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18
Trouble
Engine does not shut off
with manual mixture con-
trol in "IDLE CUTOFF"
position
Continuous fouling of
spark plugs
Engine runs rough at
high speed
Regular missing at
high speed
Sluggish operation
and low power
TABLE VIII
TROUBLE SHOOTING CHART (cont.)
Probable Cause
Mechanism does not permit
poppet valve to close com-
pletely
Linkage
does
not
permit
"IDLE CUTOFF" lever
to
reach "OFF" position
Piston rings not seated
Piston rings excessively worn
Piston ring gaps aligned
Piston rings inverted
Broken piston ring
Mounting bolts of rubber bush-
ings loose
Propeller out of balance
Spark plug gasket leaking, gap
too large or insulator damaged
Ignition cable insulation dam-
aged
Excessively
lean
fuel-air
mixture
Valve spring broken
Valve warped or burned
Hydraulic tappet dirty or worn
Throttle not opening wide
Spark plugs fouled or im-
properly gapped
Carburetor air heat valve open
Incorrect magneto timing
Damaged magneto breaker or
condenser
Remedy
Overhaul carburetor.
Allow approximately 50 hours
of operation for new rings to
seat properly.
Replace.
Space gaps
90
degrees apart,
with oil control ring gap to
the top.
Install with side etched "TOP"
toward piston head.
Replace ring (and cylinder if
damaged).
Tighten bolts or replace bush-
ings.
Remove and repair.
Replace damaged part.
Test for leakage at high volt-
age. Replace damaged cable.
Clean
strainer,
carburetor
screen, carburetor main jet.
Measure flow through supply
line.
Replace.
Top overhaul.
Remove and clean or replace.
Adjust linkage.
Close valve or readjust con-
trol.
Refer to timing instructions
in Section VI.
Refer to paragraph 6-10.
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