SEP 2012 R66 Maintenance Manual Chapter 71 Powerplant Page 71.7
71-11 Preparing Engine for Rolls-Royce Maintenance Facility (continued)
8. Remove A919-0D and A919-2D reducers, and G426-1 switch assembly, from fuel pump.
9. Remove hardware securing F593-3 plate to bottom of engine gearbox and remove plate.
10. Remove hardware securing engine-supplied rear PTO pad cover and remove cover.
Remove bolt, washer, and G732-1 cap securing F018-1 clutch assembly in engine
gearbox and remove clutch assembly.
11. Remove AN815-8D union from engine gearbox TANK VENT port, AN815-8D union or
CV26-77 check valve (early R66s) from OIL OUTLET port, and AN815-10D union from
OIL INLET port. Remove D745-3 pressure switch assembly from engine gearbox.
12. Cut and discard safety wire, remove hardware securing G200-1 mount and G200-2
cover from (top of) engine gearbox, and remove mount and cover. Remove residual
B270-1 sealant.
71-12 Preparing Engine for Helicopter Installation
Refer to R66 Illustrated Parts Catalog (IPC) Chapter 71.
NOTE
Remove protective caps and plugs progressively during procedure
to prevent foreign object contamination.
1. Refer to Figures 71-1 and 71-2. Position G200-2 cover and G200-1 mount on top of
Rolls-Royce engine model 250-C300/A1 accessory gearbox as shown. Install hardware,
standard torque bolts per Section 20-32, and torque stripe per Figure 5-1. Install 0.032-
inch diameter lockwire and safety bolt heads together. Seal cover edges with B270-1
sealant.
2. Install D745-3 pressure switch assembly on front of engine gearbox as shown, special
torque switch per Section 20-33, and torque stripe per Figure 5-1.
3. Install NAS617-10 packing on AN815-10D union and install union in engine gearbox OIL
INLET port. Special torque union per Section 20-33 and torque stripe per Figure 5-1.
CAUTION
Installing CV26-77 check valve incorrectly can destroy oil tank.
4. Install NAS617-8 packing on AN815-8D union or CV26-77 check valve (early R66s; at
straight thread) and install union or check valve (flow arrow to point away from engine)
in engine gearbox OIL OUTLET port. Special torque union or check valve per Section
20-33 and torque stripe per Figure 5-1.
5. Install NAS617-8 packing on AN815-8D union and install union in engine gearbox TANK
VENT port. Special torque union per Section 20-33 and torque stripe per Figure 5-1.
6. Inspect F018-1 clutch assembly splines and verify no evidence of galling. Also, verify
end of thread insert is 0.090 - 0.110 inch inboard from tip of splined end of clutch
housing; contact RHC Technical Support if thread insert position is incorrect. Lubricate
clutch splines using B270-21 protectant. Insert clutch in engine gearbox, and install
G732-1 cap, bolt, and washer at rear PTO pad. Standard torque bolt per Section 20-32
and torque stripe per Figure 5-1.
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