Lombardini CHD series - Oil Pump and Filter; Oil pump; Oil pump rotor clearance; Oil pressure adjusting valve

- 61 - Workshop Manual LDW CHD _ cod. 1.5302.345 - 6° ed_rev. 05
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130
128
126 127
131
129
6
Oil pump
Components:
1 Suction port 5 External rotor
2 Delivery port 6 Internal rotor
3 Oil pressure adjusting Valve port 7 Key
4 Gasket
The oil pump is driven by the crankshaft via key 7. Rotor 6 is
locked in the circumferential but not in the axial direction.
This allows the shaft to move axially while rotors 5 and 6 are
prevented from damaging the pump sealing surfaces.
Oil pump capacity = 24.5 litres/min. at a pressure of 4.5÷4.75
bar (engine speed 3000 rpm, oil temperature 38÷42°C).
Oil lter cartridge
Components:
1 Gasket 4 Blade
2 Plate 5 Filtering material
3 Gasket 6 By-pass valve
Specications:
Max. working pressure ................... 7 bar
Max. explosion pressure................. 20 bar
Low temperature limit ..................... -35°C
By-pass valve setting...................... 2.1/2.8 bar
Totallteringsurface....................... 2000 cm2
Degreeofltration .......................... 15 µm
Oil pressure adjusting valve
Components:
1 Valve
2 Spring
3 Gasket
4 Plug
Length of spring A = 45.5 ÷ 46.0 mm.
Blow compressed air into the valve seat and carefully clean all
components; using a caliper measure the length of spring A.
Oil pump rotor clearance
Measure clearance A between the teeth located along the axis
ofthekeywayasshowninthegure129;itsvalueis0.150mm;
worn limit clearance 0.280 mm.
Lubrication system