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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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OT - Honda lawnmower problem and fix
On Sunday, June 18, 2017 at 2:42:42 PM UTC-4, Jim Wilkins wrote:
wrote in message ... On Sun, 18 Jun 2017 10:10:25 -0400, Bob Engelhardt wrote: On 6/17/2017 8:26 PM, wrote: Why? Blast cleaning is no longer recommended - too easy to get a grain of blast medium where it doesn't belong - doing expensive damage - and plugs are CHEAP!!! I do already have a new plug. The blasting was to see if the soot was the problem. It's your dime, and your time - but you already KNOW the plug was the problem - if you want to know if it was carbon, just wash it with laquer thinners and bake it untill it's white. I do it with my torch - just heat it up with the propane torch until the porcelain tip glows then keep it in the envelope of the flame for a few seconds - comes perfectly clean - and USUALLY restores the function of the plug. Years ago with leaded gas sometimes it would have a yellow or green "glaze: on the insulator that would not burn off, or blast off. Some product of sulpher and lead catalyzed by the silica in the insulator - I believe it was lead sulphide (Germanium) - basically a cheap semiconductor Not to pick on you, but lead sulfide is Galena, the semiconductor used for early "cat's whisker" radio detector diodes. https://en.wikipedia.org/wiki/Cat%27s-whisker_detector Used to see this all the time with Amoco premium in high performance honda engines (mid 1979s). I seriously wish I had known about the Galena connection back then. I would have used the fouled plugs to make radios. Now I'm imagining an episode of Gilligan's Island where the Professor makes a crystal radio out of a lead-glazed spark plug and a coconut... |
#2
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OT - Honda lawnmower problem and fix
"rangerssuck" wrote in message
... On Sunday, June 18, 2017 at 2:42:42 PM UTC-4, Jim Wilkins wrote: wrote in message ... On Sun, 18 Jun 2017 10:10:25 -0400, Bob Engelhardt wrote: On 6/17/2017 8:26 PM, wrote: Why? Blast cleaning is no longer recommended - too easy to get a grain of blast medium where it doesn't belong - doing expensive damage - and plugs are CHEAP!!! I do already have a new plug. The blasting was to see if the soot was the problem. It's your dime, and your time - but you already KNOW the plug was the problem - if you want to know if it was carbon, just wash it with laquer thinners and bake it untill it's white. I do it with my torch - just heat it up with the propane torch until the porcelain tip glows then keep it in the envelope of the flame for a few seconds - comes perfectly clean - and USUALLY restores the function of the plug. Years ago with leaded gas sometimes it would have a yellow or green "glaze: on the insulator that would not burn off, or blast off. Some product of sulpher and lead catalyzed by the silica in the insulator - I believe it was lead sulphide (Germanium) - basically a cheap semiconductor Not to pick on you, but lead sulfide is Galena, the semiconductor used for early "cat's whisker" radio detector diodes. https://en.wikipedia.org/wiki/Cat%27s-whisker_detector Used to see this all the time with Amoco premium in high performance honda engines (mid 1979s). I seriously wish I had known about the Galena connection back then. I would have used the fouled plugs to make radios. Now I'm imagining an episode of Gilligan's Island where the Professor makes a crystal radio out of a lead-glazed spark plug and a coconut... I worked with Detroit engineers and knew the underlying cause but had no way to measure the quality of the spark in a cylinder under a driving load, so I just replaced the plugs if the engine didn't feel right. The little 12V spark plug blaster I bought made them prettier but didn't help the problem for very long. I kept some in the vehicle as temporary spares I could give away to the needy, along with the second headlight or brake bulb when one burned out. -jsw |
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