Specifications
ENGINE
ADJUSTMENTS
VALVE
CLEARANCE
ADJUSTMENT
NOTE:
Retorque
the
cylinder head bolts before adjusting
the
engine's
valves.
See IDRQUING THE CYLINDER HEAD
BOLTS.
A
WARNING:
Adjust
the
valve
clearance
when
the
engine
is
cold.
Valves
are
adjusted
by
cylinder
in
the
fir-
ing
order
of
the
engine.
Tighten
the
cylinder
head
bolts
to
the
specified
torque
before
adjusting
the
valves.
Pull off the air breather pipe from the rocker cover and take
off the rocker cover bolts and the rocker cover to expose the
rocker shaft and valve assembly.
Remove the glow plugs from each
of
the cylinders to enable
the crankshaft
to
be easily rotated
by
hand to position each
cylinder
for
valve
adjustment.
Valves·are adjusted with the cylinder
in
the piston being
adjusted
at
Top
Dead Center
(IDC)
of
its
compression
stroke.
Each
cylinder
is
adjusted following the engine's firing
order (1-3-2
for
WES1ERBEKE three cylinder engines).
Valve adjustment beginning
with
cylinder #1. Rotate the
crankshaft slowly and observe the operation
of
the valves for
cylinder #1.
Watch
for the intake
valve
to
open indicating the
piston
is
on
it's intake stroke (the piston
is
moving down in
the cylinder). Continue to rotate the crankshaft slowly and
look
for
the intake valve to close. This indicates the piston is
now starting it's compression stroke (the piston is moving
up
in the cylinder towards
IDC).
Align the
IDC
mark on the crankshaft front pulley with the
timing marker
on
the front gear case cover when positioning
the
#1
Piston at
IDC
of
it's compression stroke. Confirm this
by rotating the crankshaft approximately
20
degrees before
and after
this
point and the two valves
for
the
#1
cylinder
should not
move.
VALVE
CLEARANCE
~,,,~=.mnn~
~
0.25
mm
(0.010
in)
~
I
COLD
ENGINE
~
Adjust the
valves
in
#1
cylinder for both intake and exhaust.
Proceed
to
the next cylinder in the
firing
order.
Rotate the crankshaft 240 degrees in
the
normal direction
of
rotation
arid
adjust the next cylinder's
valves
in
the firing
order. Rotate the crankshaft another
240
degrees and adjust
the
valves
of
the next cylinder
in
the
firing
order.
Adjust each valve's clearance by inserting a
O.OlOin
(0.25mm) feeler gauge between the rocker arm and the valve
stem. Make sure to adjust all valves while the engine is cold.
Re-install the
glow
plugs (use anti-seize compound
on
the
threads)
and
assemble the rocker cover and rocker cover
bolts. See TIGH1ENING TORQUE SCHEDULE
in
this
manual.
ENGINE
COMPRESSION
Check the compression pressure.
To
do
this wann
the
engine,
remove
all
fuel
injectors, or
glow
plugs, disconnect the
fuel
shut-off solenoid
wire,
and install a compression adapter
in
the injector hole or
glow
plug
hole.
Connect a compression
tester
on
the adapter and crank the engine with
the
starter
motor until the pressure reaches a maximum
value.
Repeat
this process for each cylinder. Look
for
cylinders
with
dra-
matically (at least 20%) lower compression
than
the average
of
the others. Compression pressure should not differ
by
more than 35.5 psi
(2.5
kglcm2)
at 280
rpm.
Standard
compression
pressure
398
Ib/iR'
at
280
rpm
(28.0
kg/em')
IT
a weak cylinder
is
flanked
by
healthy cylinder, the problem
is
either valve or piston related. Check the
valve
clearances
for the weak cylinder, adjust
as
needed and test
again.
If
the
cylinder is still
low,
apply a small amount
of
oilmto the
cylinder to seal the rings and repeat the test.
If
compression
comes up - the rings are
faulty.
Abnormally high readings
on
all
cylinders indicates heavy
carbon accumulations, a condition that might
be
accompanied
by
high
pressUres
and noise.
NOTE:
In
case
of
severe
vibrations and detonation
noise,
the
cause may be fuel injector
problems,
see
FUEL INJEC-
mRS.
Poor fuel
quality,
contaminates and
loss
of
positive
fuel pressure
to
the
injection pump will result
in
injector
faults.
When re-installing the
glow
plugs use anti-seize compound.
COMPRESSION
TESTER
ADAPTER~
,~r-
_____
INJECTOR
OR
~~
GLOW
PLUG
HOLE
Engines & Generators
23