Ford F-750 Shop Manual

Section 8-0il Pan, Oil Filter, and Oil Pump and Pressure Relief Valve
27
With the engine at normal operat ing t empe r ature
and operating at fast idle, chec k for oil l ea ks past the
housing gasket or around t he center bolt gasket. If
oil leak "s past the hou sing gasket , check the housing
for pr oper seating. If oil leaks past the ce nter bolt
gas ket , chec k the center bolt f or proper to rque .
c. Oil Pump and Pressure Relief Valve
Remove and disassemble th e oil pump and pressure
relief valve. Wa sh all parts in a so lv ent and dry them
thoroughly. U se a brush to clean the insid e of the
pump housing and the pressure relief va lv e bore. Be
s ur e all dirt a nd c hip s are removed. Rem ove all old
gasket material from the pump body an d cover.
Che ck the pump housin g f or damage or excessive
wear. Check the pump gear te et h for damage or wear.
Check t he compression of the relief valve spring. Check
th e relief valve clearance in the relief valve bore.
Check the driven shaft cle ara nce.
Replace a ny worn or defective parts.
9. CYLINDER BLOCK, PISTONS, PISTON RINGS, AND CONNECTING RODS
Procedures for checking th e cylinder blo ck; for clean-
ing,
inspecting, and fitting pistons; for fitting piston rin gs;
and for checking connecting rod a li g nment are given
below.
a. Cylinder Block.
Make a thor ough check for cracks. Minute cracks
not visible to the naked eye may be detected by coat-
ing the suspected area with a mixtur e of 25 0/ 0 kerosene
and 75% light motor oil. Wipe the part dry and im-
mediately apply a coating of zinc oxi de dissolved in
wood alcohol. If cracks are present, th e coating will
become discolored at th e defective area.
Inspect the cylinder bores for scores. Check the
cylinder bore for taper, out of round, and wear. Use a
cylinder bore gauge, tele sco pe gauge, or inside micro-
meters. Measuring the cylinder with a cy linder bore
gauge is illustrated in fig. 44. Only experienced person-
nel should be permitted to take these measurements.
Rebore the cylinder when the taper and / or out-of-
roundness exceed the maximum allowable tol era nces.
b. Pistons, Piston Pins, and Rings.
Before remo vi ng a pi ston from the engine, remove
any ridges that may be present alo ng the upper part
of each cylinder as follows:
Move the piston to the bottom of its travel, and
place a cloth on the piston head to collect the cuttings.
Remove the cylinder ridge as shown in fig. 45, accord-
ing to the instructions furnished by the manufacturer
of the ridge cutter being used.
CAUTION: Never cut into the ring travel area in
excess of 1/ 32 inch wlren removing ridges.
Remove the ridge cutter from the cylinder bore.
Turn the crankshaft until the piston is at the top of
its
stroke and carefully remove the cloth with the
cuttings from the piston h ead. Remo ve th e pistons.
(1) CLEANING AND INSPECTION. Clean the
piston ring groove s with a rin g groove clean er (fig. 46).
Clean the piston in solvent. Do not use a ca ustic clean -
ing
solution. Make sure the oil ring slots (or holes)
are clean.
In spec t pistons f or fr ac tur es at the ring land s, s kirt ,
and pin bosses. Spon gy, eroded areas near the edge of
the piston top, usu a ll y on the side opposite the valves,
are ca u sed by detonation, or pre-ignition.
Inspect the piston pins for signs of fracture or etch-
in g. Check the pin f or proper fit in the piston and rod
bu shin g.
(2) REPAIRS. R ep lace pistons showing signs of
excessive skirt clearance, wavy ring lands , fr ac tures
or damage from detonation.
Replac e piston pins showing signs of fracture or
etching. Piston pins that show wear or fit loosely in
th e piston or rod bushing should be replaced. Replace
all piston pin retainers.
(3) FITl'lNG PISTONS. To fit a piston in the
cylinder bore , attach a tension scale to the end of a
feeler gauge ribbon which is 1/2-inch wide and which
has the pr ope r thickness. Position the feeler on the
side of the piston 90 ° from the piston pin hol e. In-
ver t the pi ston, then push the piston and feeler into
th e bore so the end of the piston is approximately 5f8-
inch below the top of the block. Keep the piston pin
bore parall el to th e c rankshaft axis. Hold the piston
and pull o ut the feeler ribbon, noting the reading on
th e pull scale (fig. 47).
If the scale readin g is greater than the maximum
•
Fig. 44-Measuring Cylinder Bore

Ford F-750 Specifications

General

Brand	Ford
Model	F-750
Category	Automobile
Language	English