Buick LeSabre 1965 Service Manual page 33

ENGINE
ENGINE DESCRIPTION 2 - 1 1
SECTION 2-B
ENGINE DESCRIPTION
Paragraph Subject
CONTENTS OF SECTION 2-B
Page Paragraph
Subject Page
2-4 Engines and Mountings 2-11
2-5 Engine Construction 2-11
2-6 Engine Lubrication System 2-15
2-7 Engine Cooling System 2-17
2-4 ENGINES AND MOUNTINGS
a. Engines in Each Series
Series
45000
46000
48000
49000
Engine
Code#
Prefix
LL
LP
LM
LT
LV
LX
LW
LX
Cu. In.
Displacement
300
300
300
401
401
425
401
425
Use
Standard
Optional
Export
Standard
Export
Optional
Standard
Optional
Compression
Ratio
9.0 - 1
10.25 - 1
7.6 - 1
10.25 - 1
8.75 - 1
10.25 - 1
10.25 - 1
10.25 - 1
Bore
3.750
3.750
3.750
4.1875
4.1875
4.3125
4.1875
4.3125
Stroke
3.400
3.400
3.400
3.640
3.640
3.640
3.640
3.640
Carburetor
2 Bbl.
4 Bbl.
4 Bbl.
4 Bbl.
4 Bbl.
2-4 Bbls.
4 Bbl.
2-4 Bbls.
Horsepower
Taxable Brake
45.0 210
45.0 250
56.11 325
315
59.51 360
56.11 325
59.51 360
b. Engine and Transmission
Mountings
The engine and transmission as-
semblies are supported in the
frame on three synthetic rubber
pads. One mounting pad is located
on each side of the engine near
the front end and approximately
midway between top and bottom
of the cylinder crankcase. The
mounting pads are fastened be-
tween the crankcase and the cross
member at front end of car
frame. The front mountings are
designed to support the weight of
the engine and control its tor-
sional characteristics.
The rear (transmission) mounting
is located between the transmis-
sion rear bearing retainer and
the transmission support.
2-5 ENGINE
CONSTRUCTION
(ALL ENGINES)
a. Cylinder Crankcase
The cylinder crankcase has two
banks of four cylinders each,
which form a 90 degree angle.
The crankcase section extends
below the centerline of the crank-
shaft to form a continuous flat
surface with the rear bearing cap
and the timing chain cover, per-
mitting installation of the lower
c r a n k c a s e with a one-piece
gasket. The upper portion of the
flywheel housing is cast integral
with the cylinder crankcase.
The right bank of cylinders (as
viewed from rear) is set slightly
forward of the left bank so that
connecting rods of opposite pairs
of cylinders can be connected to
the same crankpin. Starting at
front end, cylinders in the right
bank are numbered 1-3-5-7 and
cylinders in the left bank are
numbered 2-4-6-8.
b. Crankshaft and Bearings
The crankshaft is supported in the
crankcase by five steel-backed
full precision type b e a r i n g s ,
all h a v i n g the same nominal
diameter.
All bearings are identical except
number three, which takes end
thrust and rear main, which has
a different width and material.
See Figure 2-5.