Maintenance; Engine Tune-Up; Adjusting Valve Lash; Checking Valve Timing - Jeep CJ-5 Owner's Manual

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MAINTAINING YOUR :FED VEHICLE
POWER PIANT
PERIODIC INSPECTION
CHECKING
VALVE TIMING
ProDer maintenance of
You.
'Jeep'-vehicle demands that it be
qiven a thorough
service inspec
tion and lubrication at €ach 1000
miles I1.600 km.l of operation
Such an inspection consists of a
careful road test and examiDation
by a competent se.vice technician
to locate and analyze any small
faults that
may have developed
Prompt correction of minor faults
thus discovered will go far toward
holdins down maintenaoce expense
and costly delays in operation.
Your
'Jeep' vehicle dealer is
vitally
interested in your 'Jeep'
vehicle and it will pay you to have
him
regularly insp€ct it. Many
dealers' s€rvice technicians have
the advantage of complete factory
specifications cove.ins the v€hicle
as well
as bulletins which are
regularly sent out by the factory.
The follo\rins paragraphs outline
methods of making minor adjust
ments and also suggest P.ev€ntive
maintenance ope.ations.
Should
major rcpai. work be n€cessary,
consult you. 'Jeep' vehicle dealer.
The
valve timins
may be
checked in the following manner:
Adjust the inlet valve lash of No.
1 cylinde. to .026' (.6604 mm.).
Then rotate the craDkshaft clock-
wise until the piston in No. 1 cylin-
der is ready for the intale
stroke.
To dete.min€
this,
estimate the
9o befo.e top center position on the
timing gear cover. figure 8, by
notins the distance between the
top center ma.k and th€ 5' mark,
and aligD the notch
oD the fan
drive pulley with the 9o position.
With the crankshaft in this posi-
tioD, valve tiDidg
is correct if No.
I rocker arm is just tight against
the end of the valve stem.
After checking, reset the valve
lash to the cor.ect clearance.
Should the timing be incor.ect,
it is advisable to consult you.
'Jeep' vehicle dealer.
FIG. 8 {IL PUMP
r? R.ri.f v,lvc Prunia!
PUMP
20 pounds (1.4 kg./sq. cn.) at 3s
mph. (56 km./h.) and 6 pounds
(.a3 ke./sq. cm.) at the idte speed
of 600 rpm.
The oil pump drive shaft drives
ENGINE TUNE-UP
For best performance and de-
p€ndability, the engine should havc
a tune-up twice yearly, preferably
in the sp.ins and fall.
Proper tune-up proceduie should
include the following:
. Clean and tight€n the battery
cable terminals, the battery ground
connection and sround strap on the
right side of tlle
engine at the
front eDgine support.
. Remove th€ spark plugs, clean
them thoroughly and sPace the
electrqles to .030/ 10,76 mm l gap.
. Check valwe
clearance
See
Remove t}te distdbutor
caP
and inspcct the contact Points.
A djus t i he p oi nts to.02 0"
10, 51
mm.l sap.
. check tne isnition timing. See
ADJUSTING
The tash on €xhaust valves
should be set at 016" (.406 mm),
intake valves at .018' ( 46 rnm.).
Us€ care in makins this adjustment
that the measu.enents a.e accurate
by usins feele. sauges and making
sure that the taPPets are restng
against the lowest surface of the
"Electrical Section."
. Clean the
fuel pump filt€.
screen and check the fuel line con
. Remove and clean the venti
. Sta.t tne engine and allow it
to run until thoroughly waim, tnen
s€t tlle throttle adjustins screw,
so the engine will idle at 600 rpft.
. Adjust the carburetot low spced
idle screw so that the ensine will
idle smootlly.
Should the engine fail to perform
satisfactorily and the tlouble is
definitely t.aced to the carburetor,
consult your 'Jeep' vehicle dealer'
Carburetor service is specialized
and should not be undertaken un
less the unit is thoroughly under'
VALVE LASH
OIL
The oil pump is plovided with
a Pressure relief valve which con
trcls the oaximum oil plessu.e at
The minimum safe pr€ssure is
FIG. ?_TIMING
MARKS