SECTION 5
LYCOMING OPERATOR’S MANUAL
MAINTENANCE PROCEDURES
TIO-540 SERIES – ANGLE VALVE CYLINDER HEADS
(4) Using a piston ring compressor, assemble the cylinder over the piston so that the intake port is at
the bottom of the engine. Push the cylinder all of the way on, catching the ring compressor as it is
pushed off.
NOTE
Before installing cylinder hold-down nuts, lubricate crankcase thru-stud threads with any
one of the following lubricants, or combination of lubricants.
1. 90% SAE 50W engine oil and 10% STP.
2. Parker Thread Lube.
3. 60% SAE 30 engine oil and 40% Parker Thread Lube.
(5) Assemble hold-down plates (where applicable) and cylinder base hold-down nuts and tighten as
directed in the following steps.
NOTE
At any time a cylinder is replaced, it is necessary to retroque the thru-studs on the cylinder
on the opposite side of the engine.
(a)
Engine Using Hold-Down Plates –
Install shims between cylinder base hold-down plates and
cylinder barrel, as directed in Figure 5-5, and tighten ½ inch hold-down nuts to 300 in.-lbs.
(25 ft.-lbs.) torque, using the sequence shown in Figure 5-5.
(b) Remove shims, and using the same sequence, tighten the ½ inch cylinder base nuts, to 600 in.-
lbs. (50 ft.-lbs.) torque.
NOTE
Cylinder assemblies not using hold-down plate are tightened in the same manner as above
omitting the shims.
(c) Tighten the
inch hold-down nuts to 300 in.-lbs. (25 ft.-lbs.) torque. Sequence of tightening
is optional.
(d) As a final check, hold the torque wrench on each nut for about five seconds. If the nut does
not turn, it may be presumed to be tightened to correct torque.
CAUTION
AFTER ALL CYLINDER BASE NUTS HAVE BEEN TIGHTENED, REMOVE ANY NICKS IN
THE CYLINDER FINS BY FILING OR BURRING.
(6) Install new shroud tube oil seals on both ends of shroud tube. Install shroud tube and lock in place
as required for type of cylinder.
(7) Assemble each push rod in its respective shroud tube, and assemble each rocker in its respective
position by placing rocker between bosses and sliding valve rocker shaft in place to retain rocker.
Before installing exhaust valve rocker, place rotator cap over end of exhaust valve stem.
5-10
Содержание TIO-540-A1A
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