Komatsu 4D98 Series Shop Manual page 90

7.
Fuel Injection System/Governor
Point 7
Disassemble:
l
Set the drive side cam at the TDC and
pull the camshaft toward the drive side
for removal.
Point 8
Disassemble:
l
For tappet removal, push the tappet
roller up with the tappet insert from be-
low to remove the tappet holder, and
take the tappet out from the camshaft
hole with the clamp.
Zexel's codes
Tappet insert: 15792
Clamp:
15793
l-0120
l-6120
(6)
Parts inspection and measurement
(6.1) Pump housing
Mainly check for crack, wear and damage
at threaded hole.
(6.2) Springs (plunger and delivery)
Mainly check for surface defect, crack,
uneven wear, corrosion and rust.
(6.3) Plunger & barrel
Check for surface defect, uneven corro-
sion and wear mainly at the lead portion.
After washing, tilt the barrel by around
60".
Pull the plunger out and release it. The
state is normal if the plunger slips down
smoothly by its own weight. Test several
times while turning the plunger to different
angles.