Desa 90, 70 owner manual Spark Plug Removal, 30,000 BTU/Hr Model

Spark Plug

(30,000 BTU/Hr Model)

1.Remove upper shell (see page 10).

2.Remove fan (see page 19).

3.Remove fuel and air line

hoses from nozzle assembly.

4.Remove spark plug wire from spark plug.

5.Remove two screws using 5/16" nut-driver and remove burner strap.

6.Place hex-body of spark plug into vise and tighten.

7.Remove spark plug mounting nut using 11/16" open-end wrench.

8.Remove burner strap from spark plug.

9.Clean and regap spark plug electrodes to .055"

(1.4 mm) gap.

10.Replace burner strap onto spark plug. Rotate burner strap to position spark plug electrodes (see Figure 17).

11.Tighten spark plug with spark plug mounting nut.

12.Release hex-body of spark plug from vise.

13.Replace burner strap onto combustion chamber.

14.Attach spark plug wire to spark plug.

15.Attach fuel and air line hoses to nozzle assembly.

16.Replace fan (see page 19).

17.Replace fan guard and upper shell.

12

Combustion

Chamber

Spark Plug	Burner
Mounting Nut
	Strap Spark
	Plug Spark Plug
	Wire

Nozzle

Assembly

Air Line	Fuel Line
Hose	Hose

Figure 15 - Spark Plug Removal, 30,000 BTU/Hr Model

Bend Here to Adjust Gap

.055" (1.4 mm) Gap

Figure 16 - Spark Plug Gap, 30,000 BTU/Hr Model

Burner

BurnerStrap

Strap

Figure 17 - Spark Plug Rotation, 30,000 BTU/Hr Model Only

099606