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10.
TROU8LESHOOTtNG
The following three conditionts must be fulflled for satisfactory engine start.
1.
The cylinder filled with a proper fuel- air mixture.
2.
Good compression in the cylinder.
3.
Good
spark, properly timed, to ignite the mixture.
The engine cannot be started unless these three conditions are met. There are also other factors
which make engine
start
difficult, e.
8..
a
heavy load on the engine when it is about to start
at low speed, and a high back pressure due to a long exhaust
pipe.
The most common causes
of
engine troubles are given below
:
10-
1
STARTING
DIFFICULTIES
10-1
-
1
FUEL SYSTEM
(1)
No
gasoline in the fuel tank
;
or the fuel cock closed.
(2)
The carburetor is not choked sufficiently especially when the engine is cold.
(3)
Water, dust or
gum
in the gasoline iterfering the fuel flow to the carburetor.
(4)
Inferior grade gasoline or poor quality gasoline not vaporized enough to produce the correct
fuel
-
air mixture.
(5)
The carburetor needle valve is heldopen by dirt
or
gum.
This
trouble can be detected as
the fuel flows out of the carburetor when the engine is idling.(Overflow)
This trouble may be remedied by lightly tapping the float chamber with the grip of
a
screwdriver
or
the like.
(6)
If
the carburetor overflows, excessive fuel runs into the cylinder when starting the engine,
making the fuel-air mixture too
rich
to burn. If this happens, remove the spark plug, and
turn the starting pulley a few turns in order to let the rich fuel-air mixture out
of
the spark
plug hole into the atmosphere. Keep the choke valve open during this operation.
Dry
the spark
plug well, screw it into place, and try to
start
again.
10-
1
-
2
COMPRESSION SYSTEM
If
starting difficultes and loss of power are not due to the fuel system or ignition system, the
followings must be checked
for
possible lack
of
compression.
(1) Engine inside
is
completely dried
up
because
of
a Iong period
of
storage.
(2)
Loose or broken spark plug. This causes a hissing noise made by mixture
gas
running out
(3)
Damaged head gasket
or
loose cylinder head.
A
similar hissing noise is produced during
(4)
-Incorrect Valve clearance
of cylinder in compression stroke during cranking.
compression stroke.
If
the correct compression is not obtained even after remedying the above, disassemble the
engine and check further as follows
:
a) Valve stuck open due to carbon
or
gum
on
the valve stem.
b)
If
the piston rings are stuck
on
the piston, remove the piston and connecting rod from
the engine. Clean
or
replace the parts.
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60
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