Beta Enduro RR 350 2015 Workshop Manual page 36

2
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.
34
2
1
7
11
2.5 ENGINE LUBRICAtIoN CIR-
CUIt
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 hi-
gher displacement -, passing through the oil filter 8
and sent to the ignition unit compartment A. There
it is sucked once again by the pump 1 after being
filtered through the wire metal filter 11.
The one-way valve 10 controls the pressure betwe-
en the external casing on the ignition unit side and
the crank mechanism compartment.
6
4
3
A
5
9
10
8
B