Subject: 3.17 drive
From: rotaryeng
Date: 1/13/2013, 1:47 AM
To: AAAA-rotaryeng


Paul,

Is it feasible to use a solid case, instead of a split case using inside
snap rings to separate the rotating elements?

milo

In theory yes because the rear flange is bolted on.

But given what I little I know about overhauling
piston engines bearing shells halves are a bit over size so when you
torque the case bolts... the shells compressed slightly and  are
held securely in place.

All you piston engine guys out there chime in on this.

The other problem is the oil slinger near the front of the shaft
but there is a work around for that.

Paul Lamar


Journal bearings as used for main and rod bearings in recip engines are built
such that the pair has a few thousandths of crush. One or both halves will
stick up from the housing half they are installed in when just seated by hand.
The bearing surface at the joint area will be cut back a small amount so that
when the bearing cap is torqued to final specification, the shell is pushed
tight into the bore to prevent turning. This would flare the shell at the
joint thus the imperceptable amount cut back to enable the shell to be round
and not close up clearance at the joint.

Dale Davies



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