30
REG. CODE
1-5302-596
MODEL N°
50881
DATE OF ISSUE
15-05-2003
REVISION
00
DATE
15-05-2003
ENDORSED
COMPILER TECO/ATI
IX
91
LUBRICATION SYSTEM DESCRIPTION
The oil contained in the engine sump is deaerated through the labyrinth (
1
) and filtered by the filter (
2
) before it is sucked by
the pump (
3
) through the suction duct (
4
).
From the pump the oil is pushed towards a circuit machined in the cylinder head in proximity to particular points to be cooled
(
5
).
The cooling circuit internal pressure is limited by the by-pass valve (
7
). The by-pass valve is necessary because, with the engine
cold and therefore with high oil viscosity the oil pressure wouldbecome too high. The diaphragm (
6
) regulates the oil quantity
for the camshaft lubrication.
A by-pass valve (
8
) regulate the lubrication pressure at a predetermined value. Before being sent to the cylinder head (
5
),
to camshaft support (
9
) and to the journal bearings (
10
) the oil is filtered through a total flow filter cartridge (
11
). In case of
obstruction of the filter an internal by-pass valve (
12
) opens up.
Nearby on the clutch side crankshaft support, a nozzle with a closing valve is fixed. These nozzle valve is preset and has the
function of cooling the piston through its oil jet and to lubricate the connecting rod small end bearing and the piston pin.
The oil that comes out from the cylinder head and camshaft carrier compartment is returned into the crankcase through an
appropriate pipe that is not represented in the figure.
7-
Characteristics of the spring located in the oil pressure regulating valve for lubrication and cooling circuits
- By-pass spring free length —> 33 mm
- Load exerted by the above mentioned spring at a length of: 27.5 mm —> 3.1 ± 0.15 Kg
8-
Lubrication by-pass
- Spring free length —> mm 48
- Load exerted by the above mentioned spring at a length of: 36 mm —> 3.4 ± 0.10 Kg
29 mm —> 5.3 ± 0.13 Kg
DISASSEMBLY/REASSEMBLY
Содержание LDA 422
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