79-20 Oil Tank Assembly (continued)
B. Installation
1. Refer to Figure 79-3. Remove caps from G689-1 oil tank assembly fittings.
2. Torque check union at oil cooler, and torque check engine (oil line) unions and check
valve per Section 20-33.
3. Insert tank through main rotor gearbox compartment access door. Install hardware
securing tank tabs to F384-3 angles.
4. Install nuts securing tank fittings to firewall and special torque nuts per Section 20-33.
5. Remove plugs and connect F723-1, F723-3, and F723-4 line assembly B-nuts to tank
fittings. Special torque B-nuts at tank, F649-1 oil cooler, and engine per Section 20-33
and torque stripe fittings.
6. Install hardware securing line assembly clamps.
7. Connect harness assembly plug to oil temperature sender (located on inboard side of
tank).
8. Fit tube onto tank scupper drain. Wrap tube with two turns 0.032-inch diameter lockwire
and safety tube to drain.
9. Service engine oil per Section 12-60.
10. Install tailcone cowling assembly per Section 53-23.
79-21 Oil Temperature Sender
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.
3. Refer to Figure 79-3. Disconnect harness assembly plug from MS28034-1 oil
temperature sender (located on inboard side of G689-1 oil tank assembly).
4. Remove sender and gasket from tank, and discard gasket.
5. Tape sender opening to protect tank from contaminants.
B. Installation
1. Refer to Figure 79-3. Remove tape from G689-1 oil tank assembly sender opening
and verify tank interior is free of contaminants.
2. Install new gasket on MS28034-1 oil temperature sender, and install sender in
inboard side of tank. Special torque sender per Section 20-33.
3. Connect harness assembly plug to sender.
4. Service engine oil per Section 12-60.
5. Install tailcone cowling assembly per Section 53-23.
Page 79.6 Chapter 79 Engine Oil System R66 Maintenance Manual SEP 2012
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