DATE
30-11-2001
TECO/ATL AUTHOR
BOOK CODE
1-5302-556
MODEL No.
50839
DATE OF ISSUE
01-94
REVIEW 02
APPROVAL
13
Clearance volume
A = Clearance volume
B = Head gasket
The thickness B head gasket determines the clearance volume A
which shall be 0.75 ÷ 0.90 mm for 3LD 450, 3LD 451/S, 3LD 510,
3LD 510/S and 0.80 ÷ 1.00 mm for 4LD 640, 4LD 705, 4LD 820.
Measure the piston crown position as to the cylinder surface and
chose a gasket having a suitable thickness.
Always consider that the piston at the top dead centre could be at the
same level, either under or over the cylinder.
Connecting rod equipped with bearings and piston pin
For 3LD 450, 3LD 451/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 = 27.995 ÷ 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
451/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.
38
34
35
39
37
36
DISASSEMBLY/REASSEMBLY
V
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