CONNECTING RODS, PISTONS, RINGS & SLEEVES
Figure 9. - Bearing Crush
When the assembly is drawn up tight, the bearing is
compressed, assuring a positive contact between the
bearing back and bore as shown in Fig. 10.
Figure 10. - Bearing Crush after Bolts are Torqued
To obtain correct "crush" torque bolts alternately
and evenly to 1 55 N-m (11 5 Ibf-ft).
Main and Connecting Rod bearings are designed
with the "spread" (width across the open ends)
slightly larger than the diameter of the crankcase
bore or connecting rod bore into which they are
assembled as shown in Fig. 11. The width
approximatly 0.64 mm (0.025 in.) more than
when the bearing is installed. This condition is
originally designed into the bearing causing it to
spread outward at the parting line when "crush"
load is applied by torquing the bolts. Some
"snap" may be lost in normal use, but the
bearing need not be replaced because of a
nominal loss of this condition.
Figure 11. - Bearing Spread Illustration
Bearing spread causes the bearing to fit snugly
which requires a force to seat it.
PRINTED IN UNITED STATES OF AMERICA