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853 a second rebuild so soon: replacing O-rings /valve kits an ongoing problem?

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Ronfiveo:
It looks like my 853 needs another rebuild. :(

It wasn't that long ago about a month or so, that I replaced the O-rings and valve with the rebuild kit.

Everything was find until a couple of days ago when the last shots of the day dropped from the POI about 1 1/2".
The next shots were about 2" low. It was getting late so I just put it up.

The next day nothing changed, but for an unknown reason, it started firing like normal with normal velocity.
That was a day and a half ago and now it's dropping shots again.

I'll bet I haven't put a thousand rounds through it since the rebuild.

Is this a usual problem inherent of all 853s ?

I really don't want to do this again, especially so soon after the first rebuild replacement kit.

I would like to hear from those who have had to rebuild theirs more than once in a short period of time.

Thank you so much.

Ron

 

Ronfiveo:
I had the innards apart when I did the trigger mod and looking at the photo again
it looks like the O-ring is too narrow.
This is the same O-ring that was sent to me from the CMP people. He sent me three kits, and
maybe this should have been a message or at least an omen that this happens often.

Look at the O-ring. It appears that it's too narrow, right.



Ron

Back_Roads:
 Ron when you installed that oring did you use silicone grease on it or at lest some nd 30 ??? It looks to have some metal transfer dirt on areas that may be where it failed .

Ronfiveo:

--- Quote from: Back_Roads on April 27, 2024, 09:27:50 AM --- Ron when you installed that oring did you use silicone grease on it or at lest some nd 30 ??? It looks to have some metal transfer dirt on areas that may be where it failed .

--- End quote ---

I used some Pelgun oil, and that was probably the wrong lube to use.
I now have some Super O-ring Lube that I'll use this time.
I'll also clean the tube a lot better.

Thanks for the heads up.

Ron

Back_Roads:
 Hope this time it takes, on the other hand you will get real good at this, I lost count how many times I have had Daisy 880s apart, but that was for my tinkering pleasure ;)

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