79-22 Sight Gage
Refer to R66 Illustrated Parts Catalog (IPC) Figure 79-5.
A. Removal
1. Drain engine oil per Section 12-60.
2. Refer to Figure 79-3. Remove B563-2 sight gage and o-ring from G689-1 oil tank
assembly. Discard o-ring.
3. Tape gage opening to protect tank from contaminants.
B. Installation
1. Refer to Figure 79-3. Remove tape from G689-1 oil tank assembly gage opening and
verify tank interior is free of contaminants.
2. Lubricate new o-ring using approved turbine engine oil per R66 Pilot’s Operating
Handbook (POH) Section 8. Install o-ring on B563-2 sight gage, and install gage in
tank. Special torque gage per Section 20-33.
3. Service engine oil per Section 12-60.
79-30 Engine Oil Cooler
Refer to R66 Illustrated Parts Catalog (IPC) Figure 79-7.
A. Removal
1. Drain engine oil per Section 12-60.
2. Refer to Figure 79-3. Remove fasteners securing F649-1 oil cooler to F309-1 box
assembly.
3. Remove hardware securing line assembly clamps.
4. Support oil cooler without damaging oil cooler fins. Loosen F723-2 and F723-4 line
assembly B-nuts at engine, oil cooler, and G689-1 oil tank assembly fitting; disconnect
lines at oil cooler unions. Cap unions and plug lines.
B. Installation
1. Refer to Figure 79-3. Remove F649-1 oil cooler union caps. Torque check oil cooler
unions and engine (oil line) union or check valve (early R66s) per Section 20-33.
2. Remove plugs and connect F723-2 and F723-4 line assembly B-nuts to oil cooler fittings.
Special torque B-nuts at tank, oil cooler, and engine per Section 20-33 and torque stripe
fittings.
3. Install hardware securing line assembly clamps.
4. Install hardware securing F649-1 oil cooler to F309-1 box assembly.
5. Service engine oil per Section 12-60.
SEP 2012 R66 Maintenance Manual Chapter 79 Engine Oil System Page 79.7
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