Yanmar 1GM User Manual page 184
One, two & three cylinder engines
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178
CHAPTER EIG HT
Pressure relief valve s
pri
ng
Upper sealing gasket
Lower
seati ng g
as ket
Upper
sealing
surlace
\
~
Safety stop
-::::::::±::
..--:::01
Cam lock ing s
urlace
:;:::::..---........---
cooling
systems and
requires
the same
type
of pressure
tester.
1. Rem ove
the
pressure
fill cap from the heat exchanger.
See
Figure Jl
, typical.
2. Wash the
cap with clean water to remove any debris
or
deposits from
its sealing surfaces.
3.
Check the
gasket.
if
so equ
ipped
,
and rubbe
r
sea
l on
the
cap
for
cuts,
cracks.
tears or
deteriorat ion .
See
F
igu re
32.
Replace the
cap
if
the seal is
damaged.
Ma
ke
sure the
lockin
g tabs
on
the
cap
are
not
damaged or
bent.
4. Dip the cap in water and attac
h
it
to a
cooling
system
pres
sure lester, using
the adapters
supplie d with
the
tester.
Sec
Fi ~ u re
33.
5. Pump the
pressure
to 13 psi (90 kPa).
If
the
cap fails
to
hold pressure for )0 seconds wit
hout
dropping under
11
psi (76 kPa). rep
lace
it.
6
. Inspect the filler nec
k
sca
t
and
sealing sur
face
(Figure
32) for
nicks,
dents
,
distort
ion
or
contamination.
Wipe
the
sca
ling surface
wit
h
a clea
n cloth
to
remove
any
rust or
dirt. Make sure
the
locking cams are not
bent
or
damaged .
7.
Check
coolant
level.
It
shou ld
be
within
I
in. (25.4
mm) ofthc
filler
neck
.
Top ofT if
necessary,
8.
Con
nect
the cooling system
pressu re
tester
to
the
filler
neck and
pressur ize
the
system to 15 psi (104 kPa)
. If
pressur e doe s
not hold constant for at least
""' ·
0
minutes
,
check
all
hoses.
gaskets,
dra
in
plugs,
dra
in valves and
other
potential leak
point
s
for
leakage.
Listen for
a hissing
or bubbling sound while the
sys
tem
is
under
pressure.
9.
If
no
leaks are
found. disconnect
the
seawater outlet
hose
from the
heat exc
hanger
(Figur e 34
). Repressurize
the
system 10
IS psi
(104 kPa
)
and note the outl
et connec-
tion
on the
heat exc
hanger. lf water flow
s
from the
con-
nect
ion,
air bubbles
are
visible in the water or a bubbling
or hissing noise is heard .
there
is probably
a leak between
the fresh
and
sea
water sections within the heal exchanger.
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