71-30 Exhaust Weldment
A. Removal
1. Remove engine cowling assembly per § 53-21.
2. Refer to Figure 71-5. Remove hardware securing F173-1 struts to F169-1 exhaust
weldment and engine, and remove struts.
3. Loosen clamp(s) securing (accessory gearbox vent) tubes/hose to exhaust; pull
tubes/hose off of exhaust weldment.
4. Remove fasteners securing exhaust weldment and F173-2 shield (if installed) to
engine exhaust collector and remove shield. Carefully lift exhaust weldment up
and off of F169-2 base flange, and remove exhaust weldment.
5. As required, remove hardware securing base and F577-5 bracket (early R66s) to
exhaust collector and remove base. Install exhaust collector cover.
NOTE
F169-1 exhaust weldment material is Type 321 CRES sheet.
B. Installation
1. Refer to Figure 71-5. If F169-2 base is installed, proceed to step 3. Verify 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.
2. Position F169-2 base, F577-5 bracket (earlier R66s), and F173-2 shield (if installed)
on exhaust collector and install hardware Verify security. Remove excess putty.
3. Position F169-1 exhaust weldment on base and install fasteners securing exhaust
weldment to exhaust collector.
4. Install hardware securing F173-1 struts to exhaust weldment and engine. Special
torque engine tee-bolts per § 20-33.
5. Position engine gearbox vent tubes/hose with clamps over exhaust weldment tube.
Orient clamp screw(s) (and any slight bunching of hose, early R66s) on top within
30°, and tighten clamps. Verify security. As required, position MS21919WCH
clamp(s) over tube/hose and install hardware (and spacer) securing clamps to
engine vertical fireshield (and F577-5 bracket, earlier R66s). Verify security.
6. Install engine cowling assembly per § 53-21.
JUL 2020 Chapter 71 Powerplant Page 71.19
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