1
Use a brass type scrapertool to remove hard carbon
deposits from nozzle body valve seat.
5.
Clean nozzle valve and polish with tallow and a
wooden polishing fixture. Take care to remove all
traces
of
tallow when finished.
2.
After scraping the carbon, polish the valve seat by
using a round pointed stick dipped in tallow.
Polishing should restore seat to its original finish
unless it’s scored.
3.
Use a special hooked type scraper to clean the
nozzle pressure chamber gallery. The hooked end
of scraper is inserted into the gallery and then
carefully rotated.
6.
Examine nozzle valve and body with a magnifying
glass. If erosion and scoring conditions are found,
renew the valve and body.
7.
Use a lapping plate and compound for flat lapping
of nozzle parts which depend on a lapped surface
for sealing.
A
figure
“8’
motion is used.
CENTERING
4.
Small holes in tip
of
nozzle body can be cleaned
with a fine wire slightly smaller than the size
of
the
hole.
8.
It is essential that the nozzle body
is
perfectly
centered
in
the cap nut when reassembling nozzle.
A
centering sleeve, as shown, is used for this
purpose.
FIGURE
15.
NOZZLE CLEANING
20
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