Toro ProLine 20 HP, Operator'S Manual

Page: 30 / 48

Maintenance
28
Checking the Spark Plug
1. Look at the center of the spark plug(s) (Fig. 21).
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(s).
Always replace the spark plug(s) when it has:
a black coating, worn electrodes, an oily film,
or cracks.
2. Check the gap between the center and side
electrodes (Fig. 21). Bend the side electrode
(Fig. 21) if the gap is not correct.
0.040 in.
(1.02 mm)
2
3
1
m–1870
Figure 21
1. Center electrode insulator
2. Side electrode
3. Air gap (not to scale)
Installing the Spark Plug
(s)
1. Install the spark plug(s) and metal washer. Make
sure the air gap is set correctly.
2. Tighten the spark plug(s) to 20 ft-lb (27 N.m).
3. Push the wire(s) onto the spark plug(s) (Fig. 20).
Cleaning the Cooling Systems
Before each use, check and clean hydraulic and
engine cooling systems. Remove any build–up of
grass, dirt or other debris from the oil cooler screen
and engine air intake. Every 100 hours clean oil
cooler, engine cylinder and cylinder head cooling
fins. Also clean around carburetor, governor levers
and linkage. This will help insure adequate cooling to
hydraulic pumps, motors and engine and will reduce
the possibility of overheating and mechanical
damage.
1. Remove oil cooler from the engine (Fig. 22).
Save all mounting hardware.
2. Blow out fins of oil cooler and area between fins
and screen with compressed air. If area between
screen and fins is tightly packed, remove oil
cooler from screen. Removing two retaining
screws (Fig. 22). Save all mounting hardware.
3. Clean off engine air intake (Fig. 22).
4. Install oil cooler onto engine with previously
removed hardware (Fig. 22).
ÌÌÌÌÌÌÌÌ
ÌÌÌÌÌÌÌÌ
ÌÌÌÌÌÌÌÌ
ÌÌÌÌÌÌÌÌ
ÌÌÌÌÌÌÌÌ
ÌÌÌÌÌÌÌÌ
m–2639
3
1
2
Figure 22
1. Oil cooler screen
2. Oil cooler retaining screw
3. Engine air intake