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Westerbeke 4.0Kw BCDB 50Hz Manual de instalación Pagina 37

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ENGINE
ADJUSTMENTS
NOTE:
WESTERBEKE
recommends
that the following
engine
adjust-
ments
be
performed
by
a competent engine
mechanic.
The
information
below
is
provided
to
assist
the
mechanic.
VALVE
CLEARANCE
ADJUSTMENT
Re-install the glow plugs (use anti-seize compound on the
NOTE:
Retorque
the
cylinder head bolts
before
adjusting
the
engine's
valves.
See
TORQUING THE CYLINDER HEAD
BOLTS.
A
WARNING:
Adjust
the
valve
clearance
when
the
engine
is
cold.
Valves
are
adjusted
by
cylinder
in
the
firing
order
of
the
engine.
Tighten
the
cylinder
head
bolts
to
the
specified
torque
before
adjusting
the
valves.
PuB
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 engine to be easily rotated by hand to position each
cylinder for valve adjustment.
Valves are adjusted with the piston
in
the cylinder being
adjusted at
IDe
(top dead center)
of
its compression stroke.
Each cylinder is adjusted following the engine's firing order.
1-3-2 for WESTERBEKE's 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
IDe
mark on the crankshaft front puBey with the
timing marker on the front gear case cover when positioning
the #1
Piston at
IDe
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
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
normal direction
of
rota-
tion and adjust the next cylinder's valves in the firing order.
Rotate the crankshaft another
240 degrees and adjust the next
cylinders valves in the firing order.
Adjust each valve's clearance by inserting a
0.010 inch
(0.25mm) feeler gauge between the rocker arm and the valve
stem. Make sure to adjust all valves while the engine is cold.
threads) and assemble the rocker cover and rocker cover
belts. See the TIGHTENING
TORQUE SCHEDULE
in
this
manual.
TESTING
FUEL
INJECTORS
Remove and check fuel injectors. The injector spray pressure
should be 1988 psi
± 142 psi (140
kglcm
2
±10
kglcm2).
Undesirable 'injector conditions, to include after dripping,
should be eliminated.
INJECTION
PRESSURE
TEST
INJECTION
NOZZLE
GOOD
AFTER
DRIP
TEST
BAD
CHATTERING
TEST
!
SHIM
THICKNESS
O.1mm
O.2mm
O.3mm
O.Smm
For the chattering test, operate the tester level slowly.
If
the
nozzle sprays sharply and intermittently, the nozzle is consid-
ered good. The nozzle should spray fuel straight in its axial
direction. A nozzle is defective if
it
sprays fuel in a wrong
direction,
in
several separate strips, or in the
form
of
particles. These defects may sometimes be caused by clog-
ging with dust, therefore all parts should be cleaned carefully
before reassembly.
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Engines & Generators
31
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