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Workshop Manual_3 - 4 LD_cod. ED0053025560_
4° ed
_ rev.
03
Disassembly / Reassembly
Rocker arm pin and hole
Dimensions (mm)
A
= 15.032 ÷ 15.050
B
= 14.989 ÷ 15.000
Clearances
(A-B)
= 0.032 ÷ 0.061
(A-B)
= worn limit = 0.120
Valves
1
Valve stem
2
Spring holding disk
3
Spring
4
Cap
5
Cotters
Note:
In order to remove the cotters, put a shim under the valve
head and strongly press, as shown in picture 16.
Injector, projection
The projection of the nozzle ends
A
with respect to the head
surface shall be:
2.5÷3 mm for 3LD 450, 3LD 451/S
3÷3.5 mm for 3LD 510, 3LD 510/S
3.5÷4 mm for 4LD 640, 4LD 705, 4LD 820
Adjust by means of a copper gasket
B
having a thickness of 0.5
mm, 1 mm, 1.5mm .
Head
Do not disassemble while it is hot as to avoid any possible
distortion.
If the head surface is distorted, smooth it by removing up to 0.3
mm thickness.
Always replace the copper gasket, see picture 34 for the choice
of thickness.
Gradually tighten the nuts according to the following order
1
,
3
,
2
,
4
, at 50 Nm for 3LD 450, 3LD 451/S, 3LD 510, 3LD510/S, and
at 80 Nm for 4LD 640, 4LD 705, 4LD 820.
Содержание 3LD 450
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