ENGINE SYSTEMS
79
15) Injection pump assembly
➀ Fit the shim which has been removed at the time of
disassembly, connect the control rack of the
injection pump and link, and fix with the snap pin.
➁ Tighten the injection pump with bolts and nut.
Injection pump tightening torque
5 ~ 7 N·m (0.5 ~ 0.7 kgf·m)
16) Injection timing adjustment
Usually the injection timing is adjusted properly by the
step of the order 15.
When the injection pump, cam shaft assembly or
cylinder block is replaced, adjust the injection timing in
the following procedure.
➀ Install the injection pump inserting a shim of 0.5
mm in thickness according to the procedure of
order 15.
➁ Remove the delivery valve holder on the injection
pump front side (radiator side).
➂ Extract the delivery valve and spring and reinstall
the delivery valve holder.
➃ Move the governor lever in the fuel increasing
direction and flow the fuel near 25° before
compression TDC of the No. 1 piston (front side)
and then the fuel flows out of the delivery valve
holder.
➄ Turn the crankshaft gently clockwise from the
condition of above (4), and then the fuel flowing
out of the delivery holder stops. Read the piston
position before TDC at this time. If it is late more
than 24° decrease the shim thickness and if earlier
more than 24°increase the shim thickness.
65
66
Engine Model
S753·S773
Injection timing
(before TDC)
24°
Piston displacement
(before TDC)
4.08 mm
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