Ford 1961 TRUCK 100 SERIES User Manual

Bl006-A
FIG _ l-Cleaning Plug Eledrode
If a minor tune-up is being per-
formed, install the spark plugs and
torque them to 15-20 ft-Ibs.
2. Take A Compression Reading
Of Each Cylinder. Remove the coil
high tension lead at the distributor
cap.
Set the throttle plates (prima ry
throttle plates on ly on the 4-barrel
carb ur etor) and choke plate in the
wide open position.
In stall a compression gauge in No.
1 cylinder.
Using a remote starter switch,
crank the engine several times and
record the highest reading recorded.
No te the number of compression
strokes required to obtain the highest
reading.
Repeat the test on
each cylinder,
cranking the engine
the same num-
ber of tVncs for each cylinder as was
required to obtain the highest read-
ing on the No. 1 cylinder.
A variation
of ± 20 pounds from
specified pressure (150 psi at crank-
ing speed) is satisfactory. However,
the compression of all cylinders
should be uniform
wi thin 10 pounds.
A reading
of more than the allow-
FIG. 2-Gapping Spark Plug
PART 1-1- GENERAL ENGINE SERVICE
able tolerance above norm al indi-
cates excessive deposits in
the cyl-
inder.
A reading
of more than the a ll ow -
able tolerance bel
ow normal indi-
cates leakage at the cylinder h
ead
gask.et, piston rings, or valve s.
A l ow even co mpression in two
adjacent cylinders indicates a cylin-
der head gasket leak. Thi s should be
checked before condem ning the rings
or valves.
To determine whether the rings or
the valves are at fault, squirt the
equivalent
of a tablespoon of heavy
oil into the combustion
chamber.
Crank the engine to distribute the oil
and repeat the compression tes
t. The
o il wi ll temporarily seal leakage past
the rings. If approximately the same
reading is obtained,
the rings are
sat isfactory, but the valves are leak-
ing.
If the compression has in creased
'10 pounds or more over the original
reading, there
is leakage past the
rin gs.
Dur ing a co mpre ssi on test, if the
pressure fails to climb steadily and
remains the same during the first two
successive strokes,
but climbs higher
on the sllcceeding strokes, or fails to
climb
during the entire test, it indi-
cates
a sticking valve.
After the compression test, install
the s
park plugs. Torque them to
15-20 ft-Ibs. Do not install the coil
hi gh tension lead at this time.
3. Check And Tighten Inlake
Manifold Bolts. Check a ll intake
manifold bolts for
the recommended
torque (23-28 ft-Ibs). Torque the
bolts as necessary
star ting at the cen-
ter bolts
and working outw ards.
4. Free the Exha ust Gas Co ntrol
Valve. Refer to Fig. 3 or 4. Check
the thermostatic spring
of the valve
to make sure it
is hooked on the
stop pin.
The spring stop is at the top
of the valve housing when the valve
is
proper ly installed.
Make sure the spring holds
the
valve closed. Actuate the counter-
weight by
hand to make sure it
moves freely through approximately
90° of rotation without binding.
Fr ee a stuck valve with FoMoCo
Exhaust Gas Control Valve Solvent
(COAA-19A501-A)
or a penetrating
oil
and graphite mixture.
5.
Check And Adjusl The De-
H,clion Of The Drive Belts. Check
the deflection of the dr ive belts using
tool 33-73F. Follow
the instructions
of the too l manufacturer. Adju st the
tension as fo ll ows:
FIG. 3-223 Six Exhaust Gas
(ontrol Valve
1-9
SINGLE OR DOUBLE FAN
BELTS AND ALL GENERATOR
AND WATER PUMP BELTS.
Loosen th e gen erator mounting bolts
and the ad ju sting bracket bolt. Move
the gen erator toward or away from
the engine until the proper deflection
is
obta ined between the water pump
pulley and the generator pulley.
Tighten the generator adjusting
br ac ket bolt and the mounting bolts.
SEPARATE FAN BELT. Loosen
the fan bracket mounting bolt. Slide
the bracket up or down to obtain the
recommended deflection between the
fan pu
ll ey a nd the cra nk shaft pulley.
Tighten the fan bracket mounting
bolts.
On tru cks equipped with an air
compressor, it may be ne cessary to
loosen
the air compressor belt ad-
justment in order to obtain proper fan
belt
adjus tment. When the fan belt
adjustme nt is comp lete, always ad-
just the air compressor belt.
AIR COMPRESSOR BELT .
Loo sen the air compressor mounting
bolts. Slide the compressor on it s
mounting bracket to obtain the rec-
ommended deflection between the
compressor pulley and the fan pul-
ley (cra
nk sh aft damper on a C-Series
FIG. 4-292 MD v-a Exhaust
Gas (onlrol Valve

Ford 1961 TRUCK 100 SERIES Specifications

General

Brand	Ford
Model	1961 TRUCK 100 SERIES
Category	Automobile
Language	English