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9-6
ENGINES--6CYLINDER
PART 2
SIX CYLINDER ENGINES
SERVICE PROCEDURES
TUNE-UP
(1) Test the battery specific gravity, add water
if
necessary, clean and tighten the battery connections.
(2)
Test the cranking voltage if below 9.6 volts and
more than 130.amperes draw. See "Starting Motor
Cranking Voltage" Electrical Group 8.
(3) Tighten the intake manifold bolts to 15 foot-
pounds torque.
(4) Perform the cylinder compression
test.
The
compression should not vary more than 20 pounds
for any one engine.
(5) Clean or replace spark plugs as necessary and
adjust gap to .035 inch. Tighten to 30 foot-pounds
torque.
(6)
Test the resistance of the spark plug cables
and if the resistance is more than 30,000 ohms for any
cable, replace the cable.
(7) Remove the distributor. Clean the cap and ro-
tor using
a
non-flammable detergent. Inspect for car-
bon tracking, cracks and corrosion. Inspect the break-
er plate, contacts, lead wire and vacuum advance, re-
place if necessary. Adjust to specifications. Test coil
and condenser.
(8) Install the distributor, distributor cap, and
spark plug cables. Reset the ignition timing with the
vacuum advance line disconnected. The ignition tim-
ing should be
set to compensate for altitudes and/or
gasoline grades as follows:
A. At low altitudes, with any good grade of the
recommended gasoline, either "regular" or "premi-
um," the engine will give its best performance if
timed according to specifications.
B.
When using lower grade fuels, or after carbon
has accumulated, objectionable spark ping may occur
with the specified timing. In cases of this nature, ig-
nition timing should be retarded, but not to exceed
5 degrees of crankshaft rotation later than specified.
C. At high altitudes or when using higher quality
gasoline, for example "premium" where "regular" is
specified or "super premium" where premium is spec-
ified, there is less tendency for spark ping. In such
cases, improved performance may be obtained by ad-
vancing the spark not to exceed
5
degrees of crank-
shaft rotation ahead of specified timing.
NOTE: It is
recommended, however, that vehicles
operating at high speeds or hauling trailers have
ignition timing set at not over the specified setting.
D. Within the foregoing limits, namely, from
5
de-
grees
ahead to
5
degrees later than specified timing,
Fig. 3 - C l e a n i n g Filter Element
a
good rule to follow is to advance the spark until a
slight ping is heard when accelerating from 15 mph
in direct drive at wide open throttle.
(9) Set carburetor idle mixture adjustment. Adjust
the throttle stop screw to specifications. Perform a
combustion analysis.
(10) Test the fuel pump for pressure and vacuum.
Refer to "Fuel System" Group 14, Specifications.
(11) Inspect the manifold heat control valve
in the
exhaust manifold for proper operation and apply
Manifold Heat Control Valve Solvent Part Number
1879318 to the bushing and shaft.
(12) Every 6 months remove the filter element and
blow out dirt gently with an air hose. Direct air from
inside out, and keep nozzle
2
inches away from the
element to avoid damaging. Clean the metal housing
and install the element. Every two years, install a
new factory recommended MoPar filter element. Serv-
ice the unit more frequently when driving under
se-
vere conditions, such as in dusty areas. Fig. 3.
(13)
Inspect and adjust the accessory belt drives
referring to Cooling Sydem, Group 7 for proper ad-
justments.
(14) Road
test
the vehicle as a final
test.
ENGINE REPLACEMENT
Removal
remove the hood.
(1) Scribe the hood hinge outlines on the hood and
(2)
Drain the cooling system and remove the bat-
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