PS Magazine - JANUARY 1979

PS, The Preventative Maintenance Monthly

ISSUE 314

JANUARY 1979
PS Magazine - JANUARY 1979 - Page 30 of 35
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If you're using a Model TDS-3
tach
&
dwell test set (NSN 4910-
00-78±-±549) on your M±±0-series
trUcks' solid state ignition systEm,
watcH your arc.
The caution on the TDS-3 and
solid state ignition is that you
can't get the capacitance pick²
up probe closer than 2 inches tO
the
sparkplug
when
you're
measuring engine speed (the
Reason: Solid state systems put
out more than 35,000 volts, m³re
thA 3 times that of other systems.
If you cl´p the probe to the wire
near the plug, you'Ll get anµarc
Fom plug ¶o probe that'll put y³ur
test set down.
·act is, if s
p
arkplug wires are
deteri³rated or damaged, you can
pUt the set down even if you're at
least 2 inches Fo¸ Probe to plug.
56
So, if you see bad wires, re¹
ºLace them. »hen, ¼ake your
tests.
You can get new pLug wires ½r
th¾m with ¿aÀt Nos. 3±959Á0,
3±95941, 3±95942 and 3±95943.
They're all coded ·SCM ±6403.
Âyeball
TM 9-2320±2²²-20P
(Feb
78)
½r the wires you need if you
don't need a wh³le set.
If the TDS-3 is damaged, your
supp³rt can beef it up by replac¹
ing tÃe RÄÄ and R13 carb³n Ålm
resistoÀs With
Rll
and R13 car¹
bon composition resisÆors (ÇSN
MBBO-SeriEs
1
1
4-Ton
±
Rrucks .²³
±rlL²
and NSN
5905-00-27ÈÉ3504).
The carbon compositi³n resisÊ
tors can wiËstand ¸³re cuÀÀent.
Wheel Stud Saver
DEar ´ditor,
WE had a lot of troublE with our
MBBO whEEl studs bµaking whEn
thE wh¶ls wErE takEn oF during
sChEdulEd sErvicEs· ¸EcausE of
rust and paint ¹n thosE f
i
nE
thrEads, thE stud twistEd oF whEn
thE lug nut was tuº»d
·
ThEn tIE motor pool savEd thE
day by clEaning Each stud with a
wi¼E brush and applying pEnEtrat½
inG oil whilE wo¼king thE nut back
aNd f¾¿h·
ÀPT
L. t
Kukoski
APÁ ÂEw York
(Âd Note: ·³Àewarned is fÌre¹
armed. Íse penetrating oil
befo³e
trying t³ turn the lug nut. Th³se
Îne threads won't hold up if
muscle aL³ne is used to
Ï
bust the
Ðst.).
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