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Chain Saw Collectors Vintage chainsaws and other air cooled gas engine saws, collecting and restoring.

Chain Saw Collectors

Mercury Disston DA 211 I'm working on, pics


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  #11  
Old 02-01-2018, 08:23:18 PM
Big Chip Big Chip is offline
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Default Re: Mercury Disston DA 211 I'm working on, pics

Woah......I see the confusion I have created Mike...
I have redone 6 of those transmissions and everyone has been the same...certainly not to say they didn't change things somewhere along the line...Now i really want to see inside that case...I will see if I can find some more pics...
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Old 02-02-2018, 09:19:21 PM
mschreiber mschreiber is offline
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Default Re: Mercury Disston DA 211 I'm working on, pics

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  #13  
Old 02-03-2018, 10:36:41 AM
Big Chip Big Chip is offline
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Default Re: Mercury Disston DA 211 I'm working on, pics

Very Cool Info Mike.....I certainly stand corrected.......That explains the stud/shouldered stud difference...I assume it means the version with straight studs was the earlier version that needed improving...The studs must be just threaded into aluminum which sooner or later may pull out....Probably why you have a 7/16 thread in one ...
I now know something about those saws I had never came across....and I thought I knew it all......
PS: I wonder if that hole could be heli coiled back to 3/8...?
Or, you could get the local machine shop to make a stepped stud...
The rubber O rings must have also been an update when they changed to
the shouldered studs as they are not shown on diagram..
Part #18 also looks different than any I have seen...It does not show the
extension going back around the 3rd stud...
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Old 02-03-2018, 11:41:30 AM
mschreiber mschreiber is offline
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Default Re: Mercury Disston DA 211 I'm working on, pics

[QUOTE=Big Chip;1458365]Very Cool Info Mike.....I certainly stand corrected.......That explains the stud/shouldered stud difference...I assume it means the version with straight studs was the earlier version that needed improving...The studs must be just threaded into aluminum which sooner or later may pull out....Probably why you have a 7/16 thread in one …

*** I agree, my studs don't go thru to the oil side of the case. I note update changes at the bottom of the parts bk page.

I now know something about those saws I had never came across....and I thought I knew it all......
PS: I wonder if that hole could be heli coiled back to 3/8...?
Or, you could get the local machine shop to make a stepped stud...
The rubber O rings must have also been an update when they changed to
the shouldered studs as they are not shown on diagram..
Part #18 also looks different than any I have seen...It does not show the
extension going back around the 3rd stud…

*** I now agree that the 7/16 bolt is a fix, that cover hole is 7/16 now so i'm not going to 3/8" anything. Maybe that reinforcement extension is part of the blade package????? Aren't there different thickness blades according to chain gauge, bar length and manufacturer? I'm kinda leaning its gotta be near the thickness of the bar u'd put on???

***Its ok that its repaired, i bought it for the bar and chain… transmissions seem to be easier to come by than a super bar w/ chain. Its gonna make noise and cut at engines shows, not really worked. Do u have urs cutting on youtube? most da211's on there actually cutting ARE NOT hot saws and seem to run like crap? deans saws run good but aren't cutting wood. Do u build hot saws 4 competition in ur area? Some on tube are awesome!
/QUOTE]
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Old 02-03-2018, 01:15:09 PM
Big Chip Big Chip is offline
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Default Re: Mercury Disston DA 211 I'm working on, pics

Mike, as far as I know all the bars and chains were .080 gauge ....The bars are just shy of .250" and the groove is .080.. Once again.... I have a bunch of them... 3 and 4 footers, some 9/16 pitch and some 3/4 pitch but they are all the same gauge..
I wouldn't have done this for just anyone...but I went and dug out a bar and took it apart....These pictures will show what the updated version of the "guide rail" part #18 lookes like..
The chain is a well used 3/4 pitch version..
The only reason the 84" bar I had custom made by Gem Chain Bar out in Portland is .122 gauge and 3/8" thick is because the only chain available these days bigger than .404 is what is found on foresters....3/4 x .122..
If I had it to do again I might consider the 404...
To answer your question about using them...I have updated the ignition coils and run the timing at 28 degrees and they run awesome.....I have cut a pile of wood with them over a 40 year span..I have 4 of them of which I keep 2 running..Only real beef is the butterfly shafts always seem worn..
One also has to keep in mind that they are only 9 HP and the gear box is around 4:1 reduction so the chain speed is not that fast..
Unfortunately, I do not have any video...
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Old 02-03-2018, 01:28:31 PM
mschreiber mschreiber is offline
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Default Re: Mercury Disston DA 211 I'm working on, pics

was 9/16 pitch original to these? not available anymore? would 9/16" pitch chain have more links…. cutters? i'm getting ready to time mine and get it actually running next week. thanks.
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Old 02-03-2018, 03:25:58 PM
Big Chip Big Chip is offline
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Default Re: Mercury Disston DA 211 I'm working on, pics

Yes Mike, 9/16 was what most were supplied with when new...That size along with the 50 gauge 3/4 pitch chain have not been made for many years...The DA 211's were only made from around 1951 to 1953..
That bar and chain you have are near mint...great find..
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Old 02-03-2018, 07:50:13 PM
Big Chip Big Chip is offline
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Default Re: Mercury Disston DA 211 I'm working on, pics

Quote:
Originally Posted by Big Chip View Post
Yes Mike, 9/16 was what most were supplied with when new...That size along with the 50 gauge 3/4 pitch chain have not been made for many years...The DA 211's were only made from around 1951 to 1953..
That bar and chain you have are near mint...great find..
I meant to say 80 gauge 3/4 pitch..
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  #19  
Old 02-03-2018, 08:28:29 PM
mschreiber mschreiber is offline
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Default Re: Mercury Disston DA 211 I'm working on, pics

what mix do u run 4 performance? i've got all kinds of opinions. i ask cause i'm not experincened with any kind of 2 cycle stuff/theory. thank u
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  #20  
Old 02-05-2018, 03:34:49 PM
Big Chip Big Chip is offline
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Default Re: Mercury Disston DA 211 I'm working on, pics

For sure Mike, everyone has their favorite oil and mix ratio and I am a believer in good oil and lots of it...I do not run hot saws but I do build some pretty hot Zenoah rc boat engines....I run Yamalube at 16:1 in all my pre mix 2 strokes..
I think it is kind of a no brainner in the old stuff where parts are not so readily available to use lots of oil....There are some who will say that more oil promotes better ring seal thus helping performance as well......
Dave
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