TM-3-1040-279-12-P
GENERATOR SET, SMOKE, MECHANICAL: PULSE JET, M157 W/120 GAL FOG OIL TANK AND W/80 GAL FOG OIL TANK
TECHNICAL MANUAL; OPERATOR’S AND ORGANIZATIONAL MAINTENANCE MANUAL INCLUDING REPAIR PARTS AND SPECIAL TOOLS LIST AND DEPOT MAINTENANCE REPAIR PARTS
MAY 1987
TM-3-1040-279-12-P - Page 59 of 389
TM 3-1040-279-12&P
NOTE
Engine head is still usable if chromate coating is removed. However, head
must have sharp (not rounded or chamfered) seating face corner edge.
4.
Inspect engine head (6) for wear, burrs on engine head index slot (8), clogged ports (9), and
carbon deposits on valve seating face (10). If ports are clogged, wipe ports with twisted comer of
rag soaked with dry cleaning solvent. Remove carbon deposits on valve seating face as described
in step 5. If badly damaged, notify organizational maintenance.
5. Clean engine head:
CAUTION
Do not attempt to remove carbon deposits on valve seating face of engine
head with scraper or abrasive cloth.
(a)
Place lapping board on flat surface.
(b)
Place a few drops of fog oil on lapping board.
(c)
Rub valve seating face (10) of engine head on lapping board using a figure 8 motion. Ensure
engine head seating surface stays flush on lapping board. Do not round edges.
(d)
Rotate engine head or engine valve so even pressure is applied to different parts until carbon
deposits are removed. Wipe dry with rag.
Change 4
3-11
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