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Clutch Fluid Drive
Engine 8 Cyl
||Lock service can be divided
two ways : the easiest and most frequently performed is that of cleaning
and lubricating lock mechanism. Oil should never be used in locks.
Oil is likely to gum or collect dust and cause sticking of the delicate
lock mechanism. Nevertheless many car owners oil their own locks which
make it necessary for the service man to clean them out.
A pump type oil can filled
with carbon tetrachloride or high-test gas can be used to flush
out a lock. This breaks down, dislodges, and flushes out accumulated
grease, oil, and dirt. Then, after waiting a minute or two for this
cleaning liquid to evaporate or, better yet, after blowing the lock
out with compressed air, a lubricating gun of fine graphite is used
and a charge of this is forced into the lock mechanism.
After having done the foregoing, the
key should be inserted and moved slowly in and out to distribute
the graphite over all moving surfaces.
The foregoing will put most locks into
such condition that they will operate smoothly; but where it does
not it is usually best to replace the entire lock cylinder with
a new one, since repairs to the many parts that would be worn would
cost more than the new cylinder.
Replacing lock cylinders is generally
accomplished in one of two ways. Either the cylinder is held by
a retaining screw as shown in figure left and may be removed by
loosening the screw, or in the constructed illustration below.
key is inserted and turned to the left while a sharp instrument
(a paper clip will do) is inserted in a small hole in the cylinder
to depress a retaining spring.
The key is then further turned to the
left and the cylinder removed with the key. The following information
on key service covers specifically Briggs and Stratton locks used
on 1938 Chevrolets (but applies to many other cars, too).
The side bar type lock is used on all
1938 passenger cars for the ignition, door, and deck. This lock
has six tumblers cut to four different depths. Service locks have
the tumbler depths indicated by colors, "B" for black,
"N" for nickel, "Y" for yellow, and "C"
for copper. Key codes, furnishedwith all key-cutting machines, consist
of numerals for the tumbler positions and letters for the tumbler
To assemble tumblers in an uncoded
lock cylinder :
First, hold cylinder in the left hand
with head of the cylinder away from you (left) and insert tumblers,
ribbed side toward you and long point down.
Second, start from the head and drop the
indicated tumblers in their proper slots in the order called for by the
code. After all are in place, check for correctness with the code (centre).
Press tumblers down with finger (right).
Third, insert one tumbler
spring above each tumbler in round cavity (left).
If springs are tangled do not pull tumbler springs apart—unscrew
Fourth, reverse cylinder in left hand
so that head of cylinder is now toward you. Insert spring retainer
(right), so that its six sprongs each slip into one of the springs,
and the two large end prongs slide into the slots at either end
of the cylinder.
Press retainer down with forefinger
of left hand and in that position insert cylinder into checking
and staking tool (left). Still holding retainer in place with finger,
pull lever on the tool over top of retainer to hold it in position
Fifth, to check : Insert the proper
key and rotate cylinder clockwise about 1/8 turn. If lock is properly
set up, cylinder will turn, otherwise the bar will not be released
and cylinder cannot be rotated ; in which case remove and reset
Sixth, if cylinder rotates, return it to
the original position and remove key. Tighten set screw in left end of
tool to prevent turning of cylinder.
Seventh, stake down the retainer. The retainer
is held in place by forming the cast metal over both edges of the retainer
ends from the outside, using staking tool provided. Hold staking tool
at a right angle. Form the cast metal of the cylinder over the retainer
with a single stroke of a light hammer for each of the four staking positions.
Eighth, release set screw and remove cylinder.
tumblers have been improperly assembled and not according to code, the
tumblers can be removed from cylinder by holding cylinder with the tumbler
slots down and pulling the bar out with fingers and jarring cylinder to
shake the tumbler out. This procedure is necessary because after the tumblers
have been pressed down into the cylinder as illustrated, the tumblers
are held in their slots by the bar.
Side bar key cutting machine
When cutting keys in the key cutter, the
cutting positions are located by the spacer lever and the depths by the
depth bar. To cut a key proceed as follows :
First, insert blank from right, with edge
to be notched toward punch. Push blank all the way into stop. Tighten
thumb screw to hold key blank in place.
Pull spacer lever down to position 1 for
first cut. Then adjust depth bar by compressing carriage with the thumb
of right hand; in the direction indicated by arrows, move depth bar with
left hand until depth letter required appears in indicator window. Release
Caution: Be certain
that the spacer lever is in correct indent and depth letter appears fully
in the indicator window.
Second, to cut key, hit punch a quick, sharp
blow with a light hammer.
Third, move spacer lever to position 2, compress
carriage, and shift depth bar to letter required. Punch depth.
Fourth, continue as above, cutting required
depths for positions 3-4-5-6.
Check cut key with codes by inserting it
into key decoder.
there are two or more depths the same, after once setting the depth bar
you can shift the spacer lever to any position calling for this depth,
and make all these cuts without changing depth bar.
Using key decoder
- Hold key decoder in left hand, and insert
key from the right.
- Read code from head of key to tip, from
positions 1 to 6. The depths cut are shown by the indicators under each
- An indicator reaching into the copper
strip indicates depth "C." Indicator reaching into nickel
strip indicates depth "N" in black strip "B" and
in yellow strip “Y”
- The code of the key illustrated in the
key decoder reads :
Caution: The tip
of the indicator must split the colored strip. Save the gauge key, furnished
with each key decoder, to frequently check key decoder. Gauge key is cut