Yanmar 3JH3E - 4-3 Adjusting of injection timing

Chapter 3 Fuel Injection Equipment
_4._A_d.:;.ju_s_t_m_e_n_t_o_f_F_u_e_l_I_n.:;.je_c_t_io_n_P_u_m_p_an_d_G_o_v_e_r_n_or ______________ 3,4JH3(B)(C)E
(4) Read the gauge at this position, and adjust until the
clearance is at the specified value by changing adjust-
ing shims.
Tighten
the adjusting screw after completing adjust-
ment.
~Adjusting bolt.
~Adjusting shim
~Tappcl
(Greater shim thickness decreases top clearance and
smaller shim thickness increases top clearance).
NOTE : Adjust while watching gauge, and then tighten.
(5) After adjustment is completed, insert the delivery valve
assembly
and tighten the delivery retainer.
kg ·rn
Delivery retainer tightening torque I 3.5~4.0
Repeat the above procedure to adjust the top clearance of
each cylinder.
4-3 Adjusting of injection timing
After adjusting the top clearance for all cylinders,
check /adjust the injection timing.
Cylinder No.4
Cylinder No.3
Cylinder No.2
Cylinder No.1
Direc1ion of ro1ation
0
)
3-26
(1) Set the governor control lever to the operating position
and
fix (bring plunger to the effective injection range).
turn the
camshaft clockwise, and check the injection
starting time
(FID) of cylinder No.1 (start of discharge
of fuel from the delivery retainer).
Cylinder
no.
Count from the drive side
Direction of rotation
Right baking
from drive side
(2) In the above state, set the tester needle to a position
easy to read on the flywheel sc~.le, and check the
injection timing several times by reading the flywheel
scale, according to the injection order.
Engine model
3JH3(B)(C)E
4JH3(B)(C)E
Injection order
1-2-3-
1
1-3-4-2-1
Injection timing 120·
90·
Allowable deviation
±30'
(3) Readjust the top clearance of cylinders that are not
within
the allowable deviation (increasing adjusting
shim thickness makes injection timing faster, and
decreasing makes it slower).
The change in injection timing effected by adjusting
shims is as follows :
Change
in shim thickness
Change
in injection timing
Cam angle
I Crank angle
0.1mm
o.s· I 1.0·
(4) When you have readjusted top clearance, make sure it
is within allowable values after completing letin adjust-
ment.
mm
Allowable top clearance
0.3
NOTE: 1. All cylinden must be readjusted it any one shows
less than the allowable value.
2. If the top clearance is less than the allowable
value, the plunger will hit the delivery valve
or
the plunger flange will hit the plunger barrel.
Printed in Japan
HINSHJ.H8009