(j) Thoroughly rinse the valve and
valve body in clean diesel fuel or
calibrating oil. The valve must fit
freely in the valve body. To check
this fit, lift valve about one third of
its length out of the body. The
valve should slide down to its seat
without aid when assembly is held
at a 45 ngle. If the fit of the valve
in the valve body is unsatisfactory,
the valve may be cleaned and
polished with 1,000G lapping
compound and castor oil used on
tissue paper. The valve may be
Figure 47. Lapping fuel injection nozzle valve
held by its stem in a revolving
chuck for this cleaning operation.
An orange stick or round toothpick
It is important that the valve body be
will be helpful in cleaning the valve.
centered in the nozzle retaining nut.
Hard or sharp tools, emery cloth,
Use care while tightening the nozzle
crocus cloth, jeweler's rouge,
retaining nut so that the valve body
grinding compounds, or other
remains centered in the nut.
abrasives should never be used in
(n) Test and adjust the fuel injection
Refer to preceding
(k) Thoroughly rinse the valve in clean
diesel fuel before installing it in the
(4) Nozzle Holder Disassembly, Cleaning,
(l) Examine the flat sealing surface of
of the fuel injection nozzle holder was not
the valve body (surface which
corrected by removal and cleaning of the
contacts lower end of the holder
body) and make certain surface is
disassemble and clean the nozzle holder
clean and free of scratches. This
(a) Clamp nozzle holder assembly in a
necessary, using 1,000G lapping
copper-jawed vise and remove the
compound, castor oil, and a lapping
protection cap and gasket from
upper end of nozzle holder. Loosen
lapping, remove all traces of
and remove the pressure adjusting
lapping compound with clean diesel
screw locknut and gasket.
(b) Remove pressure adjusting screw,
(m) Make certain that the bottom flat
spindle spring, and spindle.
sealing surface of the nozzle holder
body is clean and in good condition.
(c) Remove nozzle retaining nut,
Rinse the valve and valve body in
nozzle valve body, and nozzle
clean diesel fuel, then insert valve
into position in the valve body.
(d) Place all parts in clean diesel fuel.
Place the valve body and valve in
Using filtered compressed air, blow
position on the end of the nozzle
out the fuel passages in the holder
holder body and center the valve
body with the holder body. Install
(e) Visually inspect the parts for
and tighten the nut to a torque of
damage or wear; replace necessary
60-80 ft. lbs.
Examine the flat sealing