PS Magazine - MARCH 1981
PS, The Preventative Maintenance Monthly
ISSUE 340
MARCH 1981
r
l
,I
system. Your battery's negative ter-
minal is connected to the chassis±
usually the eNgiNe or the framE. This
means that all of your electrical
components with "chassis ground² are
connected to the battery's negative
terminal thrOugh the chassis.
That oil pressure gage, Frinstance,
is connected to ground by the moun³
ting bracket. The mounting bracKet
must make solid contact with clean,
The bottom mounting
stud is connected
directly to ±he
electRical system
inside the gAge
for gRoundinG
Mounting
bRacket and
ground
connectoR
²t least
1
of the
4
points
on the mounting bracket must
make contact with clean,
bare metal of the instrument
panel. Make suRe! ScRape oFf
paint, diRt oR grease where
the bracket touches the panel
"Hot³ wire
connection
fRom senDiNg
unit
"Hot³ wiRe
connection
to positive side
( +) of battery
bare metal´no paintµ dirt or greas¶.
Poor contact between the mounting
bracKet and the chassis means poor±
oR no·contact WI¸H tH¶ BA¸¸¶R¹ºS
n¶gAtive t¶RMinAL. »H¶ GAG¶ Wonº¸
WoR¼!
26
M9±
C-HET .²³
T½ose are throw¾away air filter
elements on the ¿911 CÀÁÂT.
c±:;²³´=µ¶·¸¹º»¼½¾j
Ja
p
agAinst
´Aµ¶
surAc
to ´leµn
You dÃn't clean ÄemÅ
T¿ 9À2320À270Æ20Ç Page 3Æ6Ç Task
13Ç says to clean the elements with
compressed air or by washing them.
Èoth methoDs are taboo. Éibers are
disrupted´some filtering capability is
losÊ.
WAsING
wr
¶
c
kS
m·¸ ¹iR fºl»¶¼S
Ëeplace both elements annually or
wheÌ
Í
the air resÎriction indicator
Ï
tuns red. Áere they are:
NSn ±90-²14³´7µ63
.±²
P½¾¿ÀÁy
.
\
.±
NÂÃ 2ÄÅ0ÆÇÈÉ5ÊË3ÌÍÎ
³´³
seco¶daRy
·¸
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