Replacing Spark Plugs - Toro 07360 Operator's Manual

1. Engine oil filter
4. Add oil to crankcase, refer to Check Engine Oil.

Replacing Spark Plugs

Service Interval: Every 400 hours
Replace spark plugs to assure proper engine performance
and reduce exhaust emission level.
Correct spark plug to use is a Champion RC 14YC or
NGK BPR 4ES.
Recommended air gap is .032".
Note: The spark plug usually lasts a long time; however,
the plug should be removed and checked whenever the
engine malfunctions.
1. Clean area around spark plugs so foreign matter
cannot fall into cylinder when spark plug is removed.
2. Pull spark plug wires off spark plugs and remove
plugs from cylinder head.
3. Check condition of side electrode, center electrode,
and center electrode insulator to assure 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.
1. Air gap at .032"
Figure 49
Figure 50
4. Set air gap between center and side of electrodes at
.040". Install correctly gapped spark plug and tighten
plug to 18–22 ft–lb. If torque wrench is not used,
tighten plug firmly.
5. Install spark plug wires.
42