word "TOP" on gasket is visible.
Be careful not to
dislodge grommets as gasket is lowered over
grommet retainers.
f.
Using cylinder head lifting plate (45, fig.
B-28) as shown in figure 2-19, capscrews, lift head
with suitable hoist and lower into place over
dowels.
g.
Blow all liquid and dirt from cylinder head
capscrew holes with compressed air.
CAUTION
Keep rust preventative oil from internal
engine parts to prevent corrosive dam-
age.
h.
Coat short cylinder head capscrews with
*TM 9-2815-213-34
rust preventive lubricant and install.
Tighten each in
sequence shown in figure 3-48.
Section XIV.
Repair of Fuel Injectors
3-71.
General
This section covers the disassembly, inspection,
repair, assembly and testing of injectors (fig.
3-49).
The injector is a simple mechanical unit which
receives fuel from the fuel pump, under pressure,
and injects it through fine injector cup spray holes
into the combustion chamber.
The description "PT
Injectors" is only used to in the cate that the injector
is used with the PT fuel systems.
The PT injectors
are mounted in the cylinder head and are cylindrical
in shape.
’The V8-300 engine uses of PT type C
injector.
It consists of two major assemblies: injector
body and plunger; and the injector cup.
The orifice
descriptions below are given for functional main-
tenance purposes.
a.
Adjustable Orifice Plug.
The orifice plug
used in the inlet drilling of the cylindrical injec- tor
adjusts delivery of fuel.
Fuel delivery is ad- justed by
changing the orifice plug or by burnish- ing the plug in
operating position.
Some ori plugs have a flange and
require a gasket bene the flange.
b.
Drain Orifice.
The drilled orifice in cup E
of the injector is the drain drilling.
This orifice is fixed
in size and must not be altered in any way.
c.
Metering Orifice.
The orifice in cup end
of the injector allows fuel to enter plunger bore and
cup; do not alter in any manner.
3-72.
Disassembly
(fig.
3-49).
a.
Lift out injector plunger and spring.
Tag
mating parts.
NOTE
Injector bodies and plungers are class fits, do not
interchange.
b.
Remove and discard O-Rings
from injector
body.
c.
Disassemble clamp securing screen to injector
body.
NOTE
Do not remove adjustable orifice plug from inlet
groove.
d.
Place injector in injector cup wrench (30,
fig.
B-28) and install in injector holding fixture
(29, fig.
B-28) as shown in figure 3-50.
e.
Remove injector cup; note size markings on
injector body for future reference.
f.
Remove ball retainer, ball, and gasket from
top of injector body, discard gasket.
g.
Place injector plunger in suitable holding
device with spring retainer upward.
h.
Pull link and retainer as an assembly.
i.
Using a collet type hand tap holder, pull
injector links (fig.
3-51).
3-73.
Cleaning
Clean injector components in accordance with paragraph 2-
5.
3-74.
Inspection
Perform general inspection of components in accordance
with wear limits in repair and rebuild standards (para.
3-183).
Detailed inspection of injector components follow.
3-23