Hydraulic - Buick LeSabre 1965 Service Manual

2 - 3 2 HEADS AND VALVES
ENGINE
3. Assemble exhaust manifold to
cylinder head with bolts and lock-
ing plates as shown in Fig-
ure 2-27. Torque bolts to 10-15
ft. lbs.
NOTE: Automatic transmission
filler tube bracket fastens to rear
bolt, right side.
4. Clean gasket surface of cyl-
inder head and carefully set in
place on the engine block dowel
pins.
5. Clean and lubricate the head
bolts with "Perfect Seal" sealing
compound. Install bolts as shown
in Figure 2-28.
6. Tighten the head bolts a little
at a t i m e about three times
around in the sequence shown in
Figure 2-28, then torque the bolts
in the same sequence to 70-75
ft. lbs.
NOTE: Damage to the cylinder
block threads can result if bolts
are not lubricated with "Perfect
SeaP' p r i o r to installation, or
if the b o l t s are t i g h t e n e d
excessively.
Use an accurate torque wrench
when installing head bolts and
do not overtighten. Uneven tight-
ening of the cylinder head bolts
can distort the cylinder bores,
causing compression loss and ex-
cessive oil consumption.
Figure 2-28—Cylinder Head Bolt
Installation
Figure 2-27—Exhaust Manifold
Installation
2 - 1 4 HYDRAULIC
VALVE LIFTER
SERVICE
a. Removal of Valve Lifters
1. Remove air c l e a n e r and
silencer, then disconnect all pipes
from c a r b u r e t o r and intake
manifold.
2. Disconnect wires from the ac-
celerator vacuum switch and re-
move the throttle return spring.
Remove ignition coil and equal-
izer shaft bracket from intake
manifold and move these parts
out of the way.
3. Remove intake manifold and
carburetor as an assembly. Re-
move manifold gaskets.
4. With air hose and cloths, clean
dirt from cylinder heads, valve
lifter cover and adjacent area to
avoid getting dirt into engine. It
is extremely important to avoid
getting dirt into the hydraulic
valve lifters.
5. Remove rocker arm cover,
rocker arm and shaft assembly,
and push rods from bank where
valve lifters are to be removed.
6. Remove valve lifter cover and
remove the valve lifters that re-
quire service. Place lifters in a
wooden block having numbered
holes or used other s u i t a b l e
method of identifying them ac-
cording to original position in
engine.
If less than a full set of lifters is
being removed, immediately dis-
assemble and inspect one or two
for presence of dirt or varnish
(subpar. c). If lifters contain dirt
or varnish it is advisable to re-
move all lifters for cleaning and
inspection; otherwise it will be
satisfactory to service only those
lifters that are not operating
properly.
J. Examine the cam contact sur-
face at lower end of each lifter
body. If this surface is exces-
sively worn, galled, or otherwise
damaged discard the lifter as-
sembly. In this case also examine
the mating camshaft lobe for ex-
cessive wear or damage.
b. Cleaning Tank J- 5093 and
Cleaning Fluids
Cleaning Tank J-5093 is designed
to permit a s y s t e m a t i c and
thorough c l e a n i n g of hydraulic
valve lifter parts. It provides
three compartments for cleaning
fluids, two 1 6 - c o m p a r t m e n t
cleaning trays, one small tray for
special tools and a removable
cover. The two cleaning trays
allow one set of lifters to be
soaking while another set is being
worked on. The cover, placed on
bench in front of tank, provides
an easily cleaned working sur-
face. See Figure 2-29.
The left hand compartment of tank
is for cleaning solvent in which
parts are soaked after disassem-
bly. The solvent required should
either dissolve the varnish de-
posit on lifter parts or soften the
varnish so that it can be removed
by wiping, after soaking for not
longer than one hour. Gulf Motor
Flush, or an equivalent solvent,
will effectively clean lifter parts.
When selecting a cleaning sol-
vent, careful consideration should