TM 3-1040-276-10
3-8. REPAIRING ENGINE HEAD ASSEMBLY (Cont).
CAUTION
Do not attempt to remove carbon
a. Inspect flowjector (6) for stripped threads and
deposits on valve seating face of
for broken or bent body.
engine head with scraper or abrasive
cloth. This will scratch the face and
b. Check air tube for bends and proper aline-
remove protective chromate coating.
ment by sighting down tube to a point directly
above body between top two fuel spray open-
a. Place lapping board (11) on flat surface (e.g.,
ings.
tool box lid).
c. Check body for clogged openings. Hold fin-
b. Place a few drops of fog oil on lapping board.
gers over two openings and blow air through
fuel intake. Repeat this test for all three open-
c. Rub valve seating surface (5) of engine head
ings.
or engine valve on lapping board using a figure
8 motion.
d. Check for clogged air tube by blowing air
through tube.
d. Rotate engine head or engine valve so even
pressure is applied to different parts until car-
e. If flowjector is damaged or clogged, discard
bon deposits are removed. Wipe dry with rag
and replace with spare.
(item 6, app D).
3-14
