CHECKS AND ADJUSTMENTS (Cont'd)
Initial Ignition
Timing
Disconnect the vacuum advance hose from the
distributor and put a
plug
in
the hose.
Clean and mark the correct timing mark with chalk
or
white paint.
Connect a timing
light to No. 1 cylinder spark plug wire
[A]. Connect a tachometer to the engine.
Start the engine and decrease the idle speed to 750 RPM
to make sure that the centrifugal advance
is
not
operating. Make the adjustment of the initial ignition
timing to
12° BTDC by loosening the 7/16 inch bolt and
rotating the distributor
in
the correct direction.
Check the centrifugal advance for correct operation by
starting the engine and running the engine at
2000 RPM.
If
the ignition timing advances, the centrifugal advance
mechanism is operating correctly. Note the engine speed
when the advance starts and the amount of
total advance.
Stop the engine. Connect the vacuum hose.
CARBURETOR REPAIR
Repair the four screws (Item 1) [B].
Remove the throttle body
(Item 2)
[B]
and the gasket
(Item
3)
[B] from the fuel body (Item 4) [B].
Be
careful not
to cause damage to the
float assembly (Item 5) [B).
Put
a screwdriver against the float axle (Item 6)
[B]
at the
slotted side of the
float hinge and push the axle through
the slotted side of the bracket. Remove the hinge and
remove the float assembly
(Item 5) [B).
Remove the fuel
valve needle (Item 7) [B], the valve seat
(Item
8)
[B]
and the fiber washer (Item 9) [B].
Use
new parts
in
the repair kit to replace the above parts.
The correct
float lever for the carburetor
is
1-1/8
inch to
1-3/16 inch as measured from the machined surface of
the throttle body (inverted) to the top of the
float [C].
Measurement
is
made without the gasket.
Use
a needle nose pliers to bend the lever on the float
body to get the correct float adjustment.
NOTE: If
parts
need replacement and are
not
in
the
carburetor
kit, replace the
carburetor
assembly.
ENGINE DIAGNOSIS AND TESTING
Camshaft Lobe
Lift
Check the lift of each camshaft lobe and make a note of
the readings.
Remove the rocker arm cover.
Remove the rocker arm shaft assembly.
Revised Oct. 97
A
CYLINDER AND DISTRIBUTOR NUMBERING
10000]
,...,®
DISTRIBUTOR
POSITION
COUNTERCLOCKWISE
FIRING
ORDER
-1-2-4-3
PI-02146
B
C-02619
C
Bottom
of
Float
•
Actual Fuel Level
in
,.rburetor
,.{
Carburetor
Bowl
1.1875"
1.1250"
•
fiR
lGa~:lineJ
f
ffj
(t
1.15"
Fuel
~
Idle
"Mounting
+
-7B-8-
Inlet
Adjustment
Flange
Screw
Float
Adjustment
I
A-02902
741, 742, 743, 743DS Bobcat Loader
Service Manual
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