Fuel Injection Timing - Westerbeke 8.0KW-60Hz Service Manual

FUEL INJECTION TIMING
Preparation
a. Close the fuel shut-off valve.
b. Disconnect the No.1 fuel injection pipe from the
cylinder head and injection pump.
c. Remove No.l delivery valve holder from the injection
pump. Remove the delivery valve and spring from the
holder. Restore the delivery valve holder only to the
injection pump.
d.Connect the fuel injection pipe to the injection pump.
e. Hold the speed control lever in the low speed position.
(Generator) remove the fuel shut-off solenoid.
Inspection [fuel flow method]
a. Open the fuel shut-off valve. Tum the key switch to the
ON position and press preheat.
In the fuel flow method. the delivery valve has to be removed.
As a result, there is a good chance for dirt particles to get
inside the fuel injection pump. In this alternate method, how-
ever, it is not necessary to remove the delivery valve.
a. Disconnect No.1 fuel injection pipe at the fuel
injection nozzle (cylinder head).
b. Prime the fuel system.
c. Slowly tum the crankshaft clockwise until fuel just
swells at the free end of the injection pipe and, at that
instant, check the position of the IT mark with respect
to the mark on the gear case. This timing is
approximately I' retarded. Take this I' retardation
into account when making a shim adjustment.
Adjustment
a. If the fuel injection timing is incorrect, change the
thickness of shims under the fuel injection pump. An
increase or decrease of the shims by 0.1 mm (0.004 in)
will vary the timing by 1°.
b. Increase the thickness of the shims to retard the timing
or decrease it to advance the timing.
ADJUSTMENT RANGE: STANDARD
±
1.5'
Four kinds of shims are available in thicknesses
0.2mmm (0.0079 in), O.3mm (0.0118 in), OAmm
(0.0157 in) and 0.8mm (0.0315 in). These shims have
no identification, measure the thickness of each shim
with calipers before using it.
A
CAUTION:
Apply sealant to both faces of each
shim to prevent oil leaks.
c. After the timing has been adjusted, make sure it is
COrrect.
d. Close the fuel filter valve and restore the delivery valve
and injection pipe to the original state.
TDC MARK
ANGLE BY WHICH FUEL
INJECTION TlMING1?(
' ' ' ' ' M GJ
,
9)
17' 19'
~
20'
23'
ANGLE BY WHICH FUEL
INJECTION TIMING
0
ISADVANCEX,
--0'
~
INCREASE SHIM
THICKNESS
DECREASE SHIM
THICKNESS
r---L-I---'--./
~~~1~.
ADVANCED /
Engines
&
Generators
39