Spark Plug - Desa RM200T Owner's Manual

200,000 BTU/HR
PORTABLE FORCED AIR HEATER
SERVICE
PROCEDURES
Continued

SPARK PLUG

1. Remove upper shell (see Upper Shell
Removal, page 8).
2. Remove fan (see Fan, page 8).
3. Remove spark plug wire from spark
plug (see Figure 12).
4. Remove spark plug and wave spring
washer from burner head using 13/16"
open-end wrench.
5. Clean and regap spark plug electrodes
to .110 gap (see Figure 13).
6. Install spark plug and wave spring
washer in burner head. Torque 40 to
60 inch-pounds. Then adjust (if nec-
essary) to bring side electrode into the
acceptable range (see Figure 14).
7. Attach spark plug wire to spark plug.
8. Replace fan (see Fan, page 8).
9. Replace fan guard and upper shell (see
Upper Shell Removal, page 8)
Wave
Burner
Spring
Head
Washer
Spark
Plug
Figure 12 - Spark Plug Removal
Bend Here to
Adjust Gap
Figure 13 - Spark Plug Gap
Figure 14 - Acceptable Range For Side Electrode
NOZZLE
1. Remove upper shell (see Upper Shell
Removal, page 8).
2. Remove fan (see Fan, page 8).
3. Remove fuel and air line hoses from
burner head.
4. Remove spark plug wire from spark
plug.
5. Remove spark plug from burner head
using 13/16" open-end wrench.
Spark
6. Remove three screws using 5/16" nut-
Plug
driver and remove burner head from
Wire
combustion chamber.
7. Place burner head into vise and
lightly tighten.
Combustion
Chamber
Gap
Screw
Air Line Hose
Figure 15 - Removing Burner Head
Side
Electrode
8.
9.
10. Inspect nozzle seal for damage.
11. Replace nozzle into burner head and
12. Attach burner head to combustion
13. Install spark plug in burner head.
14. Attach spark plug wire to spark plug.
15. Attach fuel and airline hoses to burner
16. Replace fan (see Fan, page 8).
17. Replace fan guard and upper shell (see
Fuel Line Hose
10
270
Acceptable
ACCEPTABLE RANGE
Range For
FOR SIDE ELECTRODE
Side
Electrode
Carefully remove nozzle from burner
head using 5/8" socket wrench (see Fig-
ure 16, page 11).
Blow compressed air through face of
nozzle. This will free any dirt in
nozzle area.
tighten firmly (80-110 inch-pounds).
chamber.
head.
Upper Shell Removal, page 8).
Burner Head
Spark Plug Wire
Wave Spring
Washer
Spark
Plug
270˚
103607