| Chrysler Air-Raid Siren Maintenance Manual | |
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ENGINE The Chrysler 8 cylinder Industrial Engine, which
provides the power for the Siren, has been designed and built to high
quality standards. With a reasonable amount of
care and proper maintenance attention, highly satisfactory and
dependable performance is assured. The following text is provided as a guide in
performing such routine operations as can be handled by the Siren
operator, as well as containing condensed maintenance information and
specifications. In order to maintain the original high standard of
performance of the Chrysler engine, only competent mechanics, having
access to suitable tool equipment, should be assigned to perform any
major repairs. If the facilities of the user are not adequate, it is
recommended that the service department of the nearest Chrysler
Corporation dealer be consulted, or write to the Chrysler Corporation,
Industrial Engine Division, 12200 East Jefferson Avenue, Detroit,
Michigan. IMPORTANT: ENGINE TUNE-UP To keep the engine at the highest point of
efficiency, it should be frequently checked and, if necessary, tuned up. The following points should receive attention: Spark plugs-clean electrodes and porcelains and adjust
spark gap to .025 inch. Inspect and dress, if necessary, the breaker points in
the distributor and adjust the gap to .018 inch. Check distributor cap and rotor for cracks or
corrosion. Inspect condenser lead wire for damaged insulation. Check ignition timing. (Distributor points should
start to open when number one piston is on top dead center, firing
stroke.) Check valve tappet adjustment. (Hot engine-intake
.010", exhaust .012". Cold engine-intake .012", exhaust .014".) Clean sediment bowl and screen on fuel pump and
gasoline filter. Check ignition wires for damaged insulation, or loose
connections. Test battery (reading should not be below 1.225). Check and adjust carburetor float level. (See
carburetor instruction.) Check manifold heat control valve. Be sure valve
operates freely. GENERAL The engine is of L-head, 8 cylinder, full length
water cooled, 4 cycle type, having a 3-1/4" bore, 4-7/8" stroke and
323.5 piston displacement, developing 140 horsepower. PISTONS The pistons as used in the Siren engine are cam ground
and of the four piston ring design. Should it become necessary through normal wear to
replace pistons, pins or rings, it is always advisable to check the
cylinder bores for out-of-round and taper. If the check of the cylinder
bores show that they are more than .002" out-of-round or tapered more
than .0015" it is recommended they be reconditioned with special
equipment and fitted to the following specifications. PISTONS Fitting Clearance
.003" Piston Pins Pin Size
51/64" x 2-3/4" Clearance in Piston
Thumb Push Fit At 130° Temperature In Connecting Rod
Bushing Thumb Push Fit At Normal Room Temperature Piston Rings Compression Rings (top) CAMSHAFT The camshaft is of "Hi-lift' design which gives
greater power output at high speeds and better idling characteristics.
It is chain driven and supported by six bearings. All camshaft bearings, except the rear, are removable
but seldom, if ever, have to be replaced. If the bearing clearance is
excessive, new bearings may be pressed in place after the camshaft and
camshaft bearings have been removed. Replacement bearings are finished to close limits
when manufactured and do not require reaming, scraping or burnishing. Bearing clearance-No. 1 bearing
.001" to .003" CRANKSHAFT The crankshaft is of drop forged high carbon steel,
statically and dynamically balanced, with eight counterweights and
supported by five bearings of steel backed, babbitt, lined, replaceable,
precision type. Very close manufacturing tolerances, make it possible
to replace bearing shells without scraping or fitting. Bearing clearance desired .001" to .002" CONNECTING RODS Connecting rods are drop forged from highest quality manganese
forging steel with an "I" beam section or design to provide extra
strength and light weight. The upper, or piston pin bushing, is of bronze, with the lower
bearing of babbitt, bonded to steel and Superfinished to provide a
mirror smooth surface. Connecting rod bearings are easily replaced by
removing bearing caps and bearing shells. Replacement bearings require
no reaming or fitting. Lower Bearing Bearing clearance
.001" to .003" Upper Bushing Material
Bronze VALVES With dome shaped heads, the intake and exhaust valves
are manufactured from the finest of materials, having high resistance to
corrosion, pitting or softening under high temperatures and are
Superfinished to provide quieter operation and longer life. The exhaust valve seat inserts are manufactured from
a special hard metal capable of withstanding hard service and are
replaceable where the occasion warrants. The valve springs are of special spring steel,
designed so that the heavy end of the spring is placed "up", thus taking
the load off the tappets at the beginning of spring compression. When
replacing, the closely spaced coils should be installed at the top, or
in the recess of the cylinder block. The valve guides, which insure the valves seating
properly, are finished to precision limits and, with the valve stem
Superfinished, a practically frictionless surface results. The valve tappets, which ride the cams of the
camshaft and give the valves the correct action, have self locking type
screw without lock nuts and any adjustments to the tappets should be
made with the engine running and at normal operating temperature. Stem diameter
.340" to .341" Valve Guides Guide diameter to ream after installing Stem clearance in guide Valve Seats Angle
45° Valve Springs Spring pressure, compressed to 1-21/32"
129 to 137 lbs. Valve Tappets Clearance for valves (engine hot) Valve Timing Valve tappet clearence to check timing |
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