71-12 Preparing Engine for Helicopter Installation (continued)
15. h. Install (2) MS21919WCH4 clamps around harness assembly and install clamps on
(bottom of) engine gearbox. Install hardware, special torque nuts per Section 20-
33, and torque stripe per Figure 5-1.
i. Stand-off ty-rap G426-1 (fuel differential pressure) switch assembly’s wire from
F741-1 line assembly using MS3367-4-9 ty-raps. Connect switch wire to harness
at connectors. Install (2) MS3367-5-9 ty-raps to secure connectors to harness.
Cinch ty-raps until snug without overtightening and trim tips flush with heads.
j. Install harness wire terminal on ignition exiter box stud. Install hardware, special
torque nut per Section 20-33, and torque stripe per Figure 5-1.
k. Connect harness plug to engine magnetic plug on bottom of engine gearbox. Verify
plug security.
16. Refer to Figure 71-4. Verify F169-2 (exhaust) base and engine exhaust collector
mating surfaces are clean and dry, and lay 0.25 inch bead 7020-3 ceramic putty on
top of exhaust collector flange. Position F169-2 base and F577-5 bracket on exhaust
collector and install hardware. Verify security. Remove excess putty. Install exhaust
protective cover.
17. Refer to Figure 76-1. Install F147-1 (minimum throttle stop) screw in fuel control
unit, special torque screw per Section 20-33, and torque stripe per Figure 5-1. Install
D930-2 spring.
18. Install (2) A215-016 o-ring and NAS617-12 packing on F170-1 fitting and install fitting
in engine gearbox OB VENT port. Special torque fitting per Section 20-33 and torque
stripe per Figure 5-1. Position A785-36 hose and B277-8 clamp over fitting and tighten
clamp. Verify security. Position (2) MS21919WCH14 clamps over hose and install
and tighten hardware securing clamps to engine vertical fireshield and F577-5 bracket.
Verify security.
SEP 2012 R66 Maintenance Manual Chapter 71 Powerplant Page 71.9
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