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ENGINES--&CYLINDER
9-27
(3) Screw the new filter on the base until the gasket
on the filter contacts the base.
(4)
To obtain an effective seal, tighten filter
by
hand
the additional number of turns
indicated on the
replacement filter.
Start engine and inspect for leaks.
REPAIR OF DAMAGED OR
WORN THREADS
Damaged or worn threads can be repaired by the
use of Heli-Coils. Essentially, this repair consists
of
drilling out the worn or damaged threads, tapping
the hole with a special Heli-Coil Tap, and installing a
Heli-Coil Insert into the tapped holes. This brings the
hole back to its original thread size. (See Fig. 57).
The following chart lists the threaded hole sizes
which are used in the engine block and the necessary
tools and inserts for the repair of damaged or worn
thread. Heli-Coil tools and inserts are readily avail-
able from automotive parts jobbers.
PART 3
EIGHT CYLINDER ENGINES
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 Section of this manual.
(3) Tighten the intake manifold bolts to 270 inch
pounds torque for 273 cubic inch engine and
40
foot
pounds torque for 318 cubic inch engine and
50
foot
pounds torque for 361, 383 and 426 cubic inch en-
gines.
(4)
Perform the cylinder compression test. The
compression should not vary more than 20 pounds
between cylinders for 273, 318, 361 and (383-9:2 to 1
compression ratio and 25 pounds for (383 with
10:0
to 1) 413 or 426 cubic inch engines.
(5)
Clean or replace the spark plug as necessary
and adjust the gap to .035 inch. Tighten to 30 foot-
pounds torque using new gaskets.
(6) Test the resistance of the spark plug cables and
if the resistance
is more than 30,000 ohms, 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 the ve-
hicle operating at high speeds
or
hauling trailers
have the 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,
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
Fig. 58-Cleaning
Filter Element
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