IO-390-D Series Engine Maintenance Manual
72-50
© 2020 Avco Corporation. All Rights Reserved
Page 238
March 2020
IO-390-D Series Engine Maintenance Manual
F.
Align the oil sump flange with the bottom of the mated crankcase halves as shown in Figure
17.
Figure 17
Oil Sump Aligned with Crankcase
CAUTION
ALL OF THE OIL SUMP FASTENERS (STUDS, BOLTS, AND NUTS)
MUST BE INTACT TO ENSURE CORRECT AND SECURE
TIGHTENING TO PREVENT OIL LEAKAGE AT THE OIL SUMP
MATING FLANGE WITH THE CRANKCASE. NO OIL IS TO LEAK
OUT OF THE OIL SUMP.
G.
Examine all of the oil sump fasteners identified as A, B, and C in Figure 13, that were to be
kept separate when the oil sump was removed. Make sure the bolts, studs, and nuts are not
damaged are intact and have no stripped threads. Replace any damaged or stripped fastener.
H.
Install the two “C” bolts each with a nut, two washers, and a new lock washer, at the location
shown in Figure 13, finger-tight.
I.
Install the 10 “B” bolts, each with a nut, two washers and new lock washer finger-tight.
J.
Install the eight “A” bolts each with a washer and new lock washer finger-tight.
K.
Torque all of the bolts on the oil sump to 96 in.-lb. (11 Nm).
CAUTION
TO PREVENT OIL LEAKAGE, MAKE SURE THAT THE OIL DRAIN
PLUG IS INSTALLED TIGHTLY IN THE OIL SUMP. SAFETY THE OIL
DRAIN PLUG.
L.
Install the oil drain plug in the threaded hole of the oil sump. Torque the oil drain plug per the
torque value in the latest revision of the
Service Table of Limits - SSP-1776
.
M.
Safety wire/cable the oil drain plug in accordance with the best standard practices per the
latest revision of AC43.13-B or the latest revision of Service Instruction No. SI-1566.
N.
Install the intake pipes per Chapter 72-80
O.
After maintenance is completed, add the correct oil to the engine per instructions in Chapter
12-10.
