Servicing The Spark Plug; Cleaning The Cooling System - Toro TimeCutter ZS 4200T Operator's Manual

Servicing the Spark Plug

Service Interval: Every 100 hours or yearly,
whichever comes first—Check the
spark plug(s).
Every 200 hours/Every 2 years (whichever
comes first)—Replace the spark plug(s).
Ensure that the air gap between the center and side
electrodes is correct before installing the spark plug.
Use a spark plug wrench for removing and installing
the spark plug and a gapping tool or feeler gauge to
check and adjust the air gap. Install a new spark plug
if necessary.
Type: Champion ® RN9YC or NGK
Air gap: 0.76 mm (0.03 inch)
Removing the Spark Plug
1. Park the machine on a level surface, disengage
the blade-control switch, and move the
motion-control levers outward to the P
position.
2. Shut off the engine, remove the key, and wait
for all moving parts to stop before leaving the
operating position. Allow the engine to cool.
3. Clean the area around the base of the plug to
keep dirt and debris out of the engine.
4. Remove the spark plug
Figure 46
Checking the Spark Plug
Important:
Do not clean the spark plug(s).
Always replace the spark plug(s) when it has a
black coating, worn electrodes, an oily film, or
cracks.
If you see light brown or gray on the insulator, the
engine is operating properly. A black coating on the
insulator usually means the air cleaner is dirty.
Set the gap to 0.75 mm (0.03 inch).
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(Figure 46).
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Installing the Spark Plug
Cleaning the Cooling
System
1. Park the machine on a level surface, disengage
the blade-control switch, and move the
motion-control levers outward to the P
position.
2. Shut off the engine, remove the key, and wait
for all moving parts to stop before leaving the
operating position.
3. Remove the air filter from the engine.
4. Remove the engine shroud.
5. To prevent debris entering the air intake, install
the air filter to the filter base.
6. Clean debris and grass from the parts.
7. Remove the air filter and install the engine
shroud.
8. Install the air filter.
35
Figure 47
Figure 48
ARK
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