gonup
Saw Builder
Posts: 132
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Post by gonup on Jul 24, 2019 19:00:02 GMT -5
I recently received a non running Super 1050A and I want to check my seals while I have my saw apart. After I block the intake and exhaust ports how much pressure and vacuum should I apply when testing? I have a mityvac hand pump. I will be using soap solution when pressure testing and watching for bubbles and I guess I will just see if it holds a vacuum. Is this ok?
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Post by rowdy235 on Jul 27, 2019 21:22:59 GMT -5
I believe in order to test with pressure/vacuum you will need to have the saw mostly assembled, with a block plate on the exhaust and intake.
I wouldn't think much more than 5-10psi would be required. Main thing is to watch the bleed off. Kind of like a leakdown test on a cylinder.
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Post by onlyhomelites on Jul 30, 2019 23:34:32 GMT -5
Rowdy nailed it...10 PSI is plenty. Pressure test with the soapy water and if the saw passes that test, move to the vacuum test. In theory the saw should hold vacuum for along time if your block-off plates seal tight.
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Post by edju1958 on Jul 31, 2019 9:04:05 GMT -5
I know an old timer who has been working on saws for close to 50 yrs.He doesn't use those "fancy new fangled gauges".Ho told me this is the way they tested saws back before they used ,or could even affoprd gauges.He blocks off the exhaust,just like we do now,but this is where things get different - he leaves the carb on & packs it with play dough (now you don't jam the play dough down the carb's throat to cause a problem,just enough to give a good seal),then he lights a cigar & blows the smoke into the fuel inlet on the carb.The smoke will tell you if you have a leak & show you exactly where it is.I've never done this,but it does sound interesting. Ed
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Post by onlyhomelites on Aug 2, 2019 11:16:59 GMT -5
Well I suppose that could work, but you'd have to blow a lot of smoke to fill the crankcase!
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Post by edju1958 on Aug 2, 2019 11:28:33 GMT -5
Well I suppose that could work, but you'd have to blow a lot of smoke to fill the crankcase! Yes Leon,one would think that,but that's actually not the case as I understand it.I'll get mopre info on it & post again. Ed
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Post by jselden78 on Aug 2, 2019 19:36:53 GMT -5
I believe there was smoke blown but probably not into the fuel inlet of the carb 😆
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Post by edju1958 on Aug 2, 2019 19:50:40 GMT -5
Just because you've never heard of this method doesn't mean it doesn't work.Too bad some people have such closed minds. Ed
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Post by undee70ss on Aug 2, 2019 20:55:56 GMT -5
I know an old timer who has been working on saws for close to 50 yrs.He doesn't use those "fancy new fangled gauges".Ho told me this is the way they tested saws back before they used ,or could even affoprd gauges.He blocks off the exhaust,just like we do now,but this is where things get different - he leaves the carb on & packs it with play dough (now you don't jam the play dough down the carb's throat to cause a problem,just enough to give a good seal),then he lights a cigar & blows the smoke into the fuel inlet on the carb.The smoke will tell you if you have a leak & show you exactly where it is.I've never done this,but it does sound interesting. Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Ed
Blowing into the fuel inlet would be testing the carburetor, not the crankcase. |
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Post by edju1958 on Aug 2, 2019 21:21:56 GMT -5
As I said before,I'm going to look into this further. Ed
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