Alternator; Air Gap Setting - Tecumseh SPECTRA 37 Service And Repair Manual

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Maintenance instructions for sealed batteries
- Store battery in dry and ventilated area, disconnecting
the battery from the wiring harnesses.
- Avoid storing discharged batteries. It is extremely
important that it is fully charged before storing.
- If battery has discharged, it should be put immediately
on recharge.
- Use only the charger supplied with the battery, or one
with the following features:
- maximum current output 100-200 mA at 15 Volts DC.
- Before prolonged lawnmower storage, disconnect battery
from engine wiring harnesses and ensure battery is
fully charged.
- Avoid shorting battery terminals. The high current
delivered by batteries can overheat and destroy the
insulation and internal connections.
b) ALTERNATOR
A single coil alternator is fitted alongside the ignition coil
(Fig 30) and utilises the same flywheel magnets as the
ignition coil. The air gap is 0.30 mm and is set in
conjunction with the HT coil assembly. The alternator has
an output of 325-350 mA at 3000 rpm which is sufficient
to keep the battery charged under normal working
conditions.

Air gap setting

Loosen all lamination screws, turn flywheel so magnet is
centred across from solid state module using air gap
gauge, part no. 26990003 (gauge for 0.30 mm air gap).
Tighten ignition coil screw (right side). Rotate flywheel
and repeat procedure setting 0.30 mm air gap between
alternator coil laminations and magnet. Tighten all alternator
screws
To check the system, remove the plastic connector
housing by inserting a small bladed screwdriver or similar
device to release the spade connector. (Fig 31).
Connect one probe of a continuity meter to the lead of
the alternator, the other probe to an unpainted surface on
the engine for ground. Reverse the meter probes. If
continuity exists in both probe positions, the alternator
assembly must be replaced. (Continuity should exist in
one of two probe positions only). If there is no continuity
in both probe positions, the assembly must be replaced.
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Fig. 30
Fig. 31