Major Tune-Up - Ford 1956 Truck Shop Manual

Section 2-Tune-Up
9
During a compression test, if the pressure fails to
climb steadily and remains the same during the first two
successive strokes, but climbs higher on the succeeding
strokes, or fails to climb during the entire test, it indi-
cates a sticky, or stuck valve.
(3) CLEAN, ADJUST, AND INSTALL SPARK
PLUGS. Sandblast the spark plugs,
wipe the porcelain
clean, file the electrode tips flat, and adjust the spark
gap. Test the plugs in an approved spark plug tester.
Inspect the plugs for broken or chipped porcelain and
badly burned electrodes. Replace all defective plugs. In-
stall the spark plugs and tighten them to the specified
torque.
(4) CHECK THE DISTRIBUTOR. Remove the
distributor cap and rotor. Inspect the breaker points for
pitting and burning. Replace defective points. Clean and
install the distributor cap and rotor.
(5) CHECK IGNITION TIMING. Disconnect the
distributor vacuum line. Operate the engine at idle
speed. Check the timing with a timing light and make
the necessary adjustments. Connect the distributor
vacuum line.
(6) CHECK MANIFOLD VACUUM AND ADJUST
CARBURETOR IDLE. Check the manifold vacuum at
the specified idle speed.
If the vacuwn is lower than specified, check for leak-
age at the vacuum lines and intake manifold. Check the
carburetor idle adjustment.
If the vacuum is still below normal or is erratic, it is
an indication of bad rings, sticky valves, weak valve
springs, or a head gasket leak.
Set the engine idle speed and the carburetor idle fuel
adjustment as outlined in Chapter IV.
(7) CHECK GOVERNOR OPERATION-B-CYLIN-
DER ENGINES. Connect a tachometer to the engine.
Start the engine and gradually increase the throttle
opening, observing the tachometer reading, until the no-
load cut-off speed is reached.
If
the cut-off is not within
the specified range, stop the engine and make the neces-
sary adjustments. Repeat the test until the correct cut-
off speed is obtained.
(8) CLEAN THE AIR CLEANER AND THE FUEL
FILTER. Clean the air cleaner, and oil the element. If
the air cleaner is the oil bath-type, fill to the indicated
level with engine oil of the specified viscosity.
Remove and clean the fuel pwnp bowl. Install a new
filter element.
In addition, on the ECR 272, 302 and 332 cubic inch
engines clean the fuel line filter container and replace
the filter element.
(9)
CHECK THE DEFLECTION OF THE DRIVE
BELTS. Check the deflection of all drive belts (fan,
generator, air compressor, and power steering). Make
the necessary adjustments.
h. Major Tune-Up.
Perform the following operations in the order given.
(1) BATTERY. Remove the cables from the battery.
Clean the battery terminals and cable connectors. In-
spect the battery case for cracks and leaks. Make a bat-
tery capacity test. If unsatisfactory, make a battery
charge test. If the charge is low, recharge the battery.
Replace deteriorated connectors and cables that have
worn insulation. Brush the cable connectors with grease
to retard further corrosion. Connect the cables to the
battery.
(2) CHECK THE GENERATOR AND REGULA-
TOR. Follow the procedures outlined in Part Three,
"Electrical and Accessories."
(3) TEST SPARK INTENSITY. Determine if the
spark from each spark plug wire will jump a o/t6-inch
gap, as follows:
Remove one spark plug wire, and install a terminal
adapter in the wire terminal. Hold the end of the adapter
approximately %6 inch from the cylinder head. Run the
engine at idle speed. The spark should jump the gap
regularly. Repeat the test on each lead.
If the spark is unsatisfactory at all spark plugs, trouble
exists in the coil, condenser, rotor or cap, internally in
the distributor, or in the external primary circuit.
If the spark is unsatisfactory at some, but not all of
the spark plug wires, the trouble is in the wire itself, the
wire is not seated in the housing socket, or the distribu-
tor cap is corroded.
(4) TEST CYLINDER COMPRESSION. Follow the
procedure under Ita. Minor Tune-Up."
(5) CLEAN, ADJUST, AND INSTALL THE SPARK
PLiJGS. Sandblast the spark plugs, wipe the porcelain
clean, file the electrode tips flat, and adjust the gap. Test
the plugs in an approved tester. Inspect the plugs for
broken or chipped porcelain and badly burned elec-
trodes. Replace all defective plugs. Install the plugs and
tighten them to the specified torque.
(6) CHECK MANIFOLD BOLT TORQUE. Tighten
the intake and exhaust manifold bolts and nuts to 23-38
foot-pounds torque.
(7) TEST COIL AND CONDENSER.
If the spark
intensity (3) is satisfactory, it will not be necessary to
test the coil and condenser. However, if the spark is not
satisfactory, test these parts on a test unit to determine
which one is defective. Follow the instructions of the
test unit manufacturer.
(8) INSPECT BREAKER POINTS AND TEST
THE DISTRIBUTOR. Inspect the distributor points
for pits, excessive metal transfer, and burned spots.
Test the vacuum advance and make adjustments, re-
pairs, or replacements as required. Set the point gap to
specifications. After setting the gap, check the point
dwell. If the dwell angle is not to specifications, the dis-