Question about Char-Broil Commercial Stainless Steel Grill

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Gas Grill Burners with yellow flames coming from beneath them

I've got a Char-Broil Commercial Series LPG grill, model #463240904. All 3 cast-iron burners had massive yellow flames near their back ends. At first I thought the flames were coming from the burners' side edges, where rust had eaten away enough metal to connect up to 4 side burner holes on each burner.

Today I patched the rust holes along the side edges on all 3 burners with standard JB-Weld (company rates product for 600 degrees). After the J-B Weld set I drilled new side holes, matching the diameter of the ''normal'' holes nearby (The holes get larger going from front to back along the sides).

When I put the burners back in the grill and fired it up I had the same large yellow flames near the back ends of all 3 burners. Looking closer I saw that the flames were actually coming from BENEATH the burners, not out the side holes. Each burner has a slot on the undersuface about 3'' from the back end, extending across the entire width of the burner. The slots looked ''normal'' to me, not a series of holes connected by rust damage. So much LPG is flowing out these slots that the flames come out each side of the burners about 3 times the length of the blue flames coming out the side holes. The gas flow is too great for the oxygen supply, so the flames are yellow. We're going through LPG like crazy, which I'm assuming is due to the LPG flowing out the undersuface slots that run the full width of the burners and are almost 3 times wider than the largest side holes near the back end of the burners.

My questions are:
1) Are there supposed to be slots beneath the burners that span the entire burner width, or are there supposed to be a series of small round holes like the ones along each side edge?
2) I don't know if the slots have to be present for ignition of LPG at start-up. If I seal the slots with J-B Weld and don't drill holes like I did along the side edges, will the burners function properly with only the side holes?
3) If the under-surface slots are sealed, is there any danger of excessive back-pressure in the burners causing a flashback of flames back to the venturis at the front ends of the burners?

Thanks in advance for anybody with any ideas and/or experience with yellow flames shooting out these slots.

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The flames should be blue and the burners clean. check gas pressure and the air mixture dampers. touch air will give you the same effect. if the burners are clean, it is the mixture. as far as the slots in the bottom. i have not seen that. but i work on commercial ranges.

Posted on Feb 27, 2017

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SOURCE: trying to clean the burners assembly

I found this pin. It's on the bottom of the burner on the back end. You have to slide your hand under the burner between it and the flang of the bottom of the grill. It's a messy and difficult thing to remove. Somehow I was able to wiggle and pull it out with my fingers, assisted by a screwdriver and needle-nose pliers. It was a huge pain the a$$ but I was able to get the three burners free and get a coat hanger in there to clean them.

Because of the bottom of the grill there was no clear visible access to these pins. You have to operate blind with just your fingers and the tools. Good Luck!

Posted on Aug 10, 2009

cadesertmax
  • 274 Answers

SOURCE: My grill burners burn unevenly and usually too high. Adjustment?

If this is a natural gas grill, check to see if it has a regulator on the gas line. If it does not, you can install a regulator to reduce the gas flow.

Posted on Jan 10, 2010

  • 2264 Answers

SOURCE: repairing the burners on a char broil commercial grill

well the burners may have fell of the injectors and the gas is missing the burners try re fitting the burners back on , if not you may have a broken gas line .

Posted on Jun 09, 2012

6ya6ya
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Posted on Jan 02, 2017

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