Kubota D1803-CR-E4, Workshop Manual

Page: 274 / 309

1. Measure the piston pin O.D. where it contacts the
bushing with an external micrometer.
Piston pin O.D.
Service specifi-
cation 25.004 to 25.011 mm
0.98441 to 0.98468 in.
2. Measure the small end bushing I.D. at the
connecting rod small end with an internal
micrometer or cylinder gauge.
Small end bushing
I.D. Service specifi-
cation 25.025 to 25.040 mm
0.98524 to 0.98582 in.
3. Calculate the oil clearance.
NOTE
• If the clearance more than the service limit,
replace the bushing.
• If it still more than the service limit, replace
the piston pin.
• When replacing the small end bushing,
select the cylinder head gasket thickness to
meet with the top clearance.
Oil clearance be-
tween piston pin
and small end
bushing
Service specifi-
cation 0.014 to 0.036 mm
0.00056 to 0.0014 in.
Service limit
0.15 mm
0.0059 in.
RELATED PAGE
7.26 Replacing small end bushing on page 4-174
4.29 Selecting cylinder head gasket on page 4-111
7.1 Checking cylinder head top clearance on page
4-162
7.26 Replacing small end bushing
Tools required
• Small end bushing replacing tool
Removing small end bushing
1. Press out the used bushing with small end bushing
replacing tool.
(A) Removing direction
Installing small end bushing
1. Clean a new small end bushing and bore.
2. Insert a new bushing onto the tool.
NOTE
Apply engine oil to a new small end bushing
and bore.
(B) Installing direction
3. Press-fit it with a press so that the seam (1) of
bushing position as shown in the figure, until it is
flash with the connecting rod.
4. ENGINE
SERVICING
7. Servicing
4-174
D1803-CR-E4,D1803-CR-TE4,D1803-CR-TIE4,V2403-CR-E4,V2403-CR-TE4,V2403-CR-TE4BG,V2403-CR-TIE4
KiSC issued 12, 2018 A