Lycoming TEO-540-C1A Maintenance Manual page 201

TEO-540-C1A Engine Maintenance Manual
TEO-540-C1A Engine Maintenance Manual
NOTICE: Anytime either the connecting rod bolt and/or nut pairs are removed from a
Lycoming engine, replace both the bolt and nut pairs with new "Service Use
Only" hardware regardless of apparent condition.
(3) Refer to the latest revision of Service Instruction No. SI-1458 or the TEO-540-C1A
Illustrated Parts Catalog to identify the correct P/Ns for the new connecting rods bolts
and nuts.
(4) Make sure the new connecting rod bolt and new nut pairs are clean, free of dirt and debris
and that the threads are not damaged.
(5) Install the new lubricated matched set bearing pair on each connecting rod, one bearing
on the connecting rod and the other bearing on the connecting rod cap. Ensure that the
tang of each bearing fits and seats within the slot of the connecting rod as well as the
connecting rod cap.
NOTICE: Do not install standard size connecting rod bolts in connecting rods with
oversize bolt holes.
(6) Apply Loctite
threads of the new connecting rod bolts (Figure 60). Wipe away excess lubricant with a
clean, lint-free cloth.
(7) Apply engine oil mixture to the crank pin journals.
(8) Install each connecting rod end cap (with the bearings installed) on their respective crank
pins on the crankshaft (where the numbers on the connecting rods and bearing locks point
down - toward the oil sump.)
CAUTION
(9) Install a new nut on each new connecting rod bolt where the flat face of the nut touches
the connecting rod as shown in Figure 61.
(10) Torque the connecting rod bolts per the torque values in the latest revision of Service
Instruction No. SI-1458. (Stretch bolts require an initial torque and are then torqued to
the correct stretched length.)
(11) Measure the side clearance between the connecting rod and crankshaft with a feeler gage
where shown in Figure 62. The clearance is to be 0.004 to 0.016 in (0.102 to 0.406 mm).
© 2018 Avco Corporation. All Rights Reserved
November 2018
®
Food-Grade Anti-Seize Lubricant or equivalent to the bottom two or three
CORRECT INSTALLATION OF THE NEW NUT ON EACH NEW
CONNECTING ROD BOLT IS NECESSARY FOR CORRECT
CONNECTING ROD ASSEMBLY. EACH CONNECTING ROD NUT
HAS TWO DIFFERENT SURFACES, ONE SURFACE IS FLAT AND
THE OTHER HAS A RAISED LIP. BE SURE TO INSTALL EACH
NUT ON THE CONNECTING ROD BOLT WITH THE FLAT FACE
TOUCHING THE ROD. THE RAISED LIP SURFACE IS AWAY
FROM THE ROD. THE CONNECTING ROD BOLT CANNOT BE
TIGHTENED CORRECTLY IF THE NUT ON THE CONNECTING
ROD IS INSTALLED INCORRECTLY.
72-20
Page 171