Kubota WSM User Manual

1-S67
ZD18(F) · ZD21(F) · ZD28(F), WSM
ENGINE
Correcting Cylinder
1. When the cylinder is worn beyond the allowable limit, bore and
hone it to the specified dimension.
[D722 · D782]
[D1105]
2. Replace the piston and piston rings with oversize ones.
[D722 · D782]
[D1105]
NOTE
• When the oversize cylinder is worn beyond the allowable
limit, replace the cylinder block with a new one.
W10367470
Oversized cylinder liner
I.D.
Factory spec.
67.250 to 67.269 mm
2.64764 to 2.64839 in.
Allowable limit
67.419 mm
2.65429 in.
Finishing
Hone to 1.2 to 2.0 μ R max.
∇∇∇
(0.0472 to 0.0787 in. R max.)
Oversized cylinder liner
I.D.
Factory spec.
78.500 to 78.519 mm
3.0906 to 3.0913 in.
Allowable limit
78.65 mm
3.0965 in.
Finishing
Hone to 1.2 to 2.0 μ R max.
∇∇∇
(0.0472 to 0.0787 in. R max.)
Oversize Part Name Code Number Marking
0.25 mm
0.0098 in.
Piston 16851-21900 025 OS
Piston ring assembly 16851-21090 025 OS
Oversize Part Name Code Number Marking
0.5 mm
0.0197 in.
Piston 05 16060-21910 05 OS
Piston ring 05 assembly 16261-21090 05 OS
(1) Cylinder I.D. (Before Correction) (2) Oversized Cylinder I.D.
KiSC issued 04, 2009 A

Kubota WSM Specifications

General

Brand	Kubota
Model	WSM
Category	Lawn Mower
Language	English