Servicing The Spark Plug - Toro 74177 Operator's Manual

Changing the Oil Filter
Replace the oil filter every 200 hours or every other oil
change.
Note: Change the oil filter more frequently when operating
conditions are extremely dusty or sandy.
1. Drain the oil from the engine; refer to Changing the Oil,
page 30.
2. Remove the old filter and wipe the filter adapter
(Fig. 37) gasket surface.
3. Pour new oil of the proper type in through the center
hole. Stop pouring when the oil reaches the bottom of
the threads. Allow a minute or two for the oil to be
absorbed by the filter material.
4. Apply a thin coat of new oil to the rubber gasket on the
replacement filter (Fig. 37).
1
Figure 37
1. Oil filter
2. Gasket
5. Install the replacement oil filter to the filter adapter.
Turn the oil filter clockwise until the rubber gasket
contacts the filter adapter; then tighten the filter an
additional 1/2 turn (Fig. 37).
6. Fill the crankcase with the proper type of new oil; refer
to Servicing the Engine Oil, page 30.

Servicing the Spark Plug

Check the spark plug(s) after every 200 operating hours.
Make sure that 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: Champion RC12YC (or equivalent)
Air Gap: 0.030 inch (0.76 mm)
Removing the Spark Plug
1. Disengage the power take off (PTO), set the parking
brake, stop the engine, and remove the key.
3
2
m–1256
3. Adapter
(s)
31
2. Pull the wire(s) off of the spark plug(s) (Fig. 38). Clean
around the spark plug(s) to prevent dirt from falling into
the engine and potentially causing damage.
3. Remove the spark plug(s) and metal washer.
2
Figure 38
1. Spark plug wire
Checking the Spark Plug
1. Look at the center of the spark plug(s) (Fig. 39). If you
see light brown or gray on the insulator, the engine is
operating properly. A black coating on the insulator
usually means the air cleaner is dirty.
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.
2. Check the gap between the center and side electrodes
(Fig. 39). Bend the side electrode (Fig. 39) if the gap is
not correct.
2
1
Figure 39
1. Center electrode insulator
2. Side electrode
Installing the Spark Plug
1. Install the spark plug(s). Make sure that the air gap is
set correctly.
1
m–4089
2. Spark plug
3
0.030 inch
(0.76 mm)
m–3215
3. Air gap (not to scale)
(s)