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LUBRICATION AND MAINTENANCE
Fig. 7 Crankcase Ventilation System Operation
(Typical)
FREQUENCY
OF
SERVICE
The crankcase v e n t i l a t i o n system m u s t be k e p t
clean t o m a i n t a i n good engine performance a n d d u -
r a b i l i t y .
Periodic service is required to remove combustion
products f r o m t h e valve, hoses a n d i n t a k e m a n i f o l d
passages. T h e components should be inspected a n d
serviced as indicated a t t h e mileage or t i m e i n t e r v a l
specified i n t h e appropriate L u b r i c a t i o n and M a i n t e -
nance C h a r t . I f a vehicle is used extensively for short
trips w i t h frequent i d l i n g , t h e crankcase v e n t i l a t i o n
system m a y require servicing more frequently.
INSPECTION
AND SERVICE
PROCEDURE
(1) W i t h engine i d l i n g :
(a) Remove P C V valve. I f t h e valve is n o t
plugged, a h i s s i n g noise w i l l be heard as a i r passes
t h r o u g h t h e valve, and a strong vacuum should be
felt w h e n a finger is placed over t h e valve i n l e t
(Fig. 8).
(b) I n s t a l l t h e P C V valve. Remove t h e crank-
case i n l e t tube f r o m t h e a i r cleaner assembly a n d
loosely h o l d a piece of paper over t h e open end o f
the tube. A f t e r a l l o w i n g about a m i n u t e for t h e
crankcase pressure to reduce, t h e paper should be
sucked against t h e opening w i t h
a noticeable
amount o f force.
(2) W i t h engine stopped; remove P C V valve a n d
shake. A c l i c k i n g noise should be heard t o indicate
t h a t t h e valve mechanism is free.
(3) I f t h e crankcase v e n t i l a t i o n system meets t h e
tests i n (1) a n d (2) above, no f u r t h e r service is re-
quired. I f not, t h e P C V valve should be replaced a n d
the system checked again. I n s t a l l a new Mopar P C V
Valve, o r equivalent. D o not a t t e m p t to c l e a n t h e
o l d P C V v a l v e !
(4) I f test ( l b ) fails when a n e w P C V valve has
been i n s t a l l e d , i t w i l l be necessary to replace t h e
PCV hose a n d clean t h e P C V hose intake port.
•
Fig. 8 Check Vacuum at PCV Valve
(5) C l e a n t h e crankcase i n l e t a i r filter.
(6) Clean or replace t h e engine a i r cleaner.
CRANKCASE INLET AIR FILTER
Clean a n d lubricate t h e crankcase i n l e t a i r cleaner
a t t h e mileage or t i m e i n t e r v a l shown i n t h e L u b r i -
cation a n d Maintenance Schedule.
(1) Disconnect t h e hoses f r o m t h e crankcase i n l e t
a i r filter ( F i g . 9).
(2) Remove t h e crankcase i n l e t a i r filter a n d w a s h
i t t h o r o u g h l y i n kerosene or s i m i l a r solvent.
(3) L u b r i c a t e or w e t t h e filter, by i n v e r t i n g t h e
crankcase i n l e t a i r filter a n d filling w i t h S A E 30 en-
gine o i l . Position t h e a i r filter t o allow excess o i l t o
d r a i n t h o r o u g h l y t h r o u g h t h e vent nipple located o n
t h e top o f t h e a i r filter.
M o r e frequent service m a y be required for vehicles
used i n short r u n , stop a n d go or extended engine
idle service.
J9000-52
Fig. 9 Crankcase Inlet Air Filter
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