3-3204/14/2009NP10-V8JLR: AJ133 5.0-Liter DFI V8 EngineTechnical Training
Crankcase Ventilation System Engine Management System
CRANKCASE VENTILATION SYSTEM
During a normal compression stroke, small amounts of
gases in the combustion chamber escape past the piston.
Approximately 70% of these gases are unburned fuel
(Hydrocarbons).
The purpose of a Positive Crankcase Ventilation (PCV)
system is to prevent crankcase pressure build-up, protect
engine seals, and remove harmful gases from the crank-
case and combine them with the engine’s normal incom-
ing air/fuel charge. The crankcase is ventilated through part-load and full-
load breathers and oil separators, which consist of a vari-
able geometry oil separator, pressure control valves, and
oil drain valve. This sophisticated system reduces oil
pullover by over half.
The integrated twin PCV valves prevent the hose from
icing and improve driveability in cold climates. The full
load breather hose purges the crankcase and reduces
condensation when the engine is cold.
NA Crankcase Ventilation System
TWIN
POS ITIVE CRANKCAS E VENTILATION VALVES
PART LOAD BREATHER TUBE FULL LOAD BREATHER TUBE
NP10V8112
