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M-244
CHRYSLER 1939 SPECIAL SHOP NOTES
ENGINE NUMBER LETTERING:—Letters immediately
foUowing engine number (not in circular pads) denote foUowing 'special standard' sizes: 'A'—.020"
larger standard cylinder bore. *B'—.010" smaUer
standard m a m and connecting rod bearings. 'AB'—
cylinder bore, main and connecting rod bearings
'special standard'.
FRONT END ASSEMBLY (UNIT) REMOVAL:—For
work on front of engine, remove radiator and fender
assembly as a unit as follows: remove hood and side
panel assembly, front bumper assembly, and radiator lower splash pan. Disconnect headlamp wiring
at junction block on left fender lower shield. Remove front wheels and drain cooling system. Disconnect radiator support studs and radiator hoses.
Disconnect fenders at running board and body. Lift
radiator sheU, core and fenders off in an assembly.
ORIGINAL PISTON & CYLINDER BORE SIZES:—
Original production (new engine) piston and bore
sizes indicated by letter located as follows:
Piston Size—Letter stamped on piston head (number following letter on Dodge pistons is weight).
Bore Size—Letter stamped on pad at top of block
on distributor side.
.020" Oversize Pistons and Bores—Graded in same
steps as for standard sizes except .020" larger and
marked P, Q, R, S, and T.
CHRYSLER C22, DE SOTO S6
Piston &
Piston
CyUnder
Engine Mark
Diameter
Diameter
A
3.37425-3 37475".
3.37475-3 37525"
B
3.37475-3 37525".
3.37525-3.37575"
C
3 37525-3 37575"
3 37575-3.37625"
D
3.37575-3 37625"
3 37625-3 37675"
E
3.37625-3.37675"
3.37675-3.37725"
CHRYSLER C23, C24
A
3.24925-3.24975".
3.24975-3.25025"
B
3 24975-3.25025".
3.25025-3.25075"
C
3 25025-3 25075"
3 25075-3 25125"
D
3.25075-3 25125"
3.25125-3.25175"
E
3.25125-3 25175"..
3.25175-3.25225"
DODGE D l l
A
3.2495".
3.24975-3.25025"
B
3.2500".
3.25025-3.25075"
C
3 2505"
3 25075-3.25125"
D
3.2510".
3.25125-3.25175"
E
3 2515"
3.25175-3 25225"
PLYMOUTH P7, P8
A
3.12415-3.12465" . 3.12475-3.12525"
B
3.12465-312515"
3.12525-3.12575"
C
3.12515-3.12565".
3.12575-3.12625"
D
3.12565-3.12615"
3.12625-3.12675"
E
3.12615-3.12665".
3.12675-3.12725"
Additional Piston Sizes—AA pistons .0005" smaUer
than A pistons, EE pistons .005" larger than E
Dodge Steel Strut Piston Weight—All 6 pistons in
one block must be alike (same number on head).
DODGE Dll—PISTON WEIGHTS
Piston Mark
Weight (in lbs.)
8 .
91-.92
9
.92-.93
10
.93-.94
11
.94-.95
12
.95-.96
13
.96-.97
14
.97-.98
REPLACEMENT PISTONS:—Finished Pistons—Furnished standard and .003", .005", .010", .015", .023",
.025", .030", .040", .050" and .060" oversize.
Semi-finished Pistons—Furnished in two sizes:
(1) for bores standard to .023" oversize, (2) .025-
ALL CHRYSLER,DESOTO, DODGE, & PLYMOUTH MODELS
.050" oversize. Pistons slotted and finished except
for skirt. Skirts must be cam ground.
ENGINE ASSEMBLY REMOVAL:—Remove Front End
Assembly (see above). Remove front floor boards
and propeUer shaft (see removal instructions below
for cars equipped with two shafts and center bearing). Disconnect: hand brake cable, starter cable,
battery ground cable, speedometer cable and gearshifter rod and cable at transmission (on cars with
overdrive remove solenoid coU and control cable),
feed Une at fuel pump, oU gauge line at engine, coil
wires, heater indicator tube and bulb at head, exhaust pipe at manifold, throttle controls and clutch
linkage. Attach hoist to engine (remove air cleaner
and horns if necessary). Remove front and rear
engine support bolts. Loosen engine side splash
aprons and l i f t engine assembly out of car. NOTE;—
On Plymouth P7, remove transmission cover.
Installation:—Reverse procedure listed above. IMPORTANT—In order to secure proper engine alignment when instaUing engine assembly, loosen exhaust pipe support brackets and run engine a few
seconds with engine mounting bolts loose. Then
tighten mounting bolts and exhaust pipe brackets.
MAIN BEARINGS:—Front Bearing Cap Removal. Front
oil pan seal plate must be removed to take off front
bearing cap. After oU pan removed, take out 2
screws on lower edge of timing chain cover and free
oil seal plate. Bearing cap wUl then be accessible.
NOTE—Separate plate not used on C23, C24.
Adjustment—Replace bearings. Do not shim or fUe
bearing caps (see Replacement Main Bearing Caps
following). With caps removed, bearing upper
halves may be rotated out without removing crankshaft by using pin installed in oU hole in shaft.
Replacement Bearings—Finished bearings furnished standard and .002", .010", .012" undersize.
Fitting Bearings—Check crankshaft for scoring. To
check bearing fit, use .002" feeler, %" wide, 1" long.
With cap removed, place feeler along center of
bearing, tighten cap. Bearing fit correct when slight
drag perceptible when turning crankshaft by hand.
Remove feeler, tighten cap Renew oil seals.
REPLACEMENT MAIN BEARING CAPS:—Available for
service. Identical with original cap except for stud
holes which are 1/64" larger and bearing cap
length which is 1/16" shorter. This allows for fUing
or shimming to obtain proper bearing fit.
CRANKSHAFT ODL SEALS:—Servicing—Car m a n u facturer recommends that new oU seals be i n stalled if chain cover or rear bearing cap removed.
Front OU Seal:—Leather oU seal mounted in timing
chain cover. When instaUing seal, leather should be
soft and pliable, soaked in thin oU for approximately thirty minutes, then roUed with smooth bar.
Rear OU Seal:—Located at rear bearing. Consists of
three separate seals as foUows: 1—Bearing oU seal
formed In two halves. Lower half mounted on rear
of bearing cap and held by retainer screwed (3
screws with lockwashers) to rear face of cap. Upper
half retained in same manner with retainer
screwed in place on rear face of crankcase. 2—Bearing cap seal. Groove on each side of cap (immediately to rear of stud holes) fitted with seal. Seal
assembled in groove with doubled-over end in
toward bearing. 3—Bearing cap gaskets. L-shaped
cap gaskets assembled around oU slinger groove (at
rear of cap). InstaU gaskets (one on each side).
EXHAUST VALVE SEAT INSERTS:—Refacing—Exhaust valve seat inserts must be reground (cannot
be recut due to hardness) with high speed grinding
stones (Tool C-372) used dry. Roughing stone—to
obtain fuU contact; Finishing stone—to obtain
proper finish. Stones must first be dressed for concentricity. Grinding tool centers on expanding pUot
inserted in clean valve guide (upper end must be
cleaned and chamfered with reamer to provide 60°
seat 1/16" wide for this pilot). Lubricate pUot with
few drops of oU. AU carbon or grease must be removed from valve seat before grinding. Finished
seat allowable runout .0005". Check with mdicator.
Replacement Inserts—Furnished .010" oversize. Use
special tool set C-386 (includes grinding and replacement tools). Inserts removed with special
puUer to avoid damage to engme block. Special
cutters (aUowing press fit for new insert) and
peening tools (securing insert in place) used with
pUot in valve guide (as above) for proper alignment. After installing, finish guide (see Refacing).
RADIATOR CORE REMOVAL:—Chrysler C22, De Soto
S6, Dodge D l l , Plymouth P7, P8. Remove hood and
side panels. Drain cooling system. Remove water
pump (Chrysler and Dodge only). Disconnect radiator hoses and take fan blades off pulley (De Soto
and Plymouth only). Disconnect headlamp wires
at junction block on left fender lower shield and
push forward through radiator core side flange.
Remove three radiator core-to-support capscrews
at each side. Lift core out. NOTE—Loosen lower
front screws of fender shield if necessary.
InstaUation—Reverse procedure listed above. Headlamp wires should be tied together at terminals
with a long piece of string, pass string through core
flange hole (toward the rear), assemble core and
pull wires through hole.
Chrysler C23, C24:—Remove complete hood assembly
and side panels. Drain cooling system. Remove
screws and bolts securing lower splash pan (at front
of car) to sheU cross member (below grille) and to
side shields, front wheels and front bumper from
frame. Free front end of fenders by removing 5 capscrews (fender-to-grUle shell) and 2 capscrews in
fender bracket-to-radiator support. Remove radiator hoses. Take out fan shroud bolts and Uft shroud
out. Free radiator sheU from support by removing
two capscrews at each side (just above top end of
outside grUle bars). PuU radiator shell forward off
car with fenders moved apart. Remove radiator core
support capscrews and lift core out. NOTE;—When
reassembling, secure bolts and screws which hold
shell and fenders in a half tight position, tighten
only after hood alignment obtained.
PROPELLER SHAFT CENTER BEARING REMOVAL
AND INSTALLATION:—Used on all passenger car
models with two propeller shafts. To remove, take out
rear propeUer shaft, disconnect front universal (at
rear of transmission), remove center beanng-toframe mounting screws, slide front propeUer shaft
(with bearing) out through frame opening in X member. To instaU, reverse procedure taking care
to replace bearing-to-frame spacer (if used).
HAND BRAKE ADJUSTMENT:—Fully release hand
lever (cable length adjusted by means of clevis at
lower end). Remove lock wire on anchor screw (on
right lower side), adjust for .015-.020" band to drum
clearance for lower portion of band, lock in place.
Back off large adjusting bolt nut at top untU free.
Loosen guide bolt lock nut (on mounting bracket),
turn adjusting nut (under locknut) for .015-.020"
band to drum clearance, tighten locknut. Tighten
large nut at top untU tension on either side of guide
bolt is just relieved (groove in nut must align with
ridge in lockwasher).
NOTE—Clearance between side of anchor & bracket
must not exceed .005". To correct, clamp anchor
bracket in vise and tap lightly with hammer.