Continental L-Head Overhaul Manual - Igor Chudov

Figure 145 -- Checking Bearing Clearance with
Feeler Stock
An alternative method is to use a piece of
feeler stock (the thickness of which should be
equivalent to ~:he maximum clearance permissible
in the bearing) lengthwise, in the bearing shell, on
a film of oil. Assemble the bearing cap and tighten
the screws, torquing them to the specifications, -then
try to turn the crankshaft by hand to determine
whetller or not you can feel a drag.
If a definite drag is felt and the piece of feeler
stock is equivalent to, but no more in thickness
than the maximum clearance specified, you may be
sure that neither the crankshaft nor bearing are
worn excessively as far as clearance is concerned.
When using new bearings and the crankshaft is
not worn, checking with a piece of feeler stock as
outlined above should lock up the crankshaft, making
it possible to turn only by use of a bar or
wrench.
If crankshaft is scored, or worn enough so that
new bearings will not fit with the required clearance,
it should be removed and reground.
Standard crankshafts may be reground to decrease
the diameter a maximum of .040.
Before shaft is reground, it must be checked for
straightness and straightened if necessary to be
within .002 indicator reading. When reground, the
fillet radii must be within dimensional limits and
must be perfectly blended into thrust and bearing
surfaces.
8. Connecting rod bearings and crank pins may
be checked in the same manner with one exception ;
instead of trying to turn the crankshaft when the
connecting rod bearing is tightened on it with a
piece of feeler gauge assembled, try to move the
connecting rod from side to side.
CONTINENTAL L-HEAD ENGINE MANUAL Page 63
AVOID
tS]~E ~ SHARP ~ INSUFFICIENT
CHART ~ERS
B E L 0..
RIGHT WRONG WRONG
Figure 146 -- Crankshaft Fillet Radii
N ~:/;._," R on all crankpins and mains
%~" R on all crankpins and front & center
Y mains
~2" R on rear main
FM
’~:~’, + ~4 R on all crankpins
except rear
Vs"
and mains
+- ~//~4’’ R on rear main
~- a/ ,, _ ,~ ,, R on all
’,32 ~- /64
crankpins and mains
Figure 147--Replacing Bearing
Figure 148 ~ Checking Rod Bearing with Feeler Stock
With new bearing shells and fee~er stock equivale~t
to the specified clearance in thickness, if the
crank pin is not worn you will quite probably have
to use a hammer tap to move ~he rod from side to
side, indicating that the clearance is well within
the specification range.