ENGINE
ADJUSTMENTS
NOTE:
UNIVERSAL recommends that the following engine
adjustments be performed
by
a competent engine mechanic.
The infonnation below is provided
to
assist the mechanic.
NO!IMAI,LYI?PEIV
5
PSI
RAfEO
TESTING
ENGINE
COMPRESSION
Make certain the oil level (dipstick) is
at
the correct level and
the
air
intake filter is clean.
The
battery
and
starter
motor
must
also
he
in good condition.
1. Warm the engine to normal operating temperature.
2.
Move
the control lever to a position for shutting
off
the fuel.
(Disconnect
the
wires
if
a fuel
shutdown
solenoid is used).
3. Remove all the
glow
plugs from the engine and install the
compression gauge/adapter combination to the cylinder on
which the compression
is
to be measured.
MEASURING
COMPRESSION
~
DIAL
GAUGE
4.
Close
the raw
water
seacock
(thru-hull).
5.
Crank
the
engine
and
allow
the
gauge
to reach a
maximum
reading. Record the reading.
6.
Repeat
this process
for
each
cylinder.
COMPRESSION
PRESSURE
412
•
469
psi
12.84·3.23
MPal
at
cranking
speed.
MAXIMUM
PERMISSIBLE
DIFFERENCE
BElWEEN
CYLINDERS
IS
10%
OR
LESS.
LIMIT
327
psi
12.25
MPal
NOTE:
If
the readings are below the limit, the engine needs an
overhaul.
7.
Re-installthe
glow
plugs
(use
anti-seize
compound
on
the threads)
and
reset the fuel shut-off to the run position.
S.
Open
Ibe
raw
water soacock
(lbru-hull).
OIL
PRESSURE
The
engine's
oil pressure, during operation, is indicated
by the
oil
pressure
gauge
on
the instrument panel.
During
normal operation, the oil pressure will range between
40
and
60 psi (2.8
and
4.2
kg/cm').
NOTE:
A newly staned, cold engine can have
an
oil pressure
reading up to
60
psi (4.2 kg/ctri'J. A warmed engine can have
. an oil pressure
I~ading
as low
as
35 psi (2.5 kg/cm'
J.
These
readings will vary depending upon the temperature
of
the
engine
and
the rpms.
Low
Oil
Pressure
The specified safe
minimum
oil pressure is 5 - 10 psi. A
gradual loss
of
oil pressure usually indicates a worn bearings.
For
additional infonnation on low oil pressure
re~dings,
see
the ENGINE TROUBLESHOOTING chart.
LIFT
PUMP
+
BATTERY
GROUND
...
OIL
PRESSURE
Testing
Oil
Pressure
To
test the oil pressure, remove the oil pressure sender, then
install a mechanical oil pressure gauge in its place. After
warming
up the engine,
set
the engine
speed
at
idle and read
the oil pressure gauge.
OIL
PRESSURE
7
psi
(49
KPal
alldle
speed.
SENDER
AND
SWITCH
TORQUE
9 ·13
R·lh
(1.2
·1.8 m •
kg).
FUEL
INJECTORS
OIL
GALLERY
IM-50B
SHOWN]
In case
of
severe vibrations and detonation noise, have the
injectors checked
and
overhauled by an authorized fuel
injection service center.
Poor
fuel quality, contaminants and
loss
of
positive fuel pressure to the injection
pump
can
result
in
injector faults. Since fuel injectors must be serviced in a
clean room enviroment,
it is best to carry at least one extra
injector as a
spare
should a problem occur.
Before removing the old injector, clean the
area around the
base
of
the injector to help prevent any rust or debris from
falling
down
into the injector hole.
If
the injector will not lift
out easily and is held in by carbon build-up
or
the like, work
the injector side-to-side with the aid
of
the socket wrench to
free it, and then lift it out.
The
injector seats in the cylinder head
on
a copper sealing
washer. This washer should be removed with the injector,
replace with a new washer
when
the new injector is installed .
INJECTOR
TO
CYLINDER
HEAD
TORQUE
±4
R·lh
(5.5
±0.5
kgl·m)
FUEL
INJECTOR
•
.Unlvarsal
28
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