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Morini CM22 M
Posted: Mon Jul 07, 2008 11:09 am
by tleddy
I had an unusual event Sunday with the Morini.
The group size started to open up in a random distribution. My first opinion is that it is the loose nut behind the grip causing the problem. After regaining focus, no improvement. Went to the 25 yd line and still the same problem.
Suddenly realized that the gun felt mechanically "loose"... sure enough, the cap bolt on the bottom of the frame in front of the trigger guard had become very loose!
After tightening the cap bolt the groups returned to normal and finished up with a 97 and 95 in rapid fire.
Anyone out there have the same problem and, if so, what did you do for a permanent fix??
Tillman from the Dark Side
CM22 frame bolt becoming loose
Posted: Mon Jul 07, 2008 11:22 am
by Jacktheshootist
This has been a constant problem with all models of the CM22M/32M. Ever since the arivel of that model. This is the main bolt that holds the upper and lower frames together.
You can use lock-tite. And you will have to use lock tite again after each cleaning of the gun. Why is Morini not fixing this problem?
Morini CM22 M
Posted: Mon Jul 07, 2008 12:04 pm
by tleddy
Thanks Jack...
Has anyone tried a star lock-washer for the bolt?
Tillman
Re: Morini CM22 M
Posted: Mon Jul 07, 2008 1:31 pm
by Jacktheshootist
tleddy wrote:Thanks Jack...
Has anyone tried a star lock-washer for the bolt?
Tillman
The hole for the bolt in the lower frame is countersunk (cone). You will need a coneshaped locking washer...:-(
Posted: Mon Jul 07, 2008 1:37 pm
by Gort
The screw on my CM22-RF is a Torx with a 82 degree conical head, precluding the use of a washer. Proper torque of the screw will fix the problem. Morini should provide the torque spec for the screw.
Gort
Torquing down did not help much.
Posted: Mon Jul 07, 2008 1:42 pm
by Jacktheshootist
Gort wrote:The screw on my CM22-RF is a Torx with a 82 degree conical head, precluding the use of a washer. Proper torque of the screw will fix the problem. Morini should provide the torque spec for the screw.
Gort
Yes, it is a Torx. I have even invested in a special rubber handled Torx screwdriver to bring to the range along with my CM22M.
Torquing down does not help much. Retorquing often a must after some strings.
Posted: Mon Jul 07, 2008 3:19 pm
by Reinhamre
I was told once that a thin brass washer on the rear "post" does solve this problem. I know the problem from a CM 22 I had once. My new CM22 RF has not become loose yet after 2000 shots.
Kent
Torx
Posted: Tue Jul 08, 2008 2:35 am
by tleddy
What is the bit size of the Torx for the bolt? I do not have any Torx at the moment and would like to get a "T" handle for my gun box.
Tillman
Posted: Tue Jul 08, 2008 4:26 am
by Reinhamre
20
Posted: Tue Jul 08, 2008 5:38 am
by Renback
Also a owner of a quite new Morini CM22RF. Have not encuntered this problem.
Posted: Tue Jul 08, 2008 10:55 am
by jipe
I had to tighten again that bold one time on my CM22M RF after about 1000 shots, the first 1000 shots.
But I do not know how tight the bold was: it was factory (or reseller) tightened since, shame on me, I didn't cleaned nor dismount the pistol till it happened.
Since then, it didn't happen again.
Posted: Tue Jul 08, 2008 2:00 pm
by Renback
jipe wrote:I had to tighten again that bold one time on my CM22M RF after about 1000 shots, the first 1000 shots.
But I do not know how tight the bold was: it was factory (or reseller) tightened since, shame on me, I didn't cleaned nor dismount the pistol till it happened.
Since then, it didn't happen again.
You didn´t dismount it straight away just of keen intererest? 1000 shots is a lot..
That was the first thing I did.. :) Also dismounted the recoilspring and managed to mount it back the wrong way. However, thats sorted.
I think it´s the reseller that mounts the parts together (at least in my country beacause the law demands separate postage for the "vital parts")However. I think it is best to take preacausions not to wreck the thread, by the use of to much force. A factory torquevalue could be useful
I do not use excessive force when tightening the bolt. Have not experienced any losening of the bolt.
Regards
Toby
Posted: Tue Jul 08, 2008 2:11 pm
by Renback
Gort wrote:The screw on my CM22-RF is a Torx with a 82 degree conical head, precluding the use of a washer. Proper torque of the screw will fix the problem. Morini should provide the torque spec for the screw.
Gort
Neeeeeeerd!! :)
Posted: Tue Jul 08, 2008 2:21 pm
by Gort
Toby, Just 30+ years as a tool&die maker, Gort
Posted: Tue Jul 08, 2008 2:27 pm
by Renback
Gort wrote:Toby, Just 30+ years as a tool&die maker, Gort
:)
I really appreciate people with a sense of details!
Posted: Tue Jul 08, 2008 3:33 pm
by jipe
Renback wrote:jipe wrote:I had to tighten again that bold one time on my CM22M RF after about 1000 shots, the first 1000 shots.
But I do not know how tight the bold was: it was factory (or reseller) tightened since, shame on me, I didn't cleaned nor dismount the pistol till it happened.
Since then, it didn't happen again.
You didn´t dismount it straight away just of keen intererest? 1000 shots is a lot..
No, I adjusted the grip, trigger blade, sights but didn't dismount any further. And even after 1000 rounds, when I clean it for the first time, it wasn't dirty at all.