34
FLYWHEEL KEYS.
The flywheel key locates the flywheel
to the crankshaft in the proper position. If a flywheel
key is sheared, or partially sheared, the engine will
not start or may be difficult to start.
FLYWHEEL TORQUE.
Torque flywheel to the proper
specification. See the tables in specification section
for the proper torque setting.
Loose lawn mower blades and adapters can contribute
to sheared keys.
REPLACING MAGNETO BREAKER POINTS.
Remove
the nut holding the electrical leads to the screw on
the movable portion of the breaker points.
Remove the screw from the stationary breaker point
and remove point set. Reinstall the new breaker point
set into position and adjust the point gap according
to the specifications. Points must be adjusted, when
the rubbing block of the points is on the highest spot
on the breaker cam.
Clean points by putting lint-free paper between them
and sliding it back and forth. Then open points and
remove paper and any paper fiber remaining between
the point set. Any oil, fingerprints or contamination
will cause the points to burn prematurely.
CONDENSER CHECK.
Check condenser on a good
quality tester, following the test equipment
manufacturers instructions to check capacity and
resistance. Replace condenser if condition is
questionable.
IGNITION COIL.
Inspect the coil for cracks in insulation
or other damage. Make sure electrical leads are intact,
especially where they enter the coil.
Check operation of the coil using an approved tester
following the instructions furnished with the test unit.
If laminations are distorted or damaged, replace. Some
coils are permanently attached to the laminations and
must be serviced as an assembly.
IGNITION TIMING.
Begin procedure by setting the
point gap. This is done by rotating the crankshaft until
the point arm is resting on the high side of the ignition
cam. Set the point gap by loosening the screw on
the movable point, and insert a feeler gauge per
specification. Tighten the screw then recheck the gap.
NON-COMPLIANCE ENGINE
COMPLIANCE ENGINE
KEY
FLYWHEEL
SLEEVE
NOTE:
Use the Tecumseh Master Parts Manual to
determine correct key for the application.
ADAPTER KEY TO FLYWHEEL ASSEMBLY.
When
an adapter is used, place the adapter with its raised
key area in the flywheel keyway before putting the
flywheel on the engine.
STEEL
ALUMINUM
ALLOY
GOLD
SOLID STATE
IGNITION
CRANKSHAFT
TIMING
TABS
FLYWHEEL SLEEVE.
Some engines utilize a sleeve
between the crankshaft and flywheel which acts as a
flywheel key. If this sleeve becomes sheared or
damaged, replace. The flywheel sleeve is pressed
into the crankshaft opening in the flywheel, and should
be flush or slightly below flush from the inside surface
of flywheel before in stalling on crankshaft.
For engines equipped with brake system, a new key
and flywheel are shown. Torque procedures are the
same.
CRANKSHAFT
CAM
ARM
POINTS
PIVOT
SLEEVE TO BE
PRESSED IN
FLUSH
WITH HUB
Summary of Contents for AH520 -
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