2
33
engi
n
e dis
a
s
sem
bl
y
6
5
3
9
8
1
11
2
4
7
A
B
10
2.5 ENGINE LUBRICAtIoN
CIRCUIt
The high-pressure pump (or delivery)
1
- with less
displacement - sends the oil purified by the paper
filter
2
, to the crank mechanism
3
, to the piston
oil jets
4
, to the tensioner
5
and to the cylinder
head jets and camshafts*
6
. The valve
7
controls
the pressure.
When oil has lubricated the cylinder head and
has seeped through the tensioner, it flows along
the timing chain to the ignition unit compartment
A
. When oil has lubricated the crank mechanism
and the piston-cylinder coupling, it goes to the
crank mechanism compartment
B
from which it
is sucked by a low-pressure pump (or recovery)
9
- with higher displacement -, passing through
the oil filter
8
and sent to the ignition unit com
-
partment
A
. There it is sucked once again by the
pump
1
after being filtered through the wire me
-
tal filter
11
.
The one-way valve
10
controls the pressure
between the external casing on the ignition unit
side and the crank mechanism compartment.
ENGINE LUBRICATION CIRCUIT:
1) High-pressure pump;
2) Paper oil filter;
3) Crank mechanism;
4) Piston oil jets;
5) Hydraulic tensioner;
6) Cylinder head oil jets;
7) High-pressure valve;
8) Internal filter;
9) Low-pressure pump;
10) By-pass valve;
11) Wire metal filter;
A) Ignition unit compartment;
B) Crank mechanism compartment.
* Part of the lubricant sent to the cylinder head is used for the hydrodynamic support of the camshafts.
