Engine Lubrication: Description and Operation

NOTE:
^ Revised components should only be installed on this engine.
^ The later lubrication system with revised oil circulation can be identified by the missing oil pressure relief valve plug on the oil pump.

1 Oil filter
- Larger outer dimension
- NOT interchangeable with older version
2 Oil cooler
- Larger cross-sectional flow area
3 Cover for oil pan
- New
4 Pressure relief valve
- New
5 Oil supply to engine
6 Oil pump
- New
7 Pressure relief valve 11 bar 1160 psi)
- New
8 Oil pick-up
9 Oil pressure switch 1.8 bar (26 psi)
- Color: Brown

FUNCTIONAL DESCRIPTION





Intake Side
Oil is taken in from the oil pump -6 via the oil pick-up -8-.

Pressure Side
Oil pressure comes from the oil pump -6- past the upper part of the oil pan to the 11 bar (160 psi) pressure relief valve -7-, the oil pressure switch -9-, the oil cooler -2- and the oil filter -1- to the pressure relief valve -4-.
Pressure relief valve -4- controls the oil pressure to the engine.
The 11 bar (160 psi) pressure relief valve -7- is a safety valve that opens only at high RPM and cold engine temperature.

Advantages
Oil pressure is controlled from the oil filter and oil cooler, so that the oil pressure available at those locations is supplied via the pressure relief valve -4- or from the oil pump.

Oil Pump
Oil circulation has been changed so that the oil pressure relief valve in the oil pump is on the "clean oil" side.
The following components have been changed:
- Oil filter
- Attachment flange for oil filter
- Cover plate





Oil circulation within pump:
- Old oil circulation is from the pressure side -F- to the oil filter and at the same time, via bore -A-, through channel -C- to the pressure relief valve -D-.
- New oil circulation is from the pressure side -F-, via the pressure relief valve in the oil pan, through the oil cooler and the oil filter, back to the oil pump -G- to recess -H- and, at the same time, via channel -B-to bearing positions, and via channel -C- to the pressure relief valve -D-.