79-11 Fanwheel-to-Inlet Gaps (continued)
B. Trimming Inlets
1. Refer to Figure 79-2. Remove hardware securing F305-5 inlets to F236-1 scroll
assembly.
2. If inlets are slotted, carefully twist inlets over F196-1 fan shaft and remove inlets. If
inlets are not slotted, remove hardware securing fan shaft to C947-3 plate assemblies,
noting hardware removed, and remove inlets.
3. Refer to Figure 79-2, Detail A. Trim inlets as required to meet minimum fanwheel-
to-inlet gap. Do not exceed minimum inlet dimensions.
4. Refer to Section 20-70. Smooth inlet edges and coat bare metal with primer. Touch-
up primed area using dark gray Dupont Imron polyurethane enamel in accordance
with paint manufacturer’s recommendations.
5. If inlets are slotted, carefully twist inlets over fan shaft and install hardware securing
inlets to scroll assembly (slot orientation is optional). Verify security.
6. If inlets are not slotted, install inlets around fan shaft and install hardware securing
inlets to scroll assembly. Verify security. Install hardware securing fan shaft to
plate assemblies, standard torque nuts and palnuts per Section 20-32, and torque
stripe per Figure 5-1.
7. Measure fanwheel-to-inlet gaps per Part A. Repeat procedure as required for minimum
0.10 inch gap at forward and aft inlets.
79-20 Oil Tank Assembly
Refer to R66 Illustrated Parts Catalog (IPC) Figure 79-5.
A. Removal
1. Drain engine oil per Section 12-60.
2. Remove tailcone cowling assembly per Section 53-23. Open main rotor gearbox
compartment access door.
3. Refer to Figure 79-3. Cut and discard safety wire securing tube to G689-1 oil tank
assembly scupper drain. Pull tube off of drain.
4. Disconnect harness assembly plug from MS28034-1 oil temperature sender (located on
inboard side of tank).
5. Remove hardware securing line assembly clamps.
6. Loosen F723-1, F723-3, and F723-4 line assembly B-nuts from engine, F649-1 oil
cooler, and tank fittings; disconnect lines from tank fittings and plug lines.
7. Remove nuts securing tank fittings to firewall.
8. Remove hardware securing tank tabs to F384-3 angles. Remove tank through access
door and cap fittings.
SEP 2012 R66 Maintenance Manual Chapter 79 Engine Oil System Page 79.5
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