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8-28
drill or pierce the plug on one end.
Use a steel rod to knock out the
plug on the opposite end. Working
from the open end, knock out the
remaining
plug.
CLEANING AND INSPECTION
Refer to page 8'-15
for the cleaning
and inspection procedures.
'REPAIRS
Refer to
page
8-39 for
the repair
procedures.
ASSEMBLY
1. Lubricate all parts with engine
oil.
Apply Lubriplate to the valve
and
push rod ends of the rocker
arm.
l.
If
the plugs were removed
from
the ends of the shaft, use a
blunt
tool
or large diameter pin
punch
and install a plug, cup side
out,
in
each end of the shaft.
3.
Install
the spring. washer and
pin
on one end of the shaft.
4. Install the valve rocker
arms,
supports, and springs in the order
shown in
(Fig. 12)
Be
sure the oH
holes in the shaft are fadnc dowa-
ward. Complete the assembly by ID-
stalllng the remaining spring washer
and pin.
CYLINDER HEAD
REMOVAL
1. Drain
the
cooling system. Re-
move
the
air cleaner.
l. Disconnect the muffler inlet
pipe
at
the
exhaust manifold. Pull the
muffler
inlet
pipe down
.
3. Disconnect the accelerator rod
retracting spring. Disconnect the
accelerator rod at the carburetor.
4. Disconnect the fuel inlet line at
the fuel
filter hose, and the distribu-
tor vacuum
line at the carburetor.
5. Remove
the
radiator upper hose
at the coolant
outlet housing.
6. Disconnect the distributor vac-
uum
line
at the distributor. Discon-
nect
the carburetor fuel inlet line
at
the fuel
pump. Remove the lines
as
an assembly.
7.
Disconnect
the
spark
plug
wires at the spark plugs and the
temperature sending unit wire at the
sending
unit.
8. Remove the emission control
system
vent
hose and valve assembly.
9. Remove the valve rocker arm
cover.
10. Remove the valve rocker arm
shaft
assembly. Remove the valve
push
rods
in sequence (Fig. 13).
11. Remove the remaining cyl-
inder
head
bolts and remov-e
.
the
cylinder head.
Do
not pry betweea
GROUP
8-
ENGINE
(
RETAINING SOL T
6A527
.~370347·5
•
&
Ill
·
/SUPPORT
lJ
·
. J).fl)•i
6531
ROCKER
ARM
•
/
6564
,.J!J)'-i
/SPRING
tlil ,
-
6587
~W
·
1 J;-~
sHAFT
l.l!
PulJJo.
ft
6563
PLUG
•
,
6572
. ,
/JI))ni/IJ
,
WASHER
~o;SPRING
,
1
6598
FRONT OF ENGINE
-....:_-
-
PIN
........._372929-S
FIG. 12- Valve Rocker Arm Shaft Assembly -Typical
the cylinder head
and
blOck as the
gasket surfaces may become dam-
qed.
Note: On 250-2V engines the inlet
and exhaust manifolds must be re-
moved before the
cylinder
head can
be removed.
INSTALLATION
Note: On 250-2V engines the
cyl-
inder
head is replaced first
followed
by the exhaust manifold then the
inlet
manifold. See page 8-27 for detail.
1. Clean the head and block gas-
ket .surfaces. If the cylinder head was
removed for a gasket change, check
the flatness of the cylinder head and
block. Install guide studs at each
end of the cylinder block (Fig. 14).
..
'
15
(i)·
0 0
.e
~
~
~ ~
<
.;~
"-
~~~~,t~~
..
l~~?lt.Tl .~r-1
~~
'
.,
•
/AI" f~
{ ""'
11 ~.
{
··
-·.
-
.
..
-a..
. . . .
•
.
•
,
FIG. 13- Valve Push Rod
Removal
2. Do not apply sealer to six
cylinder engine head gaskets.
Position the gasket over the guide
studs on the cylinder block.
3. Inspect the muffler
inlet
pipe
sealing ring and replace
if
necessary.
4.
Lift the cylinder head over the
guides and slide it down carefully,
guiding the exhaust manifold studs
into the muffler inlet pipe.
5. Coat the thread of No. 13 bolt
with a small amount of water-resist-
ant sealer. Install, but do not tighten
two bolts at opposite ends of the
head to hold the head and gasket in
position. Remove the guides and
install the remaining bolts.
Refer Fig.l5 for No. 13 bolt
.
6. The cylinder head bolts are
tightened in three progressive steps.
Torque all the bolts
in
sequence (Fig.
15)
to 55 ft-lbs, then to 65 ft-lbs,
and finally to specifications. After
the cylinder head bolts have been
torqued to specifications, the bolts
should not be disturbed.
7. Apply Lubriplate to both ends
of the push rods. Install the push
rods in their original bores, position-
ing the lower end of the rods into
the tappet sockets. Apply Lubriplate
to the valve stem tips and to the
rocker arm pads.
8. Install the valve rocker arm
shaft assembly following steps 1 to
4 under Valve Rocker Arm Shaft
Installation.
Check the valve clearance, fol-
lowing the procedure outlined under
Valve Clearance (Part 8-1, Section
2).
9. Install the muffler inlet pipe
lock washers and retaining nuts.
Torque the nuts to specifications.
10. Connect the radiator upper
hose at the coolant outlet housing.
11. Replace the valve rocker arm
cover and torque to specifications.
12. Replace the emission control
system vent hose and valve assembly.
7
/
16"-14x6" BOLT. CUT OFF HEAD, TAPER
END AND SLOT FOR SCREWDRIVER.
FIG. 14- Cylinder Head
Guide Studs
13. Position the distributor vac-
uum line and carburettor fuel inlet
line on the engine, then connect the
distributor vacuum line at the carbu-
rettor.
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