Lycoming TEO-540-C1A Maintenance Manual page 216

(12) Attach the plates with washers and nuts on the thru-studs. Tighten the nuts only finger
tight at this time.
(13) Make sure that the plates remain parallel with the cylinder decks of the crankcase.
NOTICE: Before tightening the thru-studs, make sure that they extend equally on both
sides of the crankcase.
CAUTION
(14) Install a nut (and spacer as required) on each thru-stud at the mating flanges on the
crankcase halves in the sequence shown in Figure 96 to attach the crankcase halves
securely.
NOTICE: To ensure uniform loading on the main bearings, immediately torque the nuts on
the thru-studs in sequence (Figure 96), beginning at the center of the crankcase
and then progressing alternately to the rear and front of the engine.
(15) Tighten the nuts on thru-studs at the:
(a) Rear of Cylinder 4 (tighten both sides at the same time).
(b) Rear of Cylinder 6 (tighten both sides at the same time).
(c) Rear of Cylinder 2 (tighten both sides at the same time).
(d) Front of Cylinder 1 (tighten both sides at the same time).
72-20
Page 186
TO ENSURE CORRECT ASSEMBLY OF THE CRANKCASE
HALVES, TO MINIMIZE THE POSSIBILITY OF THE SUBSEQUENT
LOOSENING OF CYLINDER BASE NUTS, AND TO ENSURE A
UNIFORM LOAD ON THE MAIN BEARINGS IN THE CRANKCASE,
FOLLOW THE STEPS IN THE TORQUE SEQUENCE IN THE ORDER
GIVEN IN FIGURE 96.
Figure 96
Crankcase Tightening Sequence
TEO-540-C1A Engine Maintenance Manual
TEO-540-C1A Engine Maintenance Manual
© 2018 Avco Corporation. All Rights Reserved
November 2018