Connecting Rod Removal - Lycoming YO-233-B2A Maintenance Manual

YO-233-B2A Engine Maintenance Manual
TEO-540-A1A Engine Maintenance Manual
CAUTION
NOTICE: During piston removal, support the connecting rod to prevent damage to the
connecting rods and crankcase:
B. Remove the piston from the connecting rod.
C. Install Torque Hold-Down Plates (ST-222) (Figure 19) or equivalent as shown in Figure
20.
Figure 19
Torque Hold-Down Plate (ST-222)
CAUTION
D. Start from the top down, use the Piston Ring Expander (P/N 64713) to remove the two
top compression rings and the oil regulating piston expander ring (Figure 18).

9. Connecting Rod Removal

CAUTION: DO NOT RE-USE THE CONNECTING ROD BEARINGS, BOLTS, AND
NUTS.
NOTICE: If the two nuts in the connecting rod cap cannot easily be removed, use a soft (plastic
head) mallet and gently tap on the end of the two bolts to remove the nuts and the bolts.
A. Remove and discard the two nuts
(Figure 21) and the two bolts
that attach the connecting rod
cap to the connecting rod.
B. Remove the connecting rod cap
and connecting rod; keep them
together, apply a label to identify
the throw position of the
connecting rod for reference on
assembly.
C. Remove and discard the two
connecting rod bearings.
© 2021 Avco Corporation. All Rights Reserved
February 2021
ANYTIME A CYLINDER IS REMOVED, INSTALL TORQUE HOLD-
DOWN PLATES OR EQUIVALENT TO ENSURE A UNIFORM LOAD
ON THE MAIN BEARINGS IN THE CRANKCASE.
DURING REMOVAL OF THE THREE PISTON RINGS IN THE NEXT
STEP, USE CARE NOT TO SCRATCH THE PISTON.
Figure 20
Installed Torque Hold-Down Plates
Figure 21
Connecting Rod Parts
72-30
Page 113