Electrical System Repairs; Electrical System Repairs; Spark Plug Replacement - Toro Workman 3000 Series Service Manual

Electrical System Repairs

Spark Plug Replacement

Spark plug type
Spark plug air gap
1. Clean area around spark plugs to prevent foreign ma ­
terial from falling into cylinder when spark plug is re­
moved.
2. Pull spark plug wires off spark plugs and remove
plugs from cylinder head.
NOTE: When disconnecting spark plug wires, be sure to
hold cable cap and not wire. Disconnecting spark plug
wires by holding wire alone can cause damage to wire
and malfunction of ignition system.
3. Check condition of side electrode, center electrode,
and center electrode insulator to assure there is no dam­
age.
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.
4. Set air gap between center and side of electrodes at
.040 in. (1 mm). Install correctly gapped spark plug and
tighten plug to 15 – 20 ft–lb (20 – 30 Nm). If torque
wrench is not used, tighten plug firmly.
5. Install spark plug wires.
Liquid Cooled Gas Engine
Champion RN 16Y
NGK BPR 4ES
1 mm (.040 in.)
Page 3 – 58
Spark plug wire removal
Figure 97
.040"
(1 mm)
Figure 98
Workman 3000/4000 Series