MD Helicopters 369 Series, Manual

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CSP−HMI−2
MD Helicopters, Inc
.
MAINTENANCE MANUAL
Page 410
Revision 32
63−10−00
(c). Insert a long 3/8 inch (9.525 mm) hex
wrench, approximately 10 inches
(25.4 cm) long, through tool and into
back of clutch assembly.
(d). While holding internal hex wrench
[3/8 inch (9.525 mm)], turn external
hex wrench [1.00 inch (2.54 cm)]
counter−clockwise to remove bolt
from back of clutch.
(3). Remove coupling bolt, clutch coupling
and shims.
(4). Remove retaining ring from clutch
housing. Then pull complete clutch
subassembly out of housing.
B. Overrunning Clutch Subassembly
Installation
Consumable Materials
(Ref. Section 91 − 00 − 00)
Item Nomenclature
CM111 Grease, aircraft
CM125 Oil
CM126 Oil, turbine
(1). Remove shipping plug and O−ring from
end of shaft in replacement clutch
subassembly.
(2). Drain preservative oil from clutch
subassembly by inverting it several
times. Add lubricating oil (CM125 or
CM126) (Ref. Sec. 12−00−00).
(3). Coat clutch splines with grease
(CM111).
(4). Using care to avoid oil spillage, insert
clutch subassembly into clutch housing
and install retaining ring with beveled
side outward.
(5). Check fluid level of clutch assembly
before installing clutch coupling (Ref.
Sec. 12−00−00).
(6). For 369F5450 clutch installation:
(a). Remove power output shaft cover
plate from back of engine (Ref. Sec.
01−00−00, Allison Engine Operation
and Maintenance Manual).
(b). Install O−rings on 369F5469
(C30/C47 engine) or 369F5468 (C20
series engines) bolt (Ref. Figure 404).
NOTE:
Fill all voids and gaps between the out-
side of bolt and inside of engine shaft with
grease.
(c). Lubricate internal spline area of
engine output shaft with grease
(CM111).
(d). Lubricate bolt threads with anti−
seize compound (CM112) and insert
through engine into overrunning
clutch assembly.
(e). Using bolt removal tool (Ref.
Figure 405) either hold output
coupling to prevent overrunning
clutch from turning or insert hex
wrench through bolt to engage and
hold clutch.
(f). Torque bolt to 250 − 300 inch−
pounds (28.25 − 33.90 Nm) plus
drag torque .
(g). Using existing hardware, reinstall
power output shaft cover plate on
back of engine (Ref. Sec. 01−00−00,
Allison Engine Operation and
Maintenance Manual).
(h). Lubricate coupling bolt threads with
anti−seize compound (CM112).
(7). Install clutch coupling, shims and
coupling bolt.
(8). Install main transmission drive shaft.
8. Overrunning Clutch − to − Firewall Seal
The overrunning clutch−to−firewall seal
consists of a stamped steel backing and a seal
bonded to the cupped diameter of the backing.
9. Overrunning Clutch − to − Firewall Seal
Replacement
(Ref. Figure 403)
(1). Remove engine.
(2). Remove three bolts, six washers and
three nuts that attach firewall seal to
overrunning clutch.
(3). Position replacement clutch−to−firewall
seal assembly on flange of clutch with