Boss BA440 PISTON Product Manual page 19

Next, press the bearing races out of the bearing
housing. Only push the tapered roller bearings off the
crankshaft if they're being replaced. If you're
replacing the crankshaft, discard the whole assembly.
Now press new bearings into the piston and
generously oil the front bearing race and install the
front bearing housing with gasket. Torque the bolts
to 180 in-lbs as shown below.
Slide the crankshaft into the crankcase and generously
lubricate the bearing race and install rear bearing
housing and gaskets.
Maintenance
Next install the oil pump and then the connecting
rods. Thoroughly oil the crankshaft rods before
installing them. When installing the rods, make
certain that the tabs are aligned on the same side of
the rod as shown below. Finally, install the pistons,
rings, and heads (See Piston Ring Replacement on
pg. 16)
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