Kubota WSM F3680 User Manual

1-S46
F2880, F3680, RCK72-F36, RCK72R-F36, RCK60-F36, RCK60R-F36, WSM
ENGINE
(3) Piston and Connecting Rod
Piston Pin Bore I.D.
1. Measure the piston pin bore I.D. in both the horizontal and
vertical directions with a cylinder gauge.
2. If the measurement exceeds the allowable limit, replace the
piston.
W10304770
Oil Clearance between Piston Pin and Small End Bushing
1. Measure the piston pin O.D. where it contacts the bushing with
an outside micrometer.
2. Measure the small end bushing I.D. with an inside micrometer,
and calculate the oil clearance.
3. If the oil clearance exceeds the allowable limit, replace the
bushing. If it still exceeds the allowable limit, replace the piston
pin.
W10305740
Replacing Small End Bushing
(When removing)
1. Press out the used bushing using a small end bushing replacing
tool. (See page “SPECIAL TOOLS”.)
(When installing)
1. Clean a new small end bushing and bore, and apply engine oil to
them.
2. Using a small end bushing replacing tool, press in a new bushing
(service parts) taking care to see that the connecting rod oil hole
matches the bushing hole.
W10307120
Piston pin bore I.D.
Factory spec.
22.000 to 22.013 mm
0.8661 to 0.8667 in.
Allowable limit
22.03 mm
0.8673 in.
Oil clearance between
piston pin and small end
bushing
Factory spec.
0.014 to 0.038 mm
0.00055 to 0.00150 in.
Allowable limit
0.15 mm
0.0059 in.
Piston pin O.D. Factory spec.
22.002 to 22.011 mm
0.8662 to 0.8666 in.
Small end bushing I.D. Factory spec.
22.025 to 22.040 mm
0.8671 to 0.8677 in.
Oil clearance between
piston pin and small end
bushing (Spare parts)
Factory spec.
0.015 to 0.075 mm
0.00059 to 0.00295 in.
Allowable limit
0.15 mm
0.0059 in.
Small end bushing I.D.
(Spare parts)
Factory spec.
22.026 to 22.077 mm
0.7885 to 0.7904 in.
(1) Seam
(2) Oil Hole
(A) When Removing
(B) When Installing
(a) 0.785 rad (45 °)
KiSC issued 04, 2006 A

Kubota WSM F3680 Specifications

General

Brand	Kubota
Model	WSM F3680
Category	Lawn Mower
Language	English