Servicing The Spark Plugs - Toro Z Master 3000 SERIES Operator's Manual

Servicing the Spark Plugs

Service Interval: Every 100 hours
Make sure that the air gap between the center electrode and
the side electrode is correct before installing each spark plug.
Use a spark-plug wrench for removing and installing the spark
plugs and a gapping tool/feeler gauge to check and adjust the
air gap. Install new spark plugs if necessary.
Type : NGK ® BPR4ES or equivalent
Air Gap: 0.76 mm (0.030 inch)
Removing the Spark Plugs
Important: The fasteners on the covers of this machine
are designed to remain on the cover after removal.
Loosen all of the fasteners on each cover a few turns so
that the cover is loose but still attached, then go back
and loosen them until the cover comes free. This will
prevent you from accidentally stripping the bolts free
of the retainers.
1. Stop the engine, remove the key, and wait for all moving
parts to stop before leaving the operating position.
2. Disengage the PTO, move the motion-control levers to
the neutral-locked position, and set the parking brake.
3. Remove the hydraulic-unit shroud and the 2 bolts
attached to it (Figure 50). This gives you access to the
front spark plug.
2 1 2
1. Hydraulic-unit shroud
4. Remove the spark plugs.
G012432
Figure 50
2. Loosen these 2 bolts
G008803
5. Install the left-hand hydraulic-unit shroud (Figure 50).
Checking the Spark Plugs
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.
If you see light brown or gray on the insulator, the engine is
operating properly. A black coating on the insulator usually
means that the air cleaner is dirty.
Set the gap to 0.76 mm (0.030 inch).
1
Installing the Spark Plugs
Tighten the spark plugs to 24.4 to 29.8 N-m (18 to 22 ft-lb).
36
Figure 51
2
G008794
Figure 52
Figure 53