Hudson 1948 - 1952, Service Manual

Page: 58 / 333

NOTE: Crankshaft bearings are not adjustable as no
shims are used. NEVER FILE bearings or bearing caps to
reduce clearance.
1. If all new main bearings are to be Installed, it is advisable
to remove the engine from the chassis and place in a
suitable overhaul stand. See "Engine Removal", page 17.
2. Remove oil pan and trough.
3. Remove main bearing cap screws and remove bearing
caps.
NOTE: Front and rear bearing caps can be easily removed
with Bearing Cap Puller 3-2955, Figure 13.
CAUTION: DO NOT DAMAGE the front end plate
gasket when removing front bearing cap.
4. Thoroughly clean all traces of cotton packing from the
grooves in the case and cap, Figure 18, to avoid clogging
of the oil passages.
FIGURE 18
5. Remove crankshaft (See "Crankshaft Removal" , page 27.
6. Remove slotted screws retaining bearings in cylinder
block and remove bearings.
Installation:
Recommended total diametral clearance between crank-
shaft journals and main bearings is .001. This close clear-
ance must be maintained when fitting new bearings.
NOTE: Hudson main bearings are furnished in standard
or .010 undersize finished reamed, or unfinished (for
shops with line reaming equipment).
SIZE CODE
When replacing crankshafts, the undersize dimension is
located on the front face of No. 1 counterweight.
When replacing main bearings, the .010 undersize di-
mension is noted by a spot of green paint and the part
number stamped on the bronze back in indelible ink for
eight cylinder engines. On six cylinder engines the part
number and size are stamped on the steel back of the
bearing shells only. Refer to your 480 series parts book for
proper identification.
Engines built with undersize associate parts are identi-
fied by the following designated marks stamped on the
bottom face of the cylinder block at the left front corner in
a clear area beyond the oil pan gasket.
P.U. means crankshaft has .010 undersize crank pins.
M.U. means crankshaft has .010 undersize main bearing
journals.
P.M.U. means crankshaft has .010 undersize pins and main
bearing journals.
In cases where new unfinished bearings are being fitted,
the caps and bearing shell assemblies should be Installed in
the case and tightened to 70 to 75 foot pounds torque, then
line reamed to size.
Crankshaft should have .006 to .012 end play measured
at the center main bearing in each case. When Installing
new factory unreamed shells, it may be necessary to ma-
chine the thrust flange face of the center bearing shells in
order to obtain this amount of end play.
3 - 16 ENGINE