Oil Pump Removal; Oil Pump Installation - Lycoming TEO-540-C1A Maintenance Manual

2. Oil Pump Removal

A. Remove the safety wire (Figure 3) from the slotted nuts that attach the oil pump body
assembly to the accessory housing.
Figure 3
Safety Wire on the Oil Pump
B. Remove the three slotted nuts and three washers that attach the oil pump body assembly to
the studs in the accessory housing.
C. Remove the oil pump drive gear assembly from the oil pump body assembly (Figure 4).
D. Remove the oil pump body from the accessory housing.
E. Remove the impellers from the oil pump body assembly.

3. Oil Pump Installation

A. Lubricate all parts of the oil pump with a mixture of 15% pre-lubricant and 85% SAE No. 50
mineral base aviation grade lubricating oil.
B. Install the impellers in their respective compartments in the oil pump body assembly (Figure 4).
C. Install the oil pump body assembly over the mounting studs on the accessory housing.
D. Install the oil pump drive gear assembly into the oil pump body assembly and through impeller
(Figure 4).
E. Install a washer and slotted nut on each of the three studs on the accessory housing.
F. Tighten the three slotted nuts gradually and evenly, turning the drive gear shaft while
tightening to ensure free movement of the impellers.
NOTICE: If the oil pump drive gear assembly binds while tightening the slotted nuts, remove
the oil pump, examine all parts of the oil pump for wear or damage. Replace worn or
damaged parts as necessary and re-install the oil pump.
G. Torque the slotted nuts to 17 ft.-lb. (23 Nm).
H. Safety wire the three slotted nuts as shown in Figure 3.
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TEO-540-C1A Engine Maintenance Manual
TEO-540-C1A Engine Maintenance Manual
Oil Pump and Internal Side of the Accessory Housing
© 2018 Avco Corporation. All Rights Reserved
Figure 4
November 2018