Mitsubishi diesel engines Service Manual page 105

FUEL SYSTEM - DISASSEMBLY, INSPECTION AND REASSEMBLY
(1)
Removing the tappets
(a)
Open the claws of the lock plate using a
screwdriver or other similar tool.
(b)
Rotate the tappet and the guide pin by 180º to
align the guide pin cutout with the mating
portion of the pump housing.
(c)
While pressing the tapped down, remove the
tappet guide pin using a pair of pliers.
Hold the tappet, otherwise it will jump out. Be
careful not to drop the tappet.
(2) Removing the plungers
(a)
Remove the tappet adjusting shim.
(b) Using a pair of tweezers, pull out the spring
lower seat and the plunger together.
(c) Remove the plunger spring.
(d)
Remove the spring upper seat and the control
sleeve together.
(e)
Pull out the control rack.
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Removing the tappet guide pin
Removing the tappet
Removing the plunger