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938 won't engage safety when cocked

This is a discussion on 938 won't engage safety when cocked within the P238, P938 Pistol forums, part of the SIG Sauer Pistols category; Never disassembled except for field stripping for cleaning. The safety will engage when unlocked but not when cocked. I can push the hammer down further ...


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Old 04-15-2017, 10:01 AM   #1
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938 won't engage safety when cocked

Never disassembled except for field stripping for cleaning. The safety will engage when unlocked but not when cocked. I can push the hammer down further and I can then engage the safety.

I did not touch the sear ( whatever that is) except to push down the metal part that sticks up from the frame when the slide is off.

Help!
Thanks
Charles
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Old 04-15-2017, 10:52 AM   #2
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Originally Posted by Mwhq2 View Post
Never disassembled except for field stripping for cleaning. The safety will engage when unlocked but not when cocked. I can push the hammer down further and I can then engage the safety.



I did not touch the sear ( whatever that is) except to push down the metal part that sticks up from the frame when the slide is off.



Help!

Thanks

Charles


Did you happen to pull the trigger when the slide was off during field strip/clean?


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Old 04-15-2017, 01:06 PM   #3
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New pistol? New problem? Round count? Is the sear pivot pin centered side-to-side in the frame?

P938 SearPivotPin.001.jpeg
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Old 04-15-2017, 01:59 PM   #4
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Originally Posted by Mwhq2 View Post
Never disassembled except for field stripping for cleaning. The safety will engage when unlocked but not when cocked. I can push the hammer down further and I can then engage the safety.

I did not touch the sear ( whatever that is) except to push down the metal part that sticks up from the frame when the slide is off.

Help!
Thanks
Charles
Sounds like a factory defect to me. Talk to Sig CS, they'll take care of you.


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Old 04-15-2017, 07:40 PM   #5
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[QUOTE=ajmarkowski;2237706]Did you happen to pull the trigger when the slide was off during field strip/clean?

I might have - I do not remember
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Old 04-15-2017, 07:43 PM   #6
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[QUOTE=ThnkFrst;2238330]New pistol? New problem? Round count? Is the sear pivot pin centered side-to-side in the frame?

Not new but newish. Probably 2000 rounds through it. (I shoot 150-200 rounds/week). New problem after the last cleaning. I have disassembled and reassembled it several times - still the same issue.
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Old 04-16-2017, 03:34 AM   #7
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[quote=Mwhq2;2240386]
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Originally Posted by ThnkFrst View Post
New pistol? New problem? Round count? Is the sear pivot pin centered side-to-side in the frame?

Not new but newish. Probably 2000 rounds through it. (I shoot 150-200 rounds/week). New problem after the last cleaning. I have disassembled and reassembled it several times - still the same issue.
The problem might be with your sear, sear pivot pin and/or hammer. Recommend calling SIG and reporting the problem.
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Old 04-16-2017, 08:39 PM   #8
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ok thanks
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Old 04-17-2017, 06:05 AM   #9
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ok thanks
Please post back here when you determine the issue.

Thanks.
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Old 04-17-2017, 07:32 AM   #10
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I am also interested in the solution to this problem. My new P238 HD has the same problem except it is intermittent. It sometimes works perfectly and then it will be very difficult to engage the safety and sometimes impossible. My solution is to engage the safety before releasing the slide.
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Old 04-19-2017, 07:17 AM   #11
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My sear pivot pin walks out to the left causing same condition all the time.
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Old 04-19-2017, 09:29 AM   #12
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For the safety lever shaft to cam into and engage the hammer's rear safety notch, the sear has to hold the cocked hammer back far enough to allow the safety cam to rotate into the hammer notch. If, for whatever reason, the hammer isn't cocked back far enough, the lower edge of the safety shaft "cam" hits the lower edge of the hammer safety notch comes to a stop before entering . . . pulling the hammer manually back a little, allows the safety to engage . . . not right, of course.

The problem can be, as ThnkFrst and others suggest, one of a few things:

The safety lever shaft is out of spec. It's a MIM part, and I've seen variations in the dimension of the shaft cam section - a few licks with a file, or a new safety lever, fixes this if it is the cause, but check other stuff too, as other things can cause it.

The sear pivot pin has shifted to the side allowing one end of the pin to come out of the frame hole. Sear then goes out of alignment with hammer full cock notch and hammer full cock it a little too far forward. Was there a batch of too-short pins?

Sear is dimensionally out of spec - it's also a MIM part and I've found poorly aligned sear to hammer engagement surfaces on several guns. A trigger job, with the sear stoned can do this. Or simply a wear to the sear/hammer interface that decreases the distance from the sear pivot hole to its engagement surface (fit tolerance may have been tight to begin with and wear pushes it into the "don't work" range.

With a properly fitting P938, as you engage the safety with the hammer cocked, the sear should cam the hammer back a little (further cocked if you will) as the safety is engaged - watch the hammer from the side to see this.
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Old 04-19-2017, 09:51 AM   #13
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Quote:
Originally Posted by jdbish View Post
I am also interested in the solution to this problem. My new P238 HD has the same problem except it is intermittent. It sometimes works perfectly and then it will be very difficult to engage the safety and sometimes impossible. My solution is to engage the safety before releasing the slide.
It makes sense that would work. When the slide is back over the hammer, the hammer is cocked a bit further back than normal which clears the safety shaft to engage the hammer.

You shouldn't have to do that to engage the safety. Strongly recommend that you contact SIG, report the problem and get the pistol repaired under warranty at no cost to you.

Quote:
Originally Posted by Kleiss1 View Post
My sear pivot pin walks out to the left causing same condition all the time.
The grip plates should extend up high enough to cover and retain the sear pivot pin in the frame. Some grips don't and this can happen.

Here again, recommend reporting this problem to SIG and have the pistol repaired.
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