Crankshaft - Kubota V3300-E2B Workshop Manual

V3300-E2B, V3300-T-E2B, WSM

(4) Crankshaft

Clearance between Piston Ring and Groove
1. Remove carbon from the ring grooves.
2. Measure the clearance between the ring and the groove with a
feeler gauge or depth gauge.
3. If the clearance exceeds allowable limit, replace the ring since
compression leak and oil shortage result.
4. If the clearance still exceeds the allowable limit after replacing the
ring, replace the piston.
Second ring
Factory spec.
Oil ring
Second ring
Allowable limit
Oil ring
Factory specification : a
(A) Top Ring (Key Stone Type)
Crankshaft Side Clearance
1. Set a dial indicator with its tip on the end of the crankshaft.
2. Measure the side clearance by moving the crankshaft to the front
and rear.
3. If the measurement exceeds the allowable limit, replace the
thrust bearings.
4. If the same size bearing is useless because of the crankshaft
journal wear, replace it with an oversize one referring to the table
and figure.
Factory spec.
Crankshaft side
clearance
Allowable limit
(Reference)
• Oversize dimensions of crankshaft journal.
0.2 mm
Oversize
0.008 in.
169.1 to 169.15 mm
Dimension A
6.6575 to 6.6594 in.
29.20 to 29.25 mm
Dimension B
1.1496 to 1.1515 in.
2.8 to 3.2 mm radius
Dimension C
0.1102 to 0.1260 in. radius
The crankshaft journal must be fine-finished to higher than ∇∇∇∇.
S-68
DIESEL ENGINE
0.093 to 0.120 mm
0.0037 to 0.0047 in.
0.020 to 0.060 mm
0.0008 to 0.0023 in.
0.20 mm
0.0079 in.
0.15 mm
0.0059 in.
More than 0.2 mm
0.079 in.
(B) 2nd, Oil Ring
W1066183
0.15 to 0.31 mm
0.0059 to 0.0122 in.
0.50 mm
0.0197 in.
0.4 mm
0.016 in.
169.2 to 169.25 mm
6.6614 to 6.6634 in.
29.40 to 29.45 mm
1.1574 to 1.1594 in.
2.8 to 3.2 mm radius
0.1102 to 0.1260 in. radius
(0.8S)
W1066738
KiSC issued 06, 2006 A