Cylinder Bore Correction - Yanmar 3TNV Series Service Manual

4. Disassembly, Inspection and Reassembly of Engines
(6) Tappet
Mainly check the tappet contact surface with the cam
and push rod. Slight surface defects shall be
corrected with an oilstone.
(a) Tappet stem outside diameter measurement
Model Item
Tappet
hole I.D.
TNV82A 88
Stem O.D. 11.975 11.990
Clearance
Tappet
hole I.D.
4TNV94L 98
Stem O.D. 11.975 11.990
Clearance
Tappet
hole I.D.
4TNV106(T)
Stem O.D. 13.966 13.984
Clearance

4.4.6 Cylinder bore correction

1) Slight uneven worn, flawed, etc. shall be
corrected by honing only. If the cylinder is
unevenly worn partially, flawed or otherwise
damaged and cannot be repaired simply by
honing, rebore the cylinder first and then hone.
See 4.4.5.(1)(c) for the boring dimension.
2) Items to be prepared for honing
Flex-Hone
(see No.8 of 4.1.2 in Chapter 4)
Electric drill
Honing fluid
(50:50 mixture of lube oil and diesel oil)
mm
Standard Limit
12.000 12.025 12.045
11.955
0.010 0.050 0.090
12.000 12.018 12.038
11.955
0.010 0.043 0.083
14.000 14.018 14.038
13.946
0.015 0.052 0.092
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