Yanmar 4LHA-DTP, Operation Manual

Page: 454 / 670

Chapter 3 Fuel Injection Eguipment
4. Adjustment of Fuel Injection Pump and Governor
4LHA Series
14
(Stroke)
Rack indicator
Part number
121978-51500
(5) Check the control rack stroke
Make sure the rack position is at 14±0.5 mm on
the indicator scale when the governor control
lever is set at the maximum operating position.
If it is not at this value, change the link connect-
ing the governor and control rack.
NOTE: Links are available in 1 mm (0.0394 in.)
increments.
(6) Remove the plug in the oil filler port of the gover-
nor case, and fill the pump with about 400 cm
3
of
pump oill or engine oil.
Plug
(7) Complete fuel oil piping and operate the pump
tester to purge the line of air.
(8) Set the oil feed pressure from the pump tester to
the injection pump at the pressure specified in the
separate service data sheet.
4-2 Adjustment of pre-stroke
(1) Remove the delivery valve holder of N o . l cylinder.
Remove the delivery valve spring, delivery valve
and gasket.
(2) Screw the pre-stroke measuring device in the screw
hole on the top of pump.
(3) Set the control rack to the full throttle position,
find the bottom dead center of the plunger while
rotating the pump by hand, and set the dial in-
dicator to zero.
Pre-stroke measuring device
3-2-32