PS Magazine - TB 43-PS-581
PS, The Preventative Maintenance Monthly
ISSUE 581
APRIL 2001
se your head when it comes to the engine
head on M157-series smoke generators. If you
use the same head over and over again and
never clean it, the head gets caked with carbon
and eventually warps. Then the head seals
poorly and you have trouble starting your
M157 and keeping it running.
Step 4 of the PMCS in TM 3-1040-279-
12&P says to check the head weekly. Do it!
Look for signs of wear, especially for rounded
areas on the seating face. That means the head
won’t seal well and it needs to be replaced.
PS 581
APR 01
47
PS 581
APR 01
46
M157-Series Smoke Generators.
..
If the valve petals are bent or burnt, replace the valve. If the ports are clogged, dip
a rag in dry cleaning solvent and clean them out.
If the head’s face is caked with carbon, put a few drops of fog oil on the lapping
board and rub the face flat on the board in figure eights until the carbon is removed.
Valve petals
burnt or bent?
Use lapping board
to clean face
Clean clogged ports
with rag and dry
cleaning solvent
Take extra valves to the field—you’ll probably need them. Keep the extra valves
in something like an old shoe polish can to prevent them from getting banged up.
Use can to
protect valves
Check for rounded
areas on seating face
581. 46-47 (C)
2/28/01
2:19 PM
Page 1
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