Cleaning The Blower Housing - Toro 74380 TimeCutter Z4200 Operator's Manual

Note: Due to the deep recess around the spark
plug, blowing out the cavity with compressed air
is usually the most effective method for cleaning.
The spark plug is most accessible when the blower
housing is removed for cleaning.
3. Remove the spark plug and metal washer.
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Figure 27
1. Spark plug and wire location
Checking the Spark Plug
Service Interval: Every 200 hours—Check spark plug
condition and gap.
Every 2 years—Check spark plug
condition and gap.
1. Look at the center of the spark plug (Figure 28).
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.
Important: Never clean the spark plug. Always
replace the spark plug when it has a black
coating, worn electrodes, an oily film, or cracks.
2. Check the gap between the center and side electrodes
(Figure 28). Bend the side electrode (Figure 28) if
the gap is not correct.
Figure 28
1. Center electrode insulator
2. Side electrode
G005070
3. Air gap (not to scale)
Installing the Spark Plug
Service Interval: Every 500 hours—Replace the spark
plug.
1. Install the spark plug. Make sure that the air gap is
set correctly.
2. Tighten the spark plug to 30 ft-lb (41 N-m).
3. Push the wire onto the spark plug (Figure 27).

Cleaning the Blower Housing

Service Interval: Before each use or daily—Check air
intake and cooling areas (clean as
necessary).
Every 100 hours—Clean the blower
housing (more often under extremely
dusty, dirty conditions).
To ensure proper cooling, make sure the grass screen,
cooling fins, and other external surfaces of the engine
are kept clean at all times.
Remove the blower housing and any other cooling
shrouds. Clean the cooling fins and external surfaces as
necessary. Make sure the cooling shrouds are reinstalled.
Torque the blower housing screws to 5.5 ft-lb (7.5 N-m).
Important: Operating the engine with a blocked
grass screen, dirty or plugged cooling fins, and/or
cooling shrouds removed, will cause engine damage
due to overheating.
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