Spark Plug - Toro 74216 Operator's Manual

13. Check for any leaks in the cooling system.
14. Close engine cover and tilt seat back.
Important Check level of coolant after the first 8
hours of operation, following changing coolant.
1
2
Figure 43
1. Radiator cap
Cooling System Inspection
Inspect the radiator and the hoses initially and after first 8
hours.
Inspect the radiator and the hoses every 200 hours.
1. Check hoses and radiator for cracks, dents and
fractured seams. Repair or replace damaged hoses or
radiator.

Spark Plug

Check the spark plug(s) after every 100 operating hours.
Make sure 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(s) and a gapping tool/feeler gauge to check and
adjust the air gap. Install a new spark plug(s) if necessary.
Type: NGK BMR 4A (or equivalent) Air Gap: 0.026 in.
(0.65 mm)
Removing the Spark Plug
1. Disengage the power take off (PTO) and turn the
ignition key to "OFF" to stop the engine. Move levers
to neutral locked position and apply parking brake.
Remove the key.
2. Clean around the spark plug(s) to prevent dirt from
falling into the engine and potentially causing damage.
Pull the wire(s) off the spark plug(s) (Fig. 44).
2. Antifreeze overflow bottle
(s)
35
3. Remove the spark plug(s) and metal washer.
Figure 44
1. Spark plug wire
Checking the Spark Plug
1. Clean the electrodes by scraping or with ba wire brush
to remove carbon deposits and wetness (Fig. 45).
2. Inspect spark plug (Fig. 45).
Important
Always replace the spark plug(s) when it
has: a black coating, worn electrodes, an oily film, or
cracks.
3. Check the gap between the center and side electrodes
(Fig. 45). Bend the side electrode (Fig. 45) if the gap is
not correct.
2
1
Figure 45
1. Center electrode insulator
2. Side electrode
Installing the Spark Plug
1. Install the spark plug(s). Make sure the air gap is set
correctly.
2. Tighten the spark plug(s) to 17 ft-lb (23 N.m).
3. Push the wire(s) onto the spark plug(s) (Fig. 44).
2
1
2. Spark plug
3
0.024 –
0.028in.
(0.6
0.7mm)
m–3215
3. Air gap (not to scale)
(s)