Ravenger 1950 Wood Chipper and Shredder
E&OE
© 2019 Michigan USA
18
Spark Plug
If the spark plug is damaged (cracked insulator, broken or eroded electrodes etc), replace it. •
Always use spark plugs of the correct “heat range” - see
Specifications
.
The spark plug is used to ignite the air/fuel mixture inside the engine. The spark plug has electrodes on
one end and an electrical terminal on the other. The spark plug requires regular maintenance.
Spark Plug Cleaning and Gap Checking
The spark plug should be checked and cleaned as per the maintenance
schedule.
1. Remove any carbon deposits on the spark plug (
A
) electrodes (
B
) with a
wire brush.
2. Clean the spark plug threads and the electrical terminal (
C
) on the top.
To check and adjust the spark plug “gap”:
1. Use “feeler” or “thickness” gauges (
X
) to measure the existing gap. The
gauge must drag a little when being slid between the electrodes (
B
) – this
means the measurement is fairly accurate.
2. Adjust the gap to within specification (see
Specifications
). If the gap needs to be reduced, gently tap
the electrode as required. If the gap needs to be increased, use pliers to gently pull the electrode as
required.
3. Measure the gap again and ensure it is within the specified range before re-installing the spark
plug.
Spark Plug Removal/Installation
1. Pull the electrical lead (
A
) from the terminal on top of
the spark plug. The spark plug is located below and
between the air filter and exhaust cases.
2. Clean the area around the spark plug so that no dirt or
other material can enter the engine when the spark
plug is removed.
3. Use the spark plug tool to remove the spark plug
(rotate left).
To re-install the spark plug:
1. Place the spark plug in its hole and screw it in (rotate right) until “finger tight”.
2. Use the spark plug tool to tighten the spark plug approximately one quarter turn (do not over-
tighten).
3. Place the electrical lead over the spark plug terminal and push it down so that it connects firmly
terminal.
A
B
B
X
C
A
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