Kubota L4400, Руководство по ремонту

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1-S56
L4400 , WSM ENGINE
Replacing Connecting Rod Small End Bushing
(When removing)
1. Press out the small end bushing with a connecting rod small end
bushing replacing tool.
(When installing)
1. Clean a new small end bushing and bore, and apply engine oil to
them.
2. Press fit a new bushing, taking due care to see that the
connecting rod hole matches the bushing hole.
W11437590
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.
W11466710
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 the allowable limit, replace the ring as
compression leakage and oil loss or burning will result.
4. If the clearance still exceeds the allowable limit after replacing the
ring, replace the piston.
W11485500
(A) When removing (B) When installing
Piston ring gap
Top ring
Factory
spec. 0.25 to 0.40 mm
0.0098 to 0.0157 in.
Allowable
limit 1.25 mm
0.0492 in.
Second ring
Factory
spec. 0.30 to 0.45 mm
0.0118 to 0.0177 in.
Allowable
limit 1.25 mm
0.0492 in.
Oil ring
Factory
spec. 0.25 to 0.45 mm
0.0098 to 0.0177 in.
Allowable
limit 1.25 mm
0.0492 in.
Clearance between
piston ring and
piston ring groove
Second ring
Factory
spec. 0.093 to 0.128 mm
0.0037 to 0.0050 in.
Allowable
limit 0.20 mm
0.0079 in.
Oil ring
Factory
spec. 0.020 to 0.060 mm
0.0008 to 0.0021 in.
Allowable
limit 0.15 mm
0.0059 in.
KiSC issued 07, 2007 A
Tractor Manuals Scotland - Please Do Not Copy
Tractor Manuals Scotland