Technical information

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Workshop Manual_3 - 4 LD_cod. ED0053025560_4° ed_ rev. 03
Lubrication circuit
Oil pump
Make sure that the gear teeth are intact and check that the
clearance between the gear periphery and the pump case does
not exceed 0.15 mm and that the drive shaft can easily turn with
an axial clearance not exceeding 0.15 mm.
Check that the gear lubrication holes 1 and 2 are not clogged.
Tighten the pump case at 30 Nm.
Tighten the pump control gear at 20 Nm.
The oil pumps for 3LD 451/S and 3LD 510/S engines, which
turn anticlockwise (from ywheel position), are different, see
information below.
Oil pressure regulating valve
It is housed in the ywheel side main bearing
For 3LD 450, 3LD 451/S, 3LD 510, 3LD 510/S, see picture 63
1 Support 4Sheet metal
2 Valve 5 Screw
3 Spring
Tighten the support at 25 Nm.
For 4LD 640, 4LD 705, 4LD 820,see picture 64
1 Support 5 Spring
2 Gasket 6 Flange
3 Valve support 7 Plate
4 Ball 8 Screw
Tighten the support at 40 Nm.
Oil lter cartridge
Componens:
1 Gasket 5 Bowl
2 Assembly 6 By-pass valve
3 Antidrainage rubber cap 7 Spring
4 Filter element
Features:
Maximum operating pressure: 7 bars
Maximum operating temperature: -25° + 150°C
Filtering degree: 20 µm
By-pass valve setting: 1÷ 1.4
Total ltering surface: 750 cm
2
Oil pump, difference between clockwise rotation pump and
anticlockwise pump
The difference between the oil pump on clockwise rotation
engines and the anticlockwise one is the suction duct provided
either with the pump case and with the base.
See picture 60 for anticlockwise rotation engines from ywheel
position (3LD 451/S, 3LD 510/S).
A =Intake
B = Delivery
Picture 61, for clockwise rotation engines, seen from the
ywheel side (3LD 450, 3LD 510, 4LD 640, 4LD 705, 4LD 820)
C = Intake
D = Delivery