71-30 Exhaust Weldment
Refer to R66 Illustrated Parts Catalog (IPC) Figure 71-13.
A. Removal
1. Remove engine cowling assembly per § 53-21.
2. Refer to Figure 71-4. 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 three fasteners securing exhaust weldment to engine exhaust collector.
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.
B. Installation
1. Refer to Figure 71-4. 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 and F577-5 bracket (early R66s) on exhaust collector and install
hardware. Verify security. Remove excess putty.
3. Position F169-1 exhaust weldment on base and install three 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 (accessory gearbox vent) tubes/hose with clamp(s) over exhaust weldment
vent tube. Orient clamp screw(s) (and any slight bunching of hose, early R66s) is on
top within 30°, and tighten clamp(s). Verify security.
6. Install engine cowling assembly per § 53-21.
MAY 2015 Chapter 71 Powerplant Page 71.15
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