Valve/Tappet Clearance - Toro 500 EFI Service Manual

8. Squeeze the element to remove excess oil.
CAUTION
A torn air filter can cause damage to the engine. Dirt and
dust may get inside the engine if the element is torn. Care-
fully examine the element for tears before and after clean-
ing it. Replace the element with a new one if it is torn.
9. Clean any dirt or debris from inside the filter hous-
ing.
10. Install the air filter and metal hold-down, secure with
the two knobs tightened to 16 N-m (12 ft-lb), and
install the cover. Secure with the four clips.
11. Lower the cargo box.
AIR FILTER HOUSING DRAINS
Inspect and squeeze the "duck bill" drain beneath the
main housing for debris and for proper sealing.
Remove the tube drain and clean out any water, oil, or
debris. Reinstall and secure with the clamp.

Valve/Tappet Clearance


NOTE: The engine must be cold for this procedure.

NOTE: The seat, seat back, seat base, and spark
plug must be removed for this procedure.
1. Remove the spark plug and timing inspection plug; then
remove the tappet covers (for more detailed informa-
tion, see the Engine/Transmission section - Servicing
Top-Side Components).
500
TC033A
700
TC034A
2. Rotate the crankshaft to the TDC position on the
compression stroke.

NOTE: At this point, the rocker arms and adjuster
screws must not have pressure on them.
Feeler Gauge Procedure
Using a feeler gauge, check each valve/tappet clearance.
If clearance is not within specifications, loosen the jam
nut and rotate the tappet adjuster screw until the clear-
ance is within specifications. Tighten each jam nut to 7
ft-lb after completing the adjustment.
CAUTION
The feeler gauge must be positioned at the same angle
as the valve and valve adjuster for an accurate measure-
ment of clearance. Failure to measure the valve clear-
ance accurately could cause valve component damage.
VALVE/TAPPET CLEARANCE
Intake 0.1016 mm (0.004 in.)
Exhaust 0.1524 mm (0.006 in.)
Valve Adjuster Procedure
A. Place the Valve Clearance Adjuster onto the jam
nut securing the tappet adjuster screw; then rotate
the valve adjuster dial clockwise until the end is
seated in the tappet adjuster screw.
B. While holding the valve adjuster dial in place, use
the valve adjuster handle and loosen the jam nut;
then rotate the tappet adjuster screw clockwise
until friction is felt.
C. Align the valve adjuster handle with one of the
marks on the valve adjuster dial.
D. While holding the valve adjuster handle in place,
rotate the valve adjuster dial counterclockwise
until proper valve/tappet clearance is attained.

NOTE: Refer to the specifications in Feeler Gauge
Procedure sub-section for the proper valve/tappet
clearance.

NOTE: Rotating the valve adjuster dial counter-
clockwise will open the valve/tappet clearance by
0.05 mm (0.002 in.) per mark.
E. While holding the adjuster dial at the proper
clearance setting, tighten the jam nut securely
with the valve adjuster handle.
CC007D
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