PS Magazine - TB 43-PS-554
PS, The Preventative Maintenance Monthly
ISSUE 554
JANUARY 1999
he new engine head blank, NSN
4910-01-449-5335, can’t help you
troubleshoot the igniter if your repair-
men don’t know how to use it. Here’s
the scoop:
Before starting, remember that this
is a two-man job, so get help. Never
test for spark without the engine
head or blank installed. They prevent
flashback.
1.
Set the circuit breaker CB1 and the
power switch to ON. (M157A2: Set
CB1 to ON.)
M157/ M157A2
Smoke Generator . . .
8.
If there is a spark, set all switches
and CB1 to OFF, replace the igniter,
and check for spark in the combustion
chamber.
6.
If there’s a spark, set all switches to
OFF, reinstall the head and continue
troubleshooting for adequate fuel/air.
15 seconds—and check the igniter’s
spark in the combustion chamber.
Set CB1 breaker to ON
Look for spark in chamber
7.
If there is no spark, set all switches
to OFF and disconnect the ignition
cable from the igniter. Set the power
switch and CB1 to ON. (M157A2: Set
CB1 to ON.) Hold the end of the ignition
cable
1
/
4
inch from the metal frame.
Hold the engine switch to START.
No spark? Hold ignition
cable
1
/
4
inch from frame
2.
Turn the fuel switch on the control
panel to OFF and purge any remaining
air from air compressor. (M157A2:
Turn
ball valve to OFF.)
3.
Disconnect the air supply line.
4.
Remove the engine head and replace
it with the blank.
5.
Hold the engine switch in
START—but no longer than
DON'T
DRAW
A
BLANK,
USE
A
BLANK.
..
...AN
ENGINE
HEAD BLANK
TO
TROUBLESHOOT
MY IGNITER,
THAT IS!
PS 554
38
Replace igniter
9.
If there is still no spark, set all
switches and circuit breaker CB1 to
OFF, and check the ignition cable con-
tinuity. If the cable’s OK, replace the
coil and continue troubleshooting for
adequate fuel/air.
Install blank
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