8. Seat valve spring
10. Insert, valve seat
11. Valve guide
12. Adjusting Screw
13. Valve lifter
14. Cylinder block
Valve, inlet and exhaust
Figure 3-30. Valves and attaching parts. disassembly, reassembly.
3-26. Idler Gear
(1) Remove the gear cover (para 3-20).
a. General. The idler gear is located in the gear
(2) Remove idler gear shaft retaining screw
case on a shaft mounted in the engine crankcase. It
and remove gear and shaft as an assembly from the
is driven by the crankshaft gear and in turn drives
engine crankcase (fig. 3-31).
the magneto gear and the oil pump gear. The idler
c . D i s a s s e m b l y . Refer to figure 3-31B and
gear shaft is secured in the crankcase by a retaining
disassemble the idler gear and shaft.
screw (A, fig. 3-31).