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 TM 55-1905-220-14-1
e. When in neutral, (Figure 1-36) all parts that rotate in the marine gear turn at engine speed. The driving ring that is
bolted to the engine flywheel is the connecting member between the engine and the marine gear. The rubber blocks
installed on the drive spider are meshed in the driving ring. The drive spider is spline-connected to the forward clutch
shaft. The gear teeth of the steel clutch plates are meshed with the external gear teeth of the forward clutch shaft.
Therefore, the steel clutch plates of the forward clutch rotate in engine direction at engine speed. The reverse driving
gear is keyed on the taper of the forward clutch shaft. The driving gear meshes with the reverse driven gear which is
keyed to the taper of the reverse clutch shaft. The ratio between the two gears is 1:1. Anti-engine rotation at engine
speed of the reverse clutch shaft is obtained by the meshing of these two gears. The gear teeth of the steel clutch plates
are meshed with the external gear teeth of the reverse clutch shaft. Therefore, the steel clutch plates of the reverse
clutch rotate in anti-engine (or reverse) direction and at engine speed. The oil pump assembly which is connected to the
reverse clutch shaft also rotates in anti-engine direction and at engine speed. Since both forward and reverse clutches
are disengaged, there is no further power flow within the gear.
Figure 1-36. Marine Gear Power Flow-Neutral
1-71
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