Toro TimeCutter 74780, Руководство оператора

Страница: 31 / 48

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.
Note:
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).
B A
g027479
Figure 32
Installing the Spark Plug
Tighten the spark plug to 20 N-m (15 ft-lb).
Figure 33
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 after finishing the maintenance. 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