Spark Plug

Combustion

Spark Plug

 

 

 

Mounting Nut

 

 

 

(35/50 Models)

Chamber

Burner

Spark

 

1.

Remove upper shell (see page 12).

 

Strap

 

Spark Plug

 

 

Plug

2.

Remove fan (see page 12).

 

 

 

 

Cable

3.

Remove fuel and air line hoses

 

 

 

 

 

 

from nozzle assembly.

 

 

 

 

 

4.

Remove spark plug cable from

 

 

 

 

 

 

spark plug.

 

 

 

 

 

5.

Remove two screws using 5/16"

 

 

 

 

 

 

nut-driver and remove burner strap.

 

 

Nozzle Assembly

6.

Place hex-body of spark plug into

 

 

 

 

 

 

vise and tighten.

 

Air Line

 

Fuel Line Hose

7.

Remove spark plug mounting nut

 

Hose

 

 

 

 

using 11/16" open-end wrench.

 

Figure 17 - Spark Plug Removal, 35/50 Models

 

8.

Remove burner strap from spark

 

 

 

 

 

 

 

 

plug.

 

 

 

Bend Here

9.

Clean and regap spark plug

 

 

 

 

 

 

to Adjust

 

electrodes to .055" (1.4 mm) gap.

 

 

 

 

 

 

 

Gap

 

10. Replace burner strap onto spark

 

 

 

 

 

 

plug. Rotate burner strap to

 

.055" (1.4 mm) Gap

 

 

position spark plug electrodes as

 

 

 

 

 

 

 

 

 

shown in Figure 19.

 

Figure 18 - Spark Plug Gap, 35/50 Models

 

11.Tighten spark plug with spark plug mounting nut.

12. Release hex-body of spark plug

45°

Burner

Strap

from vise.

 

 

 

13. Replace burner strap onto combus-

 

 

tion chamber.

 

 

14. Attach spark plug cable to spark

 

 

plug.

 

 

15. Attach fuel and air line hoses to

 

 

nozzle assembly.

 

 

16. Replace fan (see page 12).

 

 

17. Replace fan guard and upper shell.

Figure 19 - Spark Plug Rotation, 35/50 Models

Spark Plug

Burner

 

(70/100/150 Models)

 

Head

Spark Plug

1.

Remove upper shell (see page 12).

 

 

Cable

2.

Remove fan (see page 12).

 

 

 

3.

Remove spark plug cable from

 

 

 

spark plug.

 

 

4.

Remove spark plug from burner

 

Spark

 

head using 13/16" open-end

 

Plug

 

wrench.

 

 

5.

Clean and regap spark plug elec-

Figure 20 - Spark Plug Removal, 70/100/150 Models

 

trodes as follows:

 

 

 

 

70/100 Models = .055" (1.4 mm) gap

 

Bend Here

 

150 Model = .075" (1.9 mm) gap

 

 

 

to Adjust

6.

Install spark plug in burner head.

 

 

Gap

 

 

 

7.Attach spark plug cable to spark plug.

8.Replace fan (see page 12).

9. Replace fan guard and upper shell.

Gap

Figure 21 - Spark Plug Gap, 70/100/150 Models

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Desa owner manual Spark Plug Removal, 35/50 Models

50 specifications

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