn't seem to be an endplay issue between the cylinder and crane, there is very little fore and aft play of the cylinder on the crane and when in the frame there is even less. The issue appears to be between the crane and frame where there is a lot of play for and aft. Is there a way to correct fore and aft play in the crane to frame attachment?

 

[bcgunworks]

Yes. You can make shims to push the crane itself forward. You can also adjust it's "locking" knotch where it's captured by welding, machining, peening and so on

 

[WarpathEngineering]

I took a better look at it today and I think my problem is in the barrel, it's too long. Cylinder gap is less than .004 but larger than .0015. Unfortunately I don't have feeler gauges between those two. I'm measuring .028 between the crane and frame with the cylinder open (endplay).

Who's a good Ruger Revolver Smith I can send this to?

 

[RoninPA]

If you are talking about the paly in the crane when the cylinder is open, watch it when you close the cylinder. Do you see a bit of a gap between the crane and the frame at the bottom (where it rotates)? If you do, if you push on the crane does it go back to where it meets the frame correctly? If so, then the cylinder latch spring could be the culprit. The cylinder latch plunger and spring are the pieces that bear against the cylinder latch to keep it in place. If the spring is a bit too long or too strong, it forces the crane pivot assembly forward a little. If, when you close the cylinder, you have to push the cylinder back a little to get it to close that is where I would look first. If, when it is closed, the cylinder rotates smoothly, and the gap stays around 0.003, and it shoots ok, then it is more of a bother than a mechanical failure.

If you disassemble your gun, when you remove the trigger group you can see the relationship of the crane pivot assembly, cylinder latch, cylinder latch plunger and the cylinder latch spring.

 

[WarpathEngineering]

RoninPA,

That is the problem in a nutshell. In order to close the cylinder, I have to push back on the cylinder or crane assembly otherwise the front of the cylinder will strike the back of the barrel. Once the cylinder is in place and locked in the frame everything works perfectly however I can still press on the front of the crane assembly and it will move a little (endplay). It is good to here that this is more of a bother than a failure but I will investigate replacing the spring to see if this corrects anything.

As to shooting, that remains to be seen.