Nanni 5.280HE Workshop Manual page 97

03-M Series, WSM
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.
Replacing Connecting Rod Small End Bushing
(When removing)
1. Press out the used small end 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
taking due care to see that the connecting rod oil hole matches
the bushing hole.
(A) When removing
Piston Ring Gap
1. Insert the piston ring into the lower part of the liner (the least worn
out part) with the piston.
2. Measure the ring gap with a feeler gauge.
3. If the gap exceeds the allowable limit, replace the ring.
Factory
spec.
Top ring
Allowable limit
Factory spec.
Second ring
Allowable limit
Factory spec.
Oil ring
Allowable limit
S-80
DIESEL ENGINE
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 0.98469 in.
25.025 to 25.040 mm
0.98524 to 0.98583 in.
W1031982
(B) When installing
W1032140
0.20 to 0.35 mm
D1503-M
0.0079 to 0.0138 in.
D1703-M
D1803-M 0.20 to 0.40 mm
V2203-M 0.0079 to 0.0157 in.
V2403-M
1.25 mm
0.0492 in.
0.30 to 0.45 mm
0.0118 to 0.0177 in.
1.25 mm
0.0492 in.
0.25 to 0.45 mm
0.0098 to 0.0177 in.
1.25 mm
0.0492 in.
W1032246
KiSC issued 08, 2012 A