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Section
3-
Engine Removal and Installation
15
plate. Install
the floor panel
screws.
Install
the
bolts
securing the
cross
member
support
to
the right and
le
ft
wheel
~ousing.
Install
the engine cover
base plate
screws.
Insta
ll
the
sheet
metal
cover
between
the
engine
cover
and dash
panel.
Install
the master
brake
cylinder
inspection plate.
Install
the
left
floor plate.
Connect
the
accelerator
rod
and
dimmer
switch.
Position the
rubber
mat
over
the
brake pedal
opening,
then install the
pedal
opening
plate
and
pad.
Fill
the
radiator.
R em
ove
the tape from the
carbure-
tor air
horn. Start the
e ngine and
check
for
coolant
and
oil
leaks.
Install
the air cleaner to
engine cover
bracket,
then
install the
air
clea
ner
and
tube. Install
the operator's
seat and
bracket.
4.
INTAKE AND
EXHAUST
MANIFOLDS
The following inspection
procedures
are
applicable to
new
and
used
manifolds.
a.
Cleaning
and Inspection.
Re
move
the
manifolds.
W
ash grease,
oil, a
nd
dirt
from
the outside
of
the manifold.
Clea
n the
inside of the
man
ifold
with
a
round, bristle brush
attached
to
a
flexible wire handle.
Dry
with compressed air.
Inspect
t
he
mating flanges
of the intake manifolds for
cracks,
nicks,
burrs,
or scratches.
Check
the
flatne
ss
of
th
ese surfaces as
indicated in
fig.
8.
Check the fuel-air
passages
and
t he heat
riser for restrictions. Check the
manifold openings
for proper
alignme nt with
their
respective cylinder head
ports.
Improper
a lignment
may
result in
a loss o
f
power.
Inspect
the
entire
manifold
for
cracks
or visible
casting
defects which
wou
ld
make
it
unfit for further
service.
Inspect
the exhaust manifold for burned out
spots,
cracks,
and /or weak
sections.
h. Repairs.
Dress
nicked or
warped
mating
surfaces on a surface
plate. M
inor
nicks,
burrs, or scratches
may
be
removed
with
a
file.
R emove
all
obstructions from
intake
manifold
pas-
sages.
R
eplace
cracked
or severely warped
manifolds,
and
those
manifolds
which
contain
unremovable
obstructions.
Replace defective
ex ha ust
manifolds.
CAUTION
:
R
e
mo
ve
all
filings anel
for eign matter
that may
have e
ntered
t.he
m_
anijold
a$ a
re$ult
of
re
pair
work.
6261
Fig. 8-Checking
Flafness
01 fhe
Infake Manilold
Mounting Flanges
5. ROCKER MECHANISM, CYLINDER HEAD, VALVES,
VALVE
LASH
ADJUSTMENT,
AND
VALVE TIMING
This section
covers the
inspection
and
repair
proced-
ures applicable
to
the
rocker
mechanism,
cylinder
head,
and
valves.
In
addition,
the methods
used
to
check valve
timin
g are
given.
a. Rocker
Mechanism.
(
1)
CLEANING AND
INS PECTION.
R
emove
and
disassemble
the rocker mechanism.
Check
the
I
.
D
. of
the
rocker
arm
bore
and
the
O.
D
. of the
rocker
arm
shaft,
at the
location
of
the rocker
arms,
against
specifi-
cations.
M
ake sure
th
ese surfaces are free of scuffs,
scores, nicks,
or scratches.
Inspect the
rocker arms
for
grooved
pads.
Check
the
rocker
a
djusting
screws
and
lock nuts
for
stripped
or
broken threads,
and the
ban
end
of t he screw
for nicks
and scratches. Make sure
the
adjusting
screws
turn
freely
in
the
rocker
arms.
Inspect
the
locating springs
for
cracks or
other
signs
of
failure.
Inspect the
oil
drain
tube fo
r
cracks or sharp
bends.
Check the push
rods
between ball and
cup ce nters
with
a
dial indicator for
conformance
to
specifications
(fig.
9).
Check the
ban
end and socket end of the
push
rods
for
nicks,
grooves,
or
roughness.
NOTE:
A
roug
h ch
ec
k for bent push roels can be
made while
they are
in.talled in
the e
n gine by rotat-
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