Cylinder Bore Correction - Komatsu 4D98 Series Shop Manual

4. Engine Body
(5.6)
Tappet
Mainly check the tappet contact surface
with the cam and push rod. Slight sur-
face defects shall be corrected with an
oilstone.
0
Tappet stem outside diameter mea-
surement
Standard
I I
Limit
4TNE94.98
I
1 Tappet hole I.D. 1 12.000-12.018 ( 12.038
1
/ Tappet hole I.D. 1 14.000-14.018 / 14.038
1
Tappet
Abnormal contact Normal contact
surface surface
Stem O.D.
Clearance
13.966-l 3.984
13.946
0.015-0.052 0.092
Tappet stem outside diameter measurement
(6) Cylinder bore correction
Flex-Hone
Slight uneven worn, flawed, etc. shall
be corrected by honing only. If the cyl-
inder is unevenly worn partially, flawed
or otherwise damaged and cannot be
repaired simply by honing, rebore the
cylinder first and then hone. See (5)
(5.1)@ for the boring dimension.
Items to be prepared for honing
Flex-Hone
Flex-hone
Lube oil
6
Honing fluid
Diesel oil
(see 11.1-8 in Chapter 11)
Electric drill
Honing fluid
(50:50 mixture of lube oil and diesel oil)
Items to be prepared for honing
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