Komatsu 4D98 Series Shop Manual page 89

7. Fuel injection System/Governor
Point 3
Disassemble:
l
Governor housing removal (See 7.5(l) governor
components.)
4 To remove the flyweight from the camshaft,
first use the special wrench (1579150100)
and remove the camshaft nut and spring
washer. Then, screw the extractor (157926-
51 10) into the flyweight holder threaded por-
tion and remove the flyweight assy.
W
To remove the governor housing from the in-
Governor housing
jection pump housing, insert the tappet holder (157931-2500) first between the tappet
adjusting bolt and nut in the pump housing to disconnect the camshaft and tappet. Then
remove seven bolts fastening the governor housing. Remove the governor housing by
tapping it with a wooden or plastic hammer.
Reassemble:
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Flyweight mounting nut tightening torque: 53.9-63.7 Nm (5.5-6.5 kgf-m)
l
Coat sealant (code No. 977770-01212) on the mating faces of the governor housing and
pump housing.
Point 4
Disassemble-Reassemble:
l
Remove the bottom screw by using a socket wrench handle.
Point 5
Disassemble:
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To separate between the tappet and
the cam, place the cam at the TDC and
insert the special service tool (tappet
holder) into the hole in the tappet.
(Zexel's code No. 157931-2500)
Point 6
Disassemble:
l
When removing the bearing cover,
wrap oil seal protecting tape on the key
groove and thread. Take this action
also at the time of assembly.
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Tap the camshaft from the opposite
side.
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Insert a screwdriver into the gap and
pry for removal.
7-4