SEP 2012 R66 Maintenance Manual Chapter 79 Engine Oil System Page 79.3
79-10 Scroll and Fanwheel Assemblies
Refer to R66 Illustrated Parts Catalog (IPC) Figure 79-1.
A. Removal
1. Remove F196-1 fan shaft per Section 65-10.
2. Refer to Figure 79-2. Remove perimeter screws securing F236-1 scroll assembly to
F306-1 box assembly.
3. Remove aluminum tape sealing gaps & joints, or gently pull scroll away from box
assembly and, using a scribe or similar sharp instrument, tear aluminum tape sealing
gaps & joints. Remove scroll, with G174-1 fanwheel assembly inside, up through
frame.
4. Remove hardware securing forward or aft F305-5 inlet to scroll; remove inlet & fanwheel.
Remove damaged aluminum tape from scroll and box assembly.
B. Installation
1. Refer to Figure 79-2. Observing “AFT” orientation marking on fanwheel plate, place
G174-1 fanwheel assembly inside F236-1 scroll assembly accordingly. Position F305-5
inlets on scroll and install hardware. Verify security.
2. Lower scroll, with fanwheel inside, through frame and install hardware securing scroll
to F306-1 box assembly. Verify security. Seal gaps & joints using A701-1 aluminum
tape.
3. Install F196-1 fan shaft per Section 65-10.
79-11 Fanwheel-to-Inlet Gaps
A. Measuring Gap
1. Remove tailcone cowling assembly per Section 53-23.
2. Refer to Figure 79-2. Verify 0.10 inch minimum gap between G174-1 fanwheel
assembly and forward and aft F305-5 inlets. Check gap all the way around; rotate
fanwheel and check gap again (several positions). If gap is within limits at forward
and aft inlets, no further action is required.
3. Verify proper tail rotor driveline shimming per Section 65-30.
4. Trim inlets as required per Part B.
5. Install tailcone cowling assembly per Section 53-23.
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