Replacing The Spark Plugs - Toro Groundsmaster 3500-G Operator's Manual

1. Engine oil filter
3. Add oil to the crankcase; refer to
Engine-Oil Level (page

Replacing the Spark Plugs

Service Interval: Every 400 hours
Replace the spark plugs to ensure proper engine
performance and reduce exhaust emission level.
Use a Champion RC 14YC or NGK BPR 4ES.
1. Clean the area around the spark plugs so foreign
matter cannot fall into the cylinder when you
remove the spark plug.
2. Pull the wires off the spark plugs and remove
the plugs from the cylinder head.
3. Check the condition of the side electrode, center
electrode, and center-electrode insulator to
ensure that there is no damage.
Important:
A cracked, fouled, dirty, or
otherwise malfunctioning spark plug must
be replaced. Do not sand blast, scrape,
or clean electrodes by using a wire brush
because grit may eventually release from the
plug and fall into the cylinder. The result is
usually a damaged engine.
Figure 45
Checking the
37).
1. Air gap at 0.81 mm (0.032 inch)
4. Set the air gap on each plug between the center
and side electrodes to 0.81 mm (0.032 inch).
5. Install the correctly-gapped spark plugs and
tighten them to 24.5 to 29 N-m (18 to 22 ft-lb).
If you cannot use a torque wrench, tighten the
g021414
plugs firmly.
6. Install the spark-plug wires.
39
Figure 46
g005588