Workshop Manual

EPA07/10 DD PLATFORM WORKSHOP MANUAL - ENGINE

22.1 DESCRIPTION AND OPERATION OF CRANKCASE BREATHER

The crankcase breather is located below the turbocharger on DD Platform engines, next to the

starter on the right hand side of the cylinder block. The crankcase breather has the primary task of

regulating the pressure in the crankcase as well as cleaning discharged blow-by gases. The gases

from the crankcase contain engine oil that can lead to adverse effects on engine emission levels.

The blow-by gas produced by the engine passes into the blow-by gas inlet in t he crankcase

breather housing. In the housing, the blow-by gas ﬂows to the centrifuge. The centrifuge drive

gear is driven by pressurized engine oil, causing the centrifuge to turn. The centrifugal force

that is created causes the blow-by gas to be pushed against the inside wall of the housing. The

engine oil contained in the blow-by gas runs along the inside wall downwards and ﬂows to the

outlet for the e ngine oil t hat has been separated back into the oil pan. The cleaned blow-by gas

ﬂows to the outlet for blow-by gas to the atmosphere. The crankcase breather is m aintenance

free for the working life of the component.

1. Bolt 7. Inlet Tube

2. Gasket 8. Bolt

3. Outlet Tube 9. Bolt

4. Bol t

10. Se al

5. Gasket

11. Crankcase Breather

6. Gasket

Figure 2 2-1 EPA07 Crankcase Breather and Related Parts

All information subject to change without notice.