Cleaning The Cooling System; Cleaning The Blower Housing - Toro TimeCutter ZS 4200S Operator's Manual

1. Spark plug and wire location
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 0.76 mm (0.030 inch).
1
Installing the Spark Plug
Tighten the spark plug(s) to 22 N-m (16 ft-lb).
1
G014537
Figure 36
2
G008794
Figure 37
16 ft-lb
22 N-m

Cleaning the Cooling System

Clean the air-intake screen from grass and debris before each
use.
1. Disengage the blade-control switch, move the control
levers to the neutral-locked position, and apply the
parking brake.
2. Stop the engine, remove the key, and wait for all moving
parts to stop before leaving the operating position.
3. Remove the air-intake screen, the air-cleaner cover, and
the fan housing.
4. Clean debris and grass from the parts.
5. Install the air-intake screen, air-cleaner cover, and the
fan housing.

Cleaning the Blower Housing

To ensure proper cooling, make sure the grass screen, cooling
fins, and other external surfaces of the engine are kept clean
at all times.
Annually, or every 100 hours of operation (more often
under extremely dusty, dirty conditions), remove the blower
housing, and any other cooling shrouds. Clean the cooling
fins and external surfaces as necessary. Make sure the cooling
shrouds are installed. Torque the blower housing screws to
7.5 N-m (5.5 ft-lb).
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.
31
G010687
Figure 38