Crankshaft - Kubota WSM L3560 Workshop Manual

L3560, L4060, L4760, L5060, L5460, L6060, WSM

[4] CRANKSHAFT

Clearance between Piston Ring and Groove
1. Clean the rings and the ring grooves, and install each ring in its
groove.
2. Measure the clearance between the ring and the groove with a
feeler gauge or depth gauge.
3. If the clearance is more than the allowable limit, replace the
piston ring.
4. If the clearance stays more than the allowable limit with new
ring, replace the piston also.
Factory
specifica-
tion
Top ring
Allowable
limit
* D1803-CR-TE4 and V2403-CR-TE4 are key stone type.
Factory
specifica-
tion
Second ring
Allowable limit
Factory
specifica-
tion
Oil ring
Allowable limit
Side Clearance of Crankshaft
1. Set a dial indicator with its point on the end of the crankshaft.
2. Move the crankshaft to the front and rear to measure the side
clearance.
3. If the measurement is more than the allowable limit, replace the
thrust bearings.
4. If the same dimension bearing is not applicable because of the
crankshaft journal wear, replace it with an oversize one. Refer
to the table and figure.
Factory specification
Side clearance of
crankshaft
Allowable limit
(Reference)
• Oversize dimensions of crankshaft journal
0.2 mm
Oversize
0.008 in.
54.50 to 54.70 mm
Dimension A
2.146 to 2.153 in.
26.20 to 26.25 mm
Dimension B
1.032 to 1.033 in.
2.8 to 3.2 mm radius
Dimension C
0.11 to 0.12 in. radius
The crankshaft journal must be fine-finished to higher than Rmax = 0.4S
1-S87
D1803-CR-E4, 0.050 to 0.090 mm
V2403-CR-E4 0.0020 to 0.0035 in.
D1803-CR-E4, 0.20 mm
V2403-CR-E4 0.0079 in.
0.0930 to 0.128 mm
V2403-CR-TE4
0.00367 to 0.00503 in.
D1803-CR-E4 0.0780 to 0.110 mm
V2403-CR-E4 0.00307 to 0.00433 in.
0.20 mm
0.0079 in.
0.020 to 0.060 mm
V2403-CR-TE4
0.00079 to 0.0023 in.
D1803-CR-E4 0.030 to 0.070 mm
V2403-CR-E4 0.0012 to 0.0027 in.
0.15 mm
0.0059 in.
9Y1210824ENS0095US0
0.15 to 0.31 mm
0.0059 to 0.012 in.
0.5 mm
0.02 in.
0.4 mm
0.02 in.
54.60 to 54.80 mm
2.150 to 2.157 in.
26.40 to 26.45 mm
1.040 to 1.041 in.
2.8 to 3.2 mm radius
0.11 to 0.12 in. radius
9Y1210824ENS0096US0
KiSC issued 03, 2016 A
ENGINE