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Workshop Manual__3 - 4 LD_cod. ED0053025560_
4° ed
_ rev.
03
Disassembly / Reassembly
Connecting rod equipped with bearings and piston pin
For 3LD 450, 3LD 450/S, 3LD 510, 3LD 510/S
Dimensions (mm)
A
= 144.05 ÷ 145.05
B
= 23.02 ÷ 23.03 (with driven and machined
bearing)
C
= 42.028 ÷ 42.052 (with bearing tightening at 3 Nm)
D
= 22.995 ÷ 23.000
For 4LD 640, 4LD 705, 4LD 820
Dimensions (mm)
A
= 162.95 ÷ 163.05
B
= 28.02 ÷ 28.03
C
= 55.40 ÷ 55.43
D
= 27.995 ÷ 28.000
The connecting rod big end bearings are supplied either at
nominal value and diminished to 0.25 and 0.50 mm.
Connecting rod, big end bearings
While reassembling, the A and B centering marks should not be
on the same side.
Tighten the screws at 30 Nm for 3LD 450, 3LD 451/S, 3LD 510,
3LD 510/S and at 45 Nm for 4LD 640, 4LD 705, 4LD 820.
Main bearing on flywheel side
Extract the bearing using three screws, as per picture 38.
While reassembling, replace gasket
1
. Check that the oil seal
ring is intact. Tighten the screws at 25 Nm.
Drive shaft axial clearance
After having screwed the main bearing on the flywheel, check
drive shaft axial clearance. Its value is 0.10 ÷ 0.40 mm for 3LD
450, 3LD 450/S, 3LD 510, 3LD 510/S and 0.10 ÷ 0.30 mm for
4LD 640, 4LD 705, 4Ld 820.
The adjustment is carried out by changing the gasket
1
thickness.
Содержание 3LD 450
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