Servicing The Spark Plugs; Fuel System Maintenance; Inspecting Fuel Lines And Connections; Replacing The Fuel Filter - Toro 12004TC Twister 1600 Operator's Manual

6. Pour oil into the fill opening until the oil level
is up to the Full mark on the dipstick. Add the
oil slowly and check the level often during this
process. Do not overfill.
7. Install the oil fill cap and dipstick firmly in
place.
8. Connect the spark plug wires and battery
cables.
Changing the Oil Filter
Replace the oil filter every 100 operating hours or
yearly, whichever occurs first.
1. Drain the oil from the engine; refer to
Changing the Oil.
2. Remove the existing oil filter (Figure 35).
3. Apply a light coat of clean oil to the new filter
gasket.
4. Screw the new filter on until the gasket
contacts the mounting plate, then tighten the
filter an additional 1/2 to 3/4 turn further. Do
not overtighten.
5. Fill the crankcase with the proper type of new
oil.
6. Start and run the engine to check for leaks.
7. Stop the engine and check the oil level. Add
oil if necessary.

Servicing the Spark Plugs

Replace the spark plugs after every 800 operating
hours or yearly, whichever occurs first, to ensure
proper engine performance and reduce the exhaust
emission level.
Type: Champion RC 14YC (or equivalent)
Air Gap: 0.030 inch (0.762 mm)
Note: The spark plugs usually lasts a long
time; however, the plugs should be removed and
checked whenever the engine malfunctions.
1. Clean the area around the spark plugs so that
foreign matter cannot fall into the cylinder
when the spark plug is removed.
2. Pull the spark plug wires off of 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 (Figure 36).
Figure 36
1. Center electrode insulator
2. Side electrode
Important: A cracked, fouled, dirty,
or malfunctioning spark plug must be
replaced. Do not sandblast, scrape, or
clean the 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 the air gap between the center and side
electrodes at 0.030 inch (0.762 mm) (Figure 36).
5. Install the correctly gapped spark plug and
tighten the plug to 18-22 ft-lb (24-30 N⋅m). If
a torque wrench is not used, tighten the plug
firmly.
6. Install the spark plug wires.
Fuel System
Maintenance
Inspecting Fuel Lines and
Connections
Check the fuel lines and connections every 400
operating hours or yearly, whichever occurs first.
Inspect them for deterioration, damage, or loose
connections.

Replacing the Fuel Filter

Replace the fuel filter every 800 operating hours
or yearly, whichever occurs first.
1. Raise the box and support it with the prop rod.
2. Place a clean container under the fuel filter.
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3. Air gap (not to scale)