7. Hold the rod with one hand and move the wrist pin in all directions
to check for clearance. If there is any noticeable play in this assembly,
replace the wrist pin and bearing and check it again.
8. If no play is now evident, the old connecting rod assembly can be
used with the new wrist pin and bearing.
NOTE: The wrist pin does not have to be replaced as a complete assem-bly, as does the crank pin bearing assembly. The reason is that the crank pin bearing assembly rotates 360 degrees with every revolution of the engine, while the wrist pin merely oscillates back and forth in an arc of less than 30 degrees.Individual components of the wrist pin assembly can be installed to get the proper clearance, as long as the components are in good condition.
TRANSMISSION COMPONENTS AND OPERATION
Operation
1. The two geared shafts in the transmission are the main shaft and
the lay shaft. Power is delivered to the transmission through the
clutch, which is fitted to the left end of the main shaft.
2. There are five gears on the main shaft (Fig-ure 3, next page). One
of these gears can be slid back and forth to engage the gear on its left
by means of small pegs on the sides of the gears. These pegs are called
engaging dogs.
3. The main shaft also has a separate gear en-gaging device called
a sliding dog (see Figure 3).
4. The function of the, lay shaft is to provide a means of changing
gear ratios or shaft speed (see Figure 4). It also has one gear which
can be slid back and forth to engage the gears on either side of it.
