Yanmar 4JH2E Service Manual page 151

Chapter 3 Fuel Injection Equipment
19. Pump Reassembly,Adjustment and Inspection
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Key way
Fig. 7
K
Fig.
8
Fig. 9
3-86
6. Drive Shaft Key Way and Pin
Groove
Visually check that the drive shaft key way and
plunger pin groove are properly aligned.
7. Plunger Position Adjustment
a) VE type pump without plunger pre-stroke
Adjust the plunger position in the distributor
head so that the dimension "K" is as speci-
fied. "K" is the distance from the end face
of the distributor barrel to the plunger tip
when the plunger is in the bottom dead
center position. Adjust the shim [(52) in Fig.
25) on the plunger bottom, referring to the
specified "K" dimension.
Clearance "K": 3.3
±.i
mm
b) VE type pump with plunger pre-stroke
The plunger position must be adjusted by
checking the port closure point hydraulically
on a pump test bench. With the plunger in
the bottom dead center position, apply feed
pressure of 0.2 Kg/cm
2
.
Test oil should flow
out of the measuring device over-flow tube.
Manually rotate the pump in the proper
direction. Read the dial indicator when test
oil stops flowing, and adjust the shim [(52)
in Fig. 25] on the plunger bottom so that
the dial reading is as specified.
Printed in Japan
AOA1029-9109SP