Piston And Connecting Rod - Kubota D1503-M-DI Workshop Manual

03-M-DI Series, WSM

(3) Piston and Connecting Rod

Oil Clearance of Camshaft Journal
1. Measure the camshaft journal O.D. with an outside micrometer.
2. Measure the cylinder block bore I.D. for camshaft with a cylinder
gauge, and calculate the oil clearance.
3. If the oil clearance exceeds the allowable limit, replace the
camshaft.
Factory spec.
Oil clearance of
camshaft journal
Allowable limit
Camshaft journal O.D. Factory spec.
Cylinder block bore I.D. Factory spec.
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.
Factory spec.
Piston pin bore I.D.
Allowable limit
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.
Factory spec.
Oil clearance between
piston pin and small end
bushing
Allowable limit
Piston pin O.D. Factory spec.
Small end bushing I.D. Factory spec.
S-70
DIESEL ENGINE
0.050 to 0.091 mm
0.0020 to 0.0036 in.
0.15 mm
0.0059 in.
39.934 to 39.950 mm
1.57221 to 1.57284 in.
40.000 to 40.025 mm
1.57480 to 1.57579 in.
W1031662
25.000 to 25.013 mm
0.98425 to 0.98476 in.
25.05 mm
0.9862 in.
W1031817
0.014 to 0.038 mm
0.00055 to 0.00150 in.
0.15 mm
0.0059 in.
25.002 to 25.011 mm
0.98433 to 0.98468 in.
25.025 to 25.040 mm
0.98523 to 0.98582 in.
W1031982
KiSC issued 10, 2009 A