More Airsporter help please

[philcbr]

Thank you all for your helpful suggestions.
I have purchased a standard main spring from one of the well-known suppliers. The spring has the same number of coils and the wire thickness is the same as the old one so I'm guessing this is not the cause of the problem.
My concern centres on the fact some of the thread has been removed from the part that screws in to the cylinder. It seems to me if that had not been performed the piston would not travel far enough into the trigger block to latch the main sear? Are the pistons from the MK1 and mk2 the same dimensions?
I have tried putting the gun back together minus the spring, pushing the piston by hand does not engage the main sear also.
I have inspected the pivot points and the piston and do not see any appreciable wear with the contact points, at least not to my inexperienced eye.
When operating the cocking lever it travels to its fullest extent limited only by the stud that is screwed in to the cylinder.
I am including links to some pictures that might better illustrate my situation.

http://i513.photobucket.com/albums/t...psmnxx9kx7.jpg
http://i513.photobucket.com/albums/t...psd9o5ytwa.jpg
http://i513.photobucket.com/albums/t...pssqonuhuc.jpg

Once again thanks for any suggestions or solutions that might be forthcoming.
Regards
Phil

[Benelli B76]

Is the trigger/sear spring installed correctly ?

Baz

[Airsporter1st]

Thank you all for your helpful suggestions.
I have purchased a standard main spring from one of the well-known suppliers. The spring has the same number of coils and the wire thickness is the same as the old one so I'm guessing this is not the cause of the problem.
My concern centres on the fact some of the thread has been removed from the part that screws in to the cylinder. It seems to me if that had not been performed the piston would not travel far enough into the trigger block to latch the main sear? Are the pistons from the MK1 and mk2 the same dimensions?
I have tried putting the gun back together minus the spring, pushing the piston by hand does not engage the main sear also.
I have inspected the pivot points and the piston and do not see any appreciable wear with the contact points, at least not to my inexperienced eye.
When operating the cocking lever it travels to its fullest extent limited only by the stud that is screwed in to the cylinder.
I am including links to some pictures that might better illustrate my situation.

http://i513.photobucket.com/albums/t...psmnxx9kx7.jpg
http://i513.photobucket.com/albums/t...psd9o5ytwa.jpg
http://i513.photobucket.com/albums/t...pssqonuhuc.jpg

Once again thanks for any suggestions or solutions that might be forthcoming.
Regards
Phil

Something is wrong with that trigger in the photograph. The main sear should be sitting lower under the force of the trigger spring acting at the back end and the vertical sear bearing surface should be higher than and in front of the main sear. Don't have a photo of how it should be at the moment, but yours is definitely not right.

P.S. Found a pic of how it should look before cocking here
P.P.S. You have not secured your Photobucket, so all your photos are available to be viewed. You eed to set your album(s) to 'Private' if you don't one anyone else to browse through them.

[Benelli B76]

Yes, the sear is too high blocking the piston from latching. Somehow the spring is not exerting enough pressure upwards.

Baz

[philcbr]

Thank you all again for taking the time to suggest solutions to my problem.
I have reassembled the trigger as it came to me when I got the gun. I’ve uploaded more pictures that better show the trigger components as assembled by me.
It seems to function as a trigger ok but not latch due to insufficient travel of the piston in to the trigger block, sorry if I’m repeating myself in this matter but I can’t see how it would have worked even before I got it.
More pictures.

http://i513.photobucket.com/albums/t...psnixh5cjt.jpg

http://i513.photobucket.com/albums/t...psmcdqprgo.jpg

regards
phil

[Airsporter1st]

Thank you all again for taking the time to suggest solutions to my problem.
I have reassembled the trigger as it came to me when I got the gun. I’ve uploaded more pictures that better show the trigger components as assembled by me.
It seems to function as a trigger ok but not latch due to insufficient travel of the piston in to the trigger block, sorry if I’m repeating myself in this matter but I can’t see how it would have worked even before I got it.
More pictures.

http://i513.photobucket.com/albums/t...psnixh5cjt.jpg

http://i513.photobucket.com/albums/t...psmcdqprgo.jpg

regards
phil

The trigger certainly looks right now, anyway.

No idea what is wrong now, but there must be a reason! Can you take a similar picture to the first one, but with the piston rod fully inside the trigger block to its maximum depth?

[tomlinn]

How much did you polish the underside of the piston where the cocking lever sits? I had this problem where around 1mm had worn away. This then caused it to not latch fully when cocking as the lever could not push the piston back far enough before it hit a barrier. If the gun was doing this already it might explain why they removed threads to try and make up the difference. However I fixed it by welding a couple of mm back on to the underside of the piston. It was surprising how that slight worn down area caused the issue. You can test this by placing something in to create a gap and testing the movement without the spring in to see if it latches.

[philcbr]

Hi all

as requested more pictures added.
While polishing the piston I did not do the end of the rod that inserts in to the trigger block, it does not have any noticable wear marrks on the end.

http://i513.photobucket.com/albums/t...pswuqbdecn.jpg

http://i513.photobucket.com/albums/t...psu09r4vzm.jpg

I will assemble the gun tomorrow minus the spring and try suggestions from the group.

Regards

Phil.