Stall-Torque Hook-Up; Bendix Drive; Assembly - Piper Navajo PA-31 Service Manual

KNIFE
CARBON PILE
Figure 11-44. Stall-Torque Hook-up
11-70.
BENDIX DRIVE. The Bendix Drive should be wiped clean with a dry
cloth. The pinion should turn smoothly
in one direction
and should lock in the
other direction.
Replace drive if it fails to check as above or if the pinion teeth
are excessively
worn or damaged.
11-71. ASSEMBLY.
a. When assembling
the starting motor, always use an arbor
press and the
proper bearing arbor for installing
graphitized bronze and roller bearings.
The
Bendix shaft should have a thin film of Lubriplate #777 or equivalent on the Ben-
dix portion of the shaft.
End play should be .005 to .050 of an inch.
b.
New brushes should be properly
seated when installing by wrapping a strip
of 00 sandpaper
around the commutator(with the sanding side out) 1-1/4 to 1-1/2
times maximum.
Drop brushes on sandpaper covered commutator
and turn the
armature slowly in the direction
of rotation. Dust should be blown out of the
motor after sanding.
PIPER NAVAJO SERVICE MANUAL
378
MOTOR
Reissued: 10/12/79
ELECTRICAL SYSTEM
4C22