Hunter 50 - Transmissions and Operations; Hydrolock and Engine Exhaust Safety

Hu
nt
e
r
50
• En
g
ines and Transmissions
11.4
The raw water coolin
g
s
y
stem is described in detail in
y
our “Water S
y
stems”
(
section 9
)
of this manual. The
internal en
g
ine coolin
g
s
y
stem is supplied b
y
the en
g
ine
manu
f
acturer. This s
y
stem
f
eatures a closed anti
f
reeze
c
oo
l
ant
b
ott
l
e
d
i
n a reservo
i
r attac
h
e
d
to t
h
e en
gi
ne.
C
oolant is circulated throu
g
h the en
g
ine in separate
c
hannels than the raw water coolin
g.
Note: Be sure the engine seacocks are open before you start
the engine. Failure to open them will cause damage to the
water pump impeller.
DA NG ER
! !
b
urns or ot
h
er persona
l
i
n
j
ur
y
w
h
en pressure cap
i
s
r
emoved. Allow en
g
ine to cool. Open pressure cap
slowl
y
to allow pressure to vent before removin
g
c
a
p.
1
1.1.5 Emer
g
enc
y
Equipmen
t
Your en
g
ines are set up to operate under the tou
g
hest
c
onditions. However, should the oil pressure become
too
l
ow, or t
h
e en
gi
ne over
h
eat, a
l
arms w
ill
soun
d
at
th
e
h
e
lm. Th
e
r
e
a
r
e
se
v
e
r
a
l
co
n
d
iti
o
n
s
th
a
t will
sou
n
d
an alarm and save
y
ou
f
rom dama
g
in
g
y
our en
g
ines.
B
e sure an
d
stu
dy
y
our
d
ocumentat
i
on supp
li
e
d
by
t
h
e
e
n
g
ine manu
f
acturer to ensure
y
ou will know what the
alarm means should one sound on
y
our boat.
11.2 Transmission
s
The transmission has a reduction
g
ear which drives
the
p
ro
p
eller at a slower rotation s
p
eed than that of the
e
n
g
ine.
g
C
onsult
y
our
O
EM manual for complete transmission
in
fo
rm
a
ti
o
n.
11.3 O
p
erations and Maintenanc
e
In the Underwa
y
C
hapter,
(C
hapter 12
)
y
ou will
f
ind
instructions on startin
g
y
our en
g
ines. Also detailed in the
manufacturer’s documentation supplied with
y
our boat,
y
ou will
f
ind instructions on maintenance items that
y
ou
ma
y
perform
y
ourself. Should
y
ou have an
y
questions
re
g
ar
di
n
g
ma
i
ntenance or operat
i
ons not prov
id
e
d
,
b
e
sure and consult
y
our boat dealer.
Important: Shift the transmission only when the engine speed
is at or below 1000 rpm. Shifting at higher engine speeds could
severely damage the boat, the transmission, and the engine.
Allow the transmission to remain in neutral for a few seconds
before reversing the rotation of the propeller.
1
1.3.1 H
y
drolock
Hyd
ro
l
oc
k
i
s cause
d
by
water enter
i
n
g
t
h
e en
gi
ne c
yli
n-
ders throu
g
h the exhaust. The
f
ollowin
g
conditions can
c
ause h
y
drolock.
E
n
g
ine shutdown: A sudden en
g
ine shutdown while the
boat is movin
g
ma
y
f
orce water into the exhaust s
y
stem.
Anchored or adri
f
t: Rou
g
h seas ma
y
cause rockin
g
severe enou
g
h to cause water to splash out o
f
the mu
f
-
flers into the en
g
ine while the en
g
ines are shut down,
anchored
f
rom the stern, pullin
g
a sea anchor, or adri
f
t.
Improper hoistin
g
:
O
perators are sometimes tempted to
reduce hoistin
g
time
f
or propeller chan
g
es b
y
hoistin
g
onl
y
the boat stern.
S
uch hoistin
g
can cause residual water in
t
h
e ex
h
aust s
y
stem to enter t
h
e en
gi
ne c
yli
n
d
ers.
WARNING
! !
E
n
g
ine manufacturers do not warrant
y
items dam-
ag
e
d
by
hyd
ro
l
oc
k.
1
1.3.2 En
g
ine / Generator Exhaus
t
Your en
g
ine exhaust contains
C
arbon Monoxide! Be
sure and read the Boatin
g
S
a
f
et
y
C
hapter and know
the dan
g
ers and how to avoid them. Carbon Monoxide
will kill
y
ou, and in most situations, b
y
the time
y
ou
k
now somethin
g
is wron
g
it could be too late. Know
.
Oil filler ca
p
.
Dipstic
k
Fi
g
. 11.
3