Yanmar 4JH2E Service Manual page 85

Chapter 3 Fuel Injection Equipment
3. DisaJsembly, ReaJsembly and Inspection of Fuel Injection Pump
~~~~~.;.;.~~~~.;_~~...;.~~~.;_~~..;_~~~~;._~~~~~~~~~~~~41H
Series
(7) Mount the plunger spring upper rest.
NOTE: 1. Be sure to mount the upper rest with the hollow
side facing down.
2. Recheck to make sure that the rack moves
easily.
(8) Mount the plunger spring.
(9) Mount the lower rest on the head of the plunger, and
fit the plunger in the lower part of pump while align-
ing the match marks on the plunger flange and the
sleeve.
Plunger inserting tool
NOTE: II the plunger is mounted in the opposite direction,
the injection volume will increase abnormally and
cannot be adjusted.
3-20
(10) Insert the plunger spring support plate between the
plunger spring seat B (lower) and fuel pump, by put-
ting the handle of a hammer in the lower part of pump
and pushing the roller guide up.
NOTE: 1. Face the roller guide stop groove upwards, and
align it with the stop screw hole on the pump.
.------,
' '
: !Jl--!-J - -
Stop screw hole
: !_. :
Stop groove
' I
2. Check the movement of the rack. The plunger
spring may be out of place if the movement is
heavy - insert a screwdriver and bring it to the
correct position.
3. When replacing the roller guide assembly, fit
shims and lightly tighten:
Standard shim thickness 1.2 mm (0.0472 in.)
Part code number
129155-51600
(11) Make sure that the roller guide stop groove is in the
correct position, and tighten the roller guide stop bolt.
Printed in Japan
AOAJ029-9002