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B. Install fittings (Figure 7) in the accessory housing.
C. Torque the fittings per the latest revision of the Service Table of Limits - SSP-1776.
D. Install plugs in the accessory housing (Figure 8) with a new O-ring as required.
E. Torque the plugs per the latest revision of the Service Table of Limits - SSP-1776.
F. Turn the crankshaft to position cylinder 1 at TDC.
G. Apply a light coat of Gasket Sealant #4 to the locations shown in Figure 9.
H. Install a new accessory housing gasket (Figure 2) over the locating dowels on the rear of the
crankcase.
I. Apply a liberal coating of engine oil all contact surfaces, such as gear teeth and the idler gear
hub.
NOTICE: When installing the accessory housing, if necessary, turn the crankshaft to enable
the tangs on the oil pump drive shaft (Figure 4) to correctly align with the slots in
the crankshaft gear (Figure 5).
J. Fit the accessory housing into place on the rear of the crankcase.
K. Install all Bolts A, B, and C with plain washers and new lock washers in the correct locations
shown in Figure 1. Torque the bolts to 96 in.-lb. (11 Nm).
L. On engines with a rear-mounted propeller governor drive, install the propeller gear drive
adapter assembly per the "Propeller Governor Drive Installation" procedure in Chapter 72-
60.
M. Connect the hoses to the airframe-supplied oil cooler.
72-25
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IO-390-D Series Engine Maintenance Manual
IO-390-D Series Engine Maintenance Manual
Figure 9
Gasket Sealant Locations
© 2020 Avco Corporation. All Rights Reserved
March 2020
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