Jeep UNIVERSAL CJ-2A - Page 88

'Jeep' UNIVERSAL and 'Jeep' DISPATCHER
E
FIG. Ill-CRANKCASE VENTILATION
1-Valve Open
2-Valve Closed
designed to open when excessive pressure develops
in the system, relieving the pressure and returning
the excess oil to the oil pan. The cylinder walls,
piston pins, and tappets are supplied with oil from
spurt holes in the connecting rods. A portion of
the oil is continually passed through an oil filter
which effectively removes any foreign matter. sus-
pended in the oil. A flanged section on the rear of
the crankshaft acts as an oil slinger and, in com-
bination with the rear main bearing upper and
lower oil seal, prevents the leakage of oil from the
rear end of the cylinder block. Leakage of oil from
the front end of the cylinder block is controlled by
the crankshaft oil slinger and the front oil seal
installed in the timing gear cover. The oil pressure
indicator light in the instrument panel and the oil
level
gauge or dip stick in the side of the engine
provide a means for checking the oil pressure and
oil level.
Note: As much as 4000 miles [6,400 km.J may be
required for the chrome flash type compression
rings
to seat properly. During this piston ring
run-in period, oil consumption may be higher
than it was before new rings were installed. Oil
consumption that is normal for the driving habits
and type of operation involved should be evident
at 4000 miles.
E-111. Positive Crankcase Ve11tilation
The crankcase ventilating system provides thor-
ough, positive ventilation which reduces to a
minimum the formation of sludge. The crankcase
is ventilated by a sealed system. The system is
actuated through a valve attached to the valve
cover, which is connected by a tube to the intake
manifold. Clean air is drawn into the oil filler tube
through a hose from the air cleaner. Any vapors
in the crankcase are carried into the manifold and
burned.
Be sure there are no air leaks at the tube connec-
tions between the air cleaner and the oil filler tube,
and that the oil filler tube cap gasket is in good
condition. Always keep .the cap locked securely in
place. When tuning the engine or grinding valves,
remove the control valve and clean it thoroughly.
If the valve is blocked with carbon, the ventilating
system will not operate and, shoul<l,i.'$~: :v~lve
fail to seat, it will be impossible to mal(e the engine
idle satisfactorily.
E-112. Oil Filter
The engine is equipped with a replaceable element
type oil filter. This oil filter must be serviced
periodically as outlined in the Lubrication Section.
To replace the filter element remove the cover,
lift out ·the old element, and install a new filter
and gasket. The filter assembly may be replaced
by detaching the oillinesatthe case and removing
the mounting bracket.
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