Contact Points And Condenser (Model 47Pz2 Only); Ignition Timing (Dial Indicator); Ignition Coil (Model 47P22 Only); Ignition Coil (Models 47Pd3.47Pe4. 47Pf5) - Toro GTS 120 Service Manual

IGNITION TIMING (DIAL INDICATOR)
The ignition timing may be more accurately
checked using a dial indicator. Remove the spark
plug wire and spark plug and insert the dial indica-
tor into the spark plug hole. Rotate the engine
crankshaft until the dial indicator registers the pis-
ton at top dead center and "zero" the dial. Connect
one lead of a timing tester to the engine frame. (A
timing tester must be used. An Ohmmeter or con-
tinuity light will not indicate the position of the con-
tact points.) Disconnect the wire at the ignition
switch under the fuel tank and connect the other
tester lead to this wire (Figure 2-6). Slowly rotate
the crankshaft clockwise, as viewed from the out-
put end, until the tester signals the contact points
are opening. If the testersignals between 1.76 mm
(.069
in) and 2.51 mm
(.099
in) of piston travel, as
read on the dial indicator, the engine is properly
timed. If the timing is wrong the flywheel must be
removed and the contact points re-gapped.
Figure 2-6
CONTACT POINTS AND CONDENSER
MODEL 47P22 ONLY
The contact points and condenser do wear out
through use and their performance level is
affected by dust, moisture and corrosion. Inspec-
tion of these components requires removal of the
flywheel.
(See Disassembly Instructions.) With the flywheel
removed, inspect for wear of the cam follower
and burning or pitting of the contact points. The
surface of the contact points should have a grey,
frosted appearance if wearing normally. If the
contact points are cratered or have surface
buildup they should be cleaned or replaced. The
contacts can be cleaned with an electrical sol-
vent and contact point sandpaper. Ensure that all
dust and dirt is removed after sanding. Cratering
of the points indicates the condenser may be
faulty. Verify the condition of the condenser
through tests with an ignition analyzer. If an
analyzer is not available the condenser must be
considered faulty and should be replaced. When
installing new or reconditioned contact points
ensure that the wiring is routed through the channel
in the crankcase housing and under the ignition
coil. FAILURE TO ROUTE THE WIRES PROPERLY
WHEEL AND CAUSE A SHORT CIRCUIT. Adjust
the contact points to .35 mm (.014 in) air gap, using
a feeler gauge, with the cam follower on the high
point of the timing cam (Figure 2-7). Check the tim-
ing using either method previously described. It
may be necessary to readjust the contact point
gap to obtain the timing specification.
MAY ALLOW THE WIRING TO CONTACT THE
Contact Point
Assembly
Condenser
I
Cam
Follower
Figure 2-7
IGNITION COIL
Whenever the flywheel is exposed the ignition
coil condition and air gap should be checked.
Inspect the ignition coil for a cracked casing, loose
laminations, damaged wires and over heating. The
ignition coil air gap is
.38-50
mm (.015-.020 in). A
non-metallic flexible gauge such as shown in the
Special Tools Section should be used. To adjust,
rotate the flywheel magnets away from the igni-
tion coil and loosen the two ignition coil retaining
capscrews. Insert the gauge between the coil
laminations and the flywheel (Figure 2-8).Tighten
the retaining capscrews to hold the adjustment.
Figure 2-8
11-3