O.S. Engines FL-70 - Manual (Page 18)

34
VALVE ADJUSTING
Valve clearances are correctly set before any
O.S. engine leaves the factory and, in normal
use, will seldom require adjustment. However,
if, after a considerable amount of running time,
a loss of power is detected, or if he engine has
been disassembled for repair, these
clearances should be checked and reset as
necessary.
For checking and adjusting the valve
clearances, a VALVE ADJUSTING TOOL KIT
is available as an optional accessory.
• Feeler gauge 0.04mm
The kit comes in a plastic case and includes:
(Code No.72200060)
• Feeler gauge 0.1mm
• Hex. key 1.5mm
• Wrench 5mm
35
HOW TO SET THE CAMSHAFT TIMING
When replacing the camshaft, set the timing as
follows.
Secure propeller. 1.
NOTE:
If propeller is not secured, crankshaft may
move backward and correct timing cannot
be set.
Turn the crankshaft so that 'T' mark on the
drive hub may match crankcase center line.
(This is engine T.D.C. position) 2.
Push the camshaft into camshaft housing
until it stops. Locate ' ' mark on the side of
camshaft gear in line with the push rod. 3.
Rotate crankshaft right and left a little and
make sure that the ' ' mark on the gear is in
line with the push rod when the ' T ' mark on
the drive hub matches the crankcase center
line. 4.
Secure cam cover with screws. 5.
The relation of position between ' ' mark of
the gear and teeth may differ from the sketch,
by each model.
Fig.1
Fig.2
' ' mark
camshaft
crankcase
center line
'T' mark on
the drive hub
' ' mark of the
camshaft gear
in line with
the push rod