Komatsu SAA6D140E-3 User Manual

11-34
140-3 SERIES
STRUCTURE AND FUNCTION, MAINTENANCE STANDARD CONNECTING ROD
CONNECTING ROD
★ The connectiong rod cap bolt can be re-used up to a maximum of 5 times. Each time the bolt is re-used,
make a punch mark on the bolt head.
Unit: mm
No. Check item Criteria Remedy
1
Inside diameter of bushing at
connecting rod small end
(Treat with reamer after press
fitting bushing)
Standard size Tolerance Repair limit
Replace
bushing
(New part is
supplied as a
semi-finished
part)
52
+0.049
+0.030
52.09
Clearance between bushing at
connecting rod small end and
piston pin
Standard clearance Clearance limit Replace
bushing or
piston pin
0.030 – 0.055 0.11
2
Inside diameter of bushing
hole at connecting rod small
end
Standard size Tolerance
Replace
connecting
rod
57.4
+0.030
0
3
Inside diameter of bearing at
connecting rod big end
Standard size Tolerance Repair limit
Replace
bearing
90
+0.042
–0.008
90.15
4
Inside diameter of bearing
hole at connecting rod big end
(Measure after tightening
connecting rod cap bolt with
specified torque)
95
+0.026
–0.004
—
Replace
connecting
rod
Thickness of connecting rod
bearing
2.5
+0.002
–0.008
—
Replace
bearing
5
Parallelism and twist of
connecting rod
Item
Stan-
dard
size
Repair
limit
Replace
connecting
rod
Paral-
lelism a
0.20 0.25
Twist b 0.30 0.35
Dimen-
sion c
264 —
6
Tightening torque of
connecting rod cap mounting
bolt (Coat bolt threads and nut
seats with engine oil)
Standard size Target (Nm{kgm}) Range (Nm{kgm})
Retighten
1st step 127.5 {13}
117.7 – 132.4
{12.5 – 13.5}
2nd step Retighten with 90º
90
— Weight of connecting rod
Permissible range:
Variation between weights on the machine max. 154g
Replace
+30º
+00º

Komatsu SAA6D140E-3 Specifications

General

Brand	Komatsu
Model	SAA6D140E-3
Category	Engine
Language	English