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Old 05-30-2020, 08:17 PM
Skeeter333 Skeeter333 is offline
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Sear reset issue Sear reset issue Sear reset issue Sear reset issue Sear reset issue  
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Default Sear reset issue

I have a three year old model 67 which has about 500 rounds through it. I recently did a light trigger job on it. I say light because I didn't work on every possible surface, and the ones I did work on I went pretty conservatively. My primary goal was to improve double action smoothness. Upon reassembly I found that about every 5 or 10 double action firings, the sear would not properly reset past the trigger. The first photo shows [ATTACH]Sear reset issue-trigger3-jpg[/ATTACH] proper reset and the the second photo shows that sear tip has not cleared the surface of the trigger. Sear reset issue-trigger3-jpgI did do some stoning on this surface of the trigger but I did not touch the tip of the sear. I did lightly stone the broad surface of the sear.

The other interesting thing happening is that the the sear is rising up from the side of the gun. When I push down on it like I show in the third photo, it resets. Sear reset issue-trigger4-jpg

Initially I had a Wolf hammer spring and 15# rebound slide spring installed. I put the stock springs back in and still have the issue. Thoughts on what is happening?
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Old 06-02-2020, 09:48 AM
Hondo44 Hondo44 is offline
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Have you tried it with the side plate re-installed? That'll keep the sear from rising up and keep it in the position where it works properly,

It's not unusual for the function to be different with side plate removed. In fact the action should not be operated too much with side plate removed. Because the hammer and trigger studs are not supported in their sockets on the side plate. They can flex and parts operate differently when not supported at both ends.
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Old 06-02-2020, 10:34 AM
Protocall_Design Protocall_Design is offline
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It sounds like the sear spring may not be seated correctly, or maybe it got bent, causing the sear to go sideways. That spring is delicate and finicky. You probably need to examine it under magnification. There is a depression in the hammer for the end of the spring to seat in.
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Old 06-02-2020, 12:53 PM
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Quote:
Originally Posted by Hondo44 View Post
Have you tried it with the side plate re-installed? That'll keep the sear from rising up and keep it in the position where it works properly,

It's not unusual for the function to be different with side plate removed. In fact the action should not be operated too much with side plate removed. Because the hammer and trigger studs are not supported in their sockets on the side plate. They can flex and parts operate differently when not supported at both ends.
Thanks for your reply. It does happen with the side plate installed.
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Old 06-02-2020, 12:57 PM
Skeeter333 Skeeter333 is offline
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It sounds like the sear spring may not be seated correctly, or maybe it got bent, causing the sear to go sideways. That spring is delicate and finicky. You probably need to examine it under magnification. There is a depression in the hammer for the end of the spring to seat in.
This was running through my mind. I did not remove the sear from the hammer although I did do some light stoning on the broad face of the sear by fulling compressing it into the hammer. Could I have damaged the sear spring by doing that? I'll look under magnification and report back.

Does the hammer block play a role in keeping the sear in place? I did some stoning on all sides of it but I can't imagine I changed its thickness too much.
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Old 06-02-2020, 01:11 PM
Protocall_Design Protocall_Design is offline
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The hammer block doesn't come in contact with the D/A sear. It's pretty hard to mess up a hammer block unless you change it a lot.

You may or may not need to take the sear and spring off to see what's going on there. If the spring is messed up, new ones are cheap. Get a couple of extra.
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Old 06-02-2020, 06:53 PM
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I opened it up today and took a closer look at the sear spring. It didn't look quite right.
Sear reset issue-trigger5-jpg

I pulled the spring out and there is some obvious deformation. Question is, did the deformed spring start causing sear problems, or did the sear problems cause the spring to deform?
Sear reset issue-trigger6-jpg

I removed the sear and spring and then reassembled them. I am pretty sure the spring ends are where they need to be but it still looks a little wonky. Still suffers from the same DA problem. After reassembly:
Sear reset issue-trigger7-jpg

I'll order some new springs and see if that helps. Can anyone recommend a good source for these springs?
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Old 06-02-2020, 06:59 PM
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Brownell's carries the sear springs for the MIM hammers......

K-Frame 67-4 | Top Rated Supplier of Firearm Reloading Equipment, Supplies, and Tools - Colt

You might consider ordering a new sear also.
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Old 06-02-2020, 07:02 PM
Protocall_Design Protocall_Design is offline
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S&W factory, Brownell's gunsmith supply, Midway USA, Gun Parts Corp., Jack First.

The deformed spring caused the sear problem. Once the spring is properly installed, the sear moving front to back will not damage the spring. If the sear is moved sideways with the bottom of the spring captured in the hammer recess, it will damage the spring.
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Old 06-02-2020, 10:20 PM
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Quote:
Originally Posted by armorer951 View Post
Brownell's carries the sear springs for the MIM hammers......

K-Frame 67-4 | Top Rated Supplier of Firearm Reloading Equipment, Supplies, and Tools - Colt

You might consider ordering a new sear also.
Thanks for the link. Ordered.
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Old 06-02-2020, 10:21 PM
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Quote:
Originally Posted by Protocall_Design View Post
S&W factory, Brownell's gunsmith supply, Midway USA, Gun Parts Corp., Jack First.

The deformed spring caused the sear problem. Once the spring is properly installed, the sear moving front to back will not damage the spring. If the sear is moved sideways with the bottom of the spring captured in the hammer recess, it will damage the spring.
I really appreciate you taking the time to talk me through this.
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Old 06-03-2020, 09:54 AM
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Glad I was able to help. I think you will really enjoy shooting your M67 once this is all ironed out.
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Old 08-01-2020, 04:13 PM
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Update- I replaced the deformed sear spring an now all is well.
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