Yanmar 4LHA-HTP Operation Manual page 403

Chapter 3 Fuel Injection Equipment
9. Pump Reassembly, Adjustment and Inspection
Knock pin
Pin groove
Distributing slit
Fig. 7
Fig. 8
Key way
Drive disc
3-1-46
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
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 0.02MPa(0.2 kgf/cm
should f l o w out of the measuring d e v i c e
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.
, 4LHA Series
mm
± 1
). Test oil
2