Oil Plug Installation (If Removed) - Lycoming IO-390-D Series Maintenance Manual

IO-390-D Series Engine Maintenance Manual
IO-390-D Series Engine Maintenance Manual

17. Oil Plug Installation (if removed)

Make sure the 1/8 NPT oil plugs are acceptable, not damaged or cracked. Replace any worn,
A.
damaged or cracked NPT plug.
Apply of coating of Loctite
B.
Install three of 1/8 NPT oil plugs in each crankcase half (Figure 61 A, B, and C).
C.
Torque each 1/8 NPT oil plug to 40 in.lb. (4.5 Nm).
D.
Figure A
18. Tappet Assembly Installation
NOTICE: Roller tappets (Figures 62 and 63) are installed in the crankcase halves on Lycoming
IO-390-D Series engine models.
Roller tappets are not field repairable and are not to be disassembled for parts re-use.
Roller tappets only can be replaced and are to be replaced during overhaul.
A. Plunger Assembly Installation
CAUTION
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March 2020
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564 or equivalent to all six of the 1/8 NPT oil plugs.
Figure 61 A, B and C
Oil Plug Installation Steps
Figure 62
Roller Tappet
DO NOT MIX PLUNGER OR LIFTER ASSEMBLIES WITH DIFFERENT
PART NUMBERS IN THE SAME ENGINE. THE DIFFERENT LEAK
DOWN RATES WILL CAUSE INCORRECT ENGINE OPERATION.
ALL PARTS OF EACH HYDRAULIC PLUNGER ASSEMBLY ARE
SELECTIVELY FITTED AND ARE NOT INTERCHANGEABLE.
MATING PARTS MUST BE KEPT TOGETHER. IF THERE IS ANY
DOUBT AS TO WHETHER THE PARTS HAVE BECOME MIXED,
INSTALL NEW PLUNGER ASSEMBLIES.
Figure B
Installed Roller Tappets
Figure C
Figure 63
72-20
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