UAZ PICKUP - Engine Housing Ventilation System

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Then drain the ushing oil, replace the oil lter and pour in clean
engine oil. If the ushing oil is absent, the ushing can be carried
out using pure engine oil.
Engine crankcase ventilation system
During engine breather system maintenance remove valve cap
4 (Fig. 9.4), ventilation hoses and tubes, vacuum valve cap 3, the
valve membrane and spring and clean the removed parts. Clean
the holes of valve cap ventilation necks, holes 7 of separated oil
drain, sensing hole 8 in the vacuum valve case and venting holes
in the vacuum valve cap. The oil bafe 5 shall be ushed mounted
on the valve cap. Check the membrane for damage and breakage.
When re-assembling, ensure tightness of connections.
ATTENTION! The engine may not be operated if the crankcase
ventilation system is not tightly sealed and with opened oil ller.
This results in an increased escape of oil with crankcase gases,
and contamination of the environment. To prevent the crankcase
ventilation system from de-pressurization, you must close the oil
ller cap tightly, as far as it can go, and install the oil level indi-
cator against stop.
Fig. 9.4. Engine crankcase of ventilation:
1 — receiver; 2 — ventilation tube connects depression valve to receiver; 3 — depression
valve; 4 — valve cap; 5 — oil reector; 6 — blow-by gas ow; 7 — blow-by gas
separated oil drain orice; 8 — depression valve orice; 9 — engine injection system
air supply tube with reverse valve.