Surface
A s s e m b l e Injector
Use an extremly clean bench to work on
which may Requ'ire Lapping
and to place the parts when assembling
an injector. Also be sure all of the in-
2. Spread a good quality 600 grit dry
jector parts, both new and used, are
lapping powder on one of the lapping
clean.
blocks.
Study Figure 11C-34 on page 11C-20
3. Place the parts to be lapped on the
through Figure 11C-37 on page 11C-22
block as shown in Figure 11C-33 on page
for the proper relative position of the in-
11C-20 and, using a figure eight motion,
jector parts, then proceed as follows:
move it back and forth across the block.
Do not press on the part, but use just
ASSEMBLE INJECTOR FILTERS. Always
enough pressure to keep the part flat on
use new filters and gaskets when reas-
the block. It is important that the part
sembling an injector.
be kept flat on the block at all times.
1. Insert a new filter, dimple end down,
4. After each four or five passes, clean
slotted end up, in each of the fuel cavi-
the lapping powder from the part by
ties in the top of the injector body (see
drawing it across a clean piece of tissue
placed on a flat surface and inspect the
parts. Do not lap excessively.
NOTE
5. Place the dry part on the second
Install a new filter in the inlet side
block. After applying lapping powder,
(located over the injector rack) in
move the part lightly across the block in
a fuel injector with an offset body.
a figure eight motion several times to
No filter is required in the outlet
give it a smooth finish. Do not lap ex-
side of the offset body injector.
cessively. Again wash the parts in
cleaning solvent and dry it with com-
pressed air.
2. Place a new gasket on each filter cap.
L u b r i c a t e the threads and install the filter
6.
Place
the
dry
parts
on
the
third
caps. Tighten the filter caps to 65-75
lb-ft (88-102 Nm) torque with a 9/16"
block. Do not use lapping powder on
this block. Keep the part flat and move
11C-15).
it across the block several times, using
the figure eight motion. Lapping the
3. Purge the filters after installation by
d r y p a r t s i n this manner gives it the
"mirror" finish required for perfect seal-
directing compressed air or fuel through
the filter caps.
ing.
7. Wash all of the lapped parts in clean
fuel oil and dry them with compressed
air.
Fuel System and Governor