Chapter 8. Ignition Systems, Charging Systems Battery Service And Electrical Control Panels; Section 1. Ignition Systems - Tecumseh HH100 Handbook

CHAPTER 8. IGNITION SYSTEMS, CHARGING SYSTEMS
BATTERY SERVICE and ELECTRICAL CONTROL PANELS
SOLID STATE SYSTEM IGNITION SERVICE.
a. General. Follow through the checks and
explanations below, if everything checks ok, then
replace the ignition unit. The parts of the system
are:
1. Ignition coil.
2. Flywheel.
3. Ignition unit.
4. High tension lead.
5. Spark plug.
b. Spark Plug Check. Test ignition by using a test
plug or hold the high tension lead terminal
1/8-in.(3.175 mm) from the spark plug. Crank
the engine over rapidly. If a good blue spark jumps
the gap, the ignition system is functional.
If no spark is present, make the following checks:
c through f.
c. Check high tension lead for a ground or an open
circuit in the ignition unit.
d. Check coil lead and connection to ignition unit
terminal.
CAUTION: If the engine won't run, after previous
acceptable performance, check the equipment ignition
switch.
1/8" (3.175 mm)
GROMMET
IGNITION
UNIT
HIGH
TENSION
LEAD
LONG TRIGGER PIN
SHORT TRIGGER PIN
SET GAP
.006" .152 mm
.010" .254 mm
.187
(4.750 mm)
10 and 20 AMP ALTERNATOR SYSTEMS

SECTION 1. IGNITION SYSTEMS

1/8"
(3.175 mm)
IGNITION
UNIT
TERMINAL
SET GAP
.006" .152 mm
.010" .254 mm
HIGH
LONG TRIGGER PIN
TENSION
LEAD
SHORT TRIGGER PIN
.250
(6.35 mm)
e. Air Gap Checks. Adjust the system so that a
.006/.010'' (.152/.254 mm) clearance exists between
the ignition unit and the long trigger pin in the
flywheel.
To adjust, loosen the retaining screw and move
the unit to find the proper gap.
Follow through the checks and explanations below,
if everything checks ok, then replace the ignition
unit.
REMOVAL OF FLYWHEEL TRIGGER PINS
Removal of damaged pins. CAUTION: Pins must
not be reused. Use care not to damage flywheel.
Never hammer on a flywheel as permanent damage
to the magnets could result.
Use vise-grip pliers to remove the pins. If the pins
are very tight, hammer lightly on the pliers at the
same time pulling on the pins. Do not twist. If a vise
is used to secure the flywheel, use care not to damage.
INSTALLATION OF NEW TRIGGER PINS.
1. Position the flywheel with the fins on a flat surface.
Holes toward you - See Figure.
2. Coat shaft of pins with Loctite.
CAUTION: Do not use a hammer to drive in pins.
3. Use masking tape to cover wide-mouth pliers
(channel lock type) and press fit the short pin
into hole on right. Fit the long pin on the left.
4. Pins must be pressed up to pin shoulder. Wipe
away any excess Locktite.
5. The magneto air gap must now be adjusted to
correct for any changes in trigger pin height.
SHORT PIN
LONG PIN
45