Buick LeSabre 1965 Service Manual page 53

ENGINE
HEADS AND VALVES 2 - 3 1
•WASHER
^NOTCH
•^COTTER
I
9.
Figure 2-24—Rocker Arm Shaft End
View
shaft, and a bracket is located be-
tween each pair of rocker arms.
4. Install s p r i n g washer, flat
washer, and cotter pin on each
end of shaft in the order named.
5. Install bolts with plain washers
through brackets and shaft so that
the notch on one end of shaft is
upward in line with bolt heads.
This places the oil holes on lower
side of shaft in proper relation-
ship to rocker arms. See Fig-
ure 2-24.
I
REAR OF LEFT ROCKER ARM S H A F T m
d. 300 cu. in. Engine
Install bolts with plain washers
through the brackets and shaft so
the notch in the right assembly is
up and to the front and the notch
in the left assembly is up and to
the rear. See Figure 2-25.
e. Installation of
Cylinder Head
(401 & 425 cu. in. Engine)
Make certain that gasket surfaces
and all parts are absolutely clean,
then install cylinder h e a d by
reversing the procedure for re-
moval, paying particular attention
to the following points.
(1) When handling thin crimped
steel gaskets use care to prevent
damage to the lacquered surface
coat and to prevent kinking at
sealing rings stamped in gasket.
The lacquered gasket should not
be coated with any type of sealing
material when installed. Always
use a new steel gasket because
the stamped sealing rings are
flattened in a used gasket.
(2) Right and left cylinder heads
are identical except that the water
inlet port is open at front end and
is plugged at rear end as installed
on engine.
(3) After installation of cylinder
head, tighten all bolts a little at
a time about three times around
in sequence shown in Figure 2-26,
then finally tighten in same se-
quence to 65-75 ft. lbs. torque.
Figure 2-25—Rocker Arm Shaft
Installation
Figure 2-26—Cylinder Head Bolt
Tightening Sequence
Always use an accurate torque
wrench when tightening cylinder
head bolts, to insure uniform and
proper torque on all bolts. Uneven
or excessively tightened b o l t s
may distort c y l i n d e r bores,
causing compression loss and ex-
cessive oil consumption.
(4) Install locking plates with
exhaust manifold bolts, tighten
bolts only to 10-15 ft. lbs. torque,
then bend one tab of plate against
a flat on each bolt head.
(5) When rocker arm and shaft
assembly is installed, make cer-
tain that the notch in one end of
shaft is upward in l i n e with
bracket bolt heads. See Fig-
ure 2-24.
(6) Install intake manifold gaskets
so pointed end of each gasket is
"IN" toward center of engine.
(7) After installation is completed
and engine has been warmed up to
operating temperature, recheck
cylinder head bolts for 65-75 ft.
lbs. torque.
f. Installation of Cylinder
Head (300 cu. in. Engine)
1. Wipe off engine block gasket
surface and be certain no foreign
material has fallen in the cylinder
bores, bolt holes, or in the valve
lifter area. It is good practice
to clean out bolt holes with an
air hose.
2. Install new head gasket on cyl-
inder block. Dowels in the block
will hold the gasket in position.
Always handle gaskets carefully
to avoid kinking or damage to
the surface treatment of t h e
gasket. Do not use any type of
sealing material on head gaskets.
The gaskets are coated with a
special lacquer to provide a good
seal, once the parts have warmed
up.