Gas grill on fire ?


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Old 08-27-10, 07:26 AM
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Gas grill on fire ?

Have a Sears/Kenmore gas grill that is about 5 years old. Was grilling the other day and and when I went out there was a flame present underneath which looked like it was at the end of the burner tube where it connects to the piping that leads to the burner adjustment knobs. I shut the grill off and the right knob was very hot an you can see the panel around the kob is discolored. I shut it down and relit it and within about 2 minutes the same thing hppened again. So I shut the right side down and grilled with the left side for another half hour or so and all was fine. Any idea what would cause this. Do I need to change the burners tubes etc. Also is it worth repairing or buying another grill. Not sure how much arts would be. Thanks for the help.
 
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Old 08-27-10, 12:35 PM
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The condition you have is called "flashback."

The gas comes out a small hole called a burner orifice, and is "squirted" inside the burner where it mixes with primary air for combustion. The gas/air mixture should then flow through the burner ports where it should burn on top of the burners.

The gas doesn't burn at the burner orifice or inside the burners because the speed of the burning gas is limited and too fast for the flame to flash back inside the burners.

So the gas speed is slower than it should be, allowing that flashback condition to exist.

Check to see if the burners are properly held in place at the burner orifice. The burners could be plugged or obstructed.
 
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Old 08-28-10, 03:45 AM
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I 'm guessing that you will find a spider web right where the tube from the burner sits on the orifice.
 
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Old 08-28-10, 07:01 AM
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Hello jcraft. Welcome to the Gas Appliances topic.

I agree. Very good chance there is some type of obstruction in the effected burner. Very likely to be a spiders web in the burner tube of the effected burner.

In such cases, remove the effected burner, clear the obstruction(s). Best to due each burner while in the process. Be sure to replace the burner(s) in there exact locations and exactly as there where prior to removal.

While in the process, clear each orifice as explained in preparing outdoor BBQ's for summers usage.

Excerpt:
Outdoor BBQ Prep 4 Summer

Summer is soon to arrive regardless of your local resident area. In preparation for that season, is the time to start preparing for outdoor BBQ'ing...

Regardless of which type of fuel the BBQ uses, if the BBQ is not a charcoal type, below are some handy tips for preparing for a great BBQ cooking season ahead.

First preparation step, remove all briquet's from inside the BBQ. Next, remove the burner or burners. Clean the entire inside of the BBQ.

There are chemicals which can help to clean off last years left over burn ons. I prefer a wire brush, scrapper and some good old fashioned elbow grease. (Physical Work)

Wire brush the burner(s) and rack(s) and flush with water. Clean out the holes or slots in the burner(s). A wire from the brush, large pin, needle or thin wire works best, in my opinion.

Also check inside and down the burner tube. You may find a spider web. If so, a coat hanger wire works to remove it or a bottle brush.

Next item to check is for s spider web inside the orifice. The orifice will be the brass or bronze thimble hex nut the burner tube sits on or over. Use a flash light if needed, to peer down the tiny hole in the center of the orifice.

HINT:
Spider webs inside burners or orifices is the number one cause of low burner flames at the burners or not gas to the burner (s)

If you see a white web or what appears to be a tiny cotton obstruction in the orifice, it's a spiders web. Not uncommon to find spiders in either the burner tube or the orifices.

To remove a web from an orifice, I suggest either removing the orifice or using a pipe cleaner. To effectively remove a web from an orifice, it helps to have the gas to that burner on.

Turn on the valve to the effected burner, insert the pipe cleaner, twirl it around and pull it out. Done correctly, out will come the web or it will be loosened enough to blow out from the gas pressure.

TIP 1:
In some cases it helps to clean off a bit of the pipe cleaners outside covering by burning it off. Than slightly untwist the thinner wire from the thicker one. Insert into orifice, twist and remove. Out should come the web.

If the web does not come out in the above manner, gets pushed down further, orifice removal is required. Use a 7/16 inch open ended wrench. Turn counter-clock wise to remove. Clean and reinstall turning clockwise.

TIP 2:
Helps to count the number of turns it takes to remove the orifice. Reinstall fully till it bottoms out, than unscrew out the number of turns to reset it back to it's original position.

Clean racks using wire brush. Cleaner not recommend but may be used if rinsed well. BBQ cleaner, wire brushes, etc available at most local hardware stores or any appliance parts stores.

TIP 3:
Suggested replacement of briquet's is yearly but may not be depending upon prior usage, physical condition and cleanliness. Cleaning can be done, on some types of briquet's, by washing and drying.

Another method is to incinerate bequests after cleaning and reassembling BBQ. Why not. You need to test the BBQ anyway...

If BBQ parts are required for replacement, write down the bran name, model and serial numbers, visit the local appliance parts store(s) in you area. Bound to have the parts.
 
 

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