In my previous thread about this rifles jamb (now corrected), HiBC astutely noted that the bolt locking lugs were not returning to the correct 12/6 o'clock positions when the bolt is withdrawn from the locked position. This has not posed a function problem, yet. I note that the bolt can be turned to bring the lugs to the correct position while holding the bolt open by hand. It can't easily be reached it when locked back.
Now, I would 'assume' that this indicates that either one or both cam pins are worn/mismatched or the helical channel the cam pins travel in is worn. The real question here is if my assumption is a good place to start my investigation or if I should be looking at other things I am not thinking about.
I have 2 cam pins due to arrive today. If for no other reason to compare to the ones I have. Lord knows if the ones arriving today are 109 years old and completely worn out or not. But they were cheap and I had other parts for another rifle coming anyway.
Although the locking lugs are not exactly at 12/6 o'clock, the lugs pass the end of the barrel without contact. There is no sign of battering of the lugs one would see if the lugs contacted the end of the barrel barrel. Is it possible that this timing was close enough to leave the factory the way it is?
The rifle is 91 years old and although in very nice mechanical shape there were tell tale signs of people working on it that didn't know what they were doing. There were several small pieces missing (now replaced). But the cam pins could have been from another rifle. There just isn't a way to know for sure.
Is there any source that could tell us what the nominal dimensions are for the cam pins? Also how to determine if the helical channels are worn?
I am still trying to re-activate my account at the Great Model 8 forum. But until someone there replies to my e mail I am locked out.
Now, I would 'assume' that this indicates that either one or both cam pins are worn/mismatched or the helical channel the cam pins travel in is worn. The real question here is if my assumption is a good place to start my investigation or if I should be looking at other things I am not thinking about.
I have 2 cam pins due to arrive today. If for no other reason to compare to the ones I have. Lord knows if the ones arriving today are 109 years old and completely worn out or not. But they were cheap and I had other parts for another rifle coming anyway.
Although the locking lugs are not exactly at 12/6 o'clock, the lugs pass the end of the barrel without contact. There is no sign of battering of the lugs one would see if the lugs contacted the end of the barrel barrel. Is it possible that this timing was close enough to leave the factory the way it is?
The rifle is 91 years old and although in very nice mechanical shape there were tell tale signs of people working on it that didn't know what they were doing. There were several small pieces missing (now replaced). But the cam pins could have been from another rifle. There just isn't a way to know for sure.
Is there any source that could tell us what the nominal dimensions are for the cam pins? Also how to determine if the helical channels are worn?
I am still trying to re-activate my account at the Great Model 8 forum. But until someone there replies to my e mail I am locked out.