Author Topic: Welded and repaired Stihl 084 decomp boss  (Read 109 times)

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Online srcarr52

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Welded and repaired Stihl 084 decomp boss
« on: May 28, 2015, 12:52:07 pm »
Someone must have ham handed the decomp in and it **** the top of the boss off the cylinder.





Build up weld.



Drilled and taped new hole on the mill and then finished off the rest by hand. The hole was a little off originally from the remainder of the original. I had to move it over so the decomp would seat correctly, so the threads are not full circle but it's plenty to hold it tight.





After a little blending with the bead blaster. (Sorry for the sideways picture, photobucket takes forever to update an edited picture.)

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Offline Cut4fun .

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Re: Welded and repaired Stihl 084 decomp boss
« Reply #1 on: May 28, 2015, 12:57:09 pm »
Very nice. I had a 084 cyl with bad decomp hole that could have used that treatment.

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Online srcarr52

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Re: Welded and repaired Stihl 084 decomp boss
« Reply #2 on: May 28, 2015, 01:01:13 pm »
Very nice. I had a 084 cyl with bad decomp hole that could have used that treatment.


Hmm, so this is a common failure?

Offline Cut4fun .

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Re: Welded and repaired Stihl 084 decomp boss
« Reply #3 on: May 28, 2015, 03:01:06 pm »
Very nice. I had a 084 cyl with bad decomp hole that could have used that treatment.


Hmm, so this is a common failure?


Mine was the first I had seen. But Lakeside Andy seemed to say it was pretty common when I ask him about it.  He had pretty much said to fix the same way you did.

Not sure but thinking Ron may have my old cylinder. The threads were gone on half a side if I remember right.  @man of stihl
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Offline man of stihl

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Re: Welded and repaired Stihl 084 decomp boss
« Reply #4 on: May 28, 2015, 04:59:00 pm »
Very nice. I had a 084 cyl with bad decomp hole that could have used that treatment.


Hmm, so this is a common failure?


Mine was the first I had seen. But Lakeside Andy seemed to say it was pretty common when I ask him about it.  He had pretty much said to fix the same way you did.

Not sure but thinking Ron may have my old cylinder. The threads were gone on half a side if I remember right.  @man of stihl
Yep I still have that cylinder.
Nice looking fix srcarr
Ron

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Re: Welded and repaired Stihl 084 decomp boss
« Reply #5 on: May 28, 2015, 08:59:37 pm »
Nice fix, I like the bead blast blend.   Makes it look good.    And looks do matter.
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Offline mdavlee .

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Re: Welded and repaired Stihl 084 decomp boss
« Reply #6 on: May 29, 2015, 11:22:28 am »
Good looking work. I think I know who's cylinder that is.

Online srcarr52

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Re: Welded and repaired Stihl 084 decomp boss
« Reply #7 on: May 29, 2015, 02:09:39 pm »
Good looking work. I think I know who's cylinder that is.

Yes you do, thanks for the referral.

Offline mdavlee .

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Re: Welded and repaired Stihl 084 decomp boss
« Reply #8 on: May 29, 2015, 06:45:26 pm »
No problem.

Offline chy_farm

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Re: Welded and repaired Stihl 084 decomp boss
« Reply #9 on: September 28, 2017, 08:30:48 pm »
Good looking work. I think I know who's cylinder that is.

Yes you do, thanks for the referral.
Very good job Srcarr, what kind of filler rod do you use for this job, I mean cylinder repair?
I have A-4043 (which is so called silicon-rich), A-5356 (mag-rich) and A-5183 (also mag-rich), wonder if I can try this job with one of these rods, thanks in ahead.
Chy

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