SHOP MANUAL
Engine
Ch 1 page 146
The pistons are cooled by the lubrication oil.
Oil is sprayed up under the piston crown through
special nozzles, one for each cylinder.
Since piston cooling is not needed at low engine
rpm, an oil pressure valve in the oil cooler hous-
ing opens at 3 bar.
See the next page.
Max. oil pressure:
Warm engine running at a speed above 800 rpm 6 bar
Normal oil pressure:
Warm engine running at an operating speed of 3 - 6 bar
Min. oil pressure:
warm engine running at a speed of 1000 rpm 1.0 bar
The control system has the following alarm levels:
- at a speed of less than 1000 rpm and an oil pressure of less than 1.0 bar
- at a speed of more than 1000 rpm and an oil pressure of less than 2.3 bar
for longer than 5 seconds.
The following functions are available if there is an alarm:
- Alarm which only switches on the warning lamp and diagnostics lamp.
A fault code is generated in the control unit.
After an alarm, approved values should be registered for more than 1
second to reset the alarm.
Oil pressure
High lubricating oil pressure (above
6 bar) is normal when starting a
cold engine.
Figure 291
NOTE
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