TM 5-3895-346-14
ENGINE DRIVE SHAFT FLEXIBLE COUPLING
ENGINE OVERHAUL
ENGINE DRIVE SHAFT FLEXIBLE COUPLING
The engine drive shaft, flexible coupling (Fig. 1) is of the spring- loaded type having a splined hub to match
with the splines on the trans- mission drive-line shaft used on certain applications. The coupling, bolted to the
engine flywheel, serves as a drive and also dampens out torque fluctuations between the engine and the
transmission.
Figure 1. Engine Drive Shaft
Flexible Coupling
Remove Coupling (Transmission Removed)
Remove the eight 3/8-16 x 7/8-inch long bolts which attach the coupling to the flywheel and remove the
coupling.
Inspection
Wash the coupling in clean fuel oil and dry it with compressed air. Check for broken or worn springs. Springs
may be replaced by removing the six bolts, lockwashers, nuts, and spacers holding the two plates together and
removing the smaller plate. After replacing the springs, bolt the plates together and tighten the nuts to 25-30 lb
ft (34-41 Nm) torque.
Examine the hub splines for wear and check the flatness of the mounting plate (the plate which bolts to the
flywheel). Since the plates, spacers, and hubs are manufactured in matched sets, worn hubs or plates cannot
be replaced individually, but must be replaced by a complete, flexible coupling assembly.
Install Coupling
Align the boltholes in the coupling with the tapped holes in the flywheel. Since one bolthole is offset, the
coupling can be attached in only one position. Install the eight 3/8-16 x 7/8-inch long bolts and tighten them
securely.
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