Coleman 9993 - Manual (Page 18)

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2. Remove the cooking grates and heat tents and set aside.
Using a screwdriver, remove the single screw holding each
burner tube. Push the burner tube away from the valve until it
clears the valve. Next, lift the burner and remove from the grill.
Repeat for the other burners and set aside (Fig. 53).
Fig. 53
3. Look inside end of venturi tubes for nests, webs or mud.
If present, clean as shown in Step 1, Fig. 52.
4. Inspect and clean the burner if needed.
5. Replace the burners in the operating position.
6. Make sure the venturi is properly positioned on the burner
tube, and that the venturi is properly positioned over the valve
orifice (Fig 54).
Fig. 54
Burner Tube
Venturi
Tube
7. Reinstall the burners, heat tents and the cooking grates.
Valve
Orifice