Truck rear hubs AA-1113-F2 and AA 1114-F2 are now being used in 100% production. In these hubs the bearing sleeve is made integral with the hub. This construction eliminates the AA-1236-C rear hub sleeve and the A-23225 sleeve retainer rivet. The AA-1113-F2 and AA-1114-F2 hubs can be used interchangeably with the AA-1113-Fl and AA-1114-Fl hubs which have the sleeves installed.


Top dressing should never be applied when a top is new, it should be applied only after the top material has become very dull, checked or cracked. It is also important that the correct top dressing is used with rubber and pyroxylin coated tops. Use M-255 for Pyroxylin coated tops only, Use M-255-B for Rubber coated tops only.


A-46116-R lock cylinder and key assembly has been obsoleted. If calls are received for this part after present stocks are exhausted, supply A-46123-E lock cylinder and A-11586-C key. The key can be cut on your key cutting machine and the tumblers in the lock cylinder then fitted to the key.


Headlamp reflector surfaces that are exposed to sulphur fumes will turn the reflectors black. Rubber fumes from tires, etc., will also tarnish reflector surfaces. If any of these parts should become tarnished, they can be easily cleaned by dipping a soft cloth (preferably cotton flannel) into dry lamp black and rubbing the reflectors for a few minutes until their bright appearance has been restored.


To still further increase the strength of the floor side sill rear filler block A-35081-R.H. and A-35082-L. H., used on Tudor and Touring Cars the length of these blocks has been changed from 3″ to 6″; the length of the bevel on the edge of the block has also been changed from 1 3⁄8” to 4 1⁄8”. (See Fig. 1208.)

CORRECTION (July 1931)

Please refer to Fig. 1192 in the June Service Bulletin and change the width of the slot shown in A-11357-BR starter drive service sleeve, from 3⁄4″ to 1⁄2″.


To still further increase the strength of the A-6031 engine front support auxiliary spring, a flange has been added around the hole for the engine support stud and a bead added next to the hole. (See Fig. 1224.) This type of construction materially increases the strength of this part.

Oil Grooves in Main Bearings

After rebabbitting a cylinder block be sure to form oil grooves in the main bearings. (See Fig. 1226.) K. R. Wilson furnishes a tool for this purpose.


The back window in the De Luxe Coupe has been changed from a stationary window to a window which can be raised or lowered. This change is now standard equipment on the De Luxe Coupe and can be obtained as special equipment at extra cost for those desiring it in standard coupe bodies. When a rumble seat is installed in a standard coupe the adjustable back window will be supplied at no extra charge. It will of course be necessary for the dealer to notify the Branch as adjustable back window installations must be made at the Branch.

Due to the amount of labor and expense involved it would not be practical for dealers to attempt to replace a stationary window with an adjustable window in old coupes.


Fig. 1180 shows the new AA-5558-F 4811 long spring used under the school bus. This spring can also be used under trucks equipped with 16-leaf springs when the customer prefers more spring resiliency. It should, however, be explained to the customer that, in replacing a 16-leaf spring with the 48″ long spring, the truck must not be overloaded. It will also be necessary to move the shackle bracket forward 12 3/8“, as described on page 544 of the March Bulletin, and install the new A-21309 bolt and AA-4773 nut as described above.

This spring is serviced less the spring clip and the pivot seat assembly and is listed in the parts book under part AA-5560-F.


A-13007-E (32-32 C. P.) Head Lamp Bulb

When an owner desires brighter illumination this bulb can he used to replace the A-13007-C, 21-21 C. P. standard equipment bulb in all Model A and Model AA except those manufactured prior to March, 1929. This new bulb gives SO% brighter headlights both for high speed driving and for passing beam.

A-13007-D (21-32 C. P.) Head Lamp Bulb

This 21-32 C. P. bulb is interchangeable with the 21-21 or the 32-32 and represents a compromise between them. It gives SO% brighter headlights for high speed driving, without · increase in amperage for passing beam.

A-18570 (32 C. P., Single Filament) Spot and Stop Lamp Bulb

This higher power bulb will replace A-13465, 21 C. P. single filament in stop lamp and in spot light, with 5O% brighter effect. The spot lamp light beam using the 32 C. P. bulb will reach farther. The stop signal with the brighter bulb makes a more positive stop signal.


In addition to shock absorber instructions contained in the February 1931 Service Bulletin, the following information will prove helpful in servicing Hoodye shock absorbers. When overhauling an instrument always see that the two air vent plugs located in the flange cover are absolutely clean. These vents can be easily removed from the cover by means of a hammer and drift as shown in Fig. 1200. It is a good plan to install new vent plugs when overhauling a shock absorber. They cost but a cent apiece and they insure satisfactory results. The plugs must be in- stalled with the grooved side facing outward. The inner ends of the plugs are then staked to securely hold them in place. The staking operation should be cross-wise to the groove to avoid any possibility of closing the groove.

When assembling the shock absorber be sure the small steel check ball is in place in top of the wing. If the ball has been lost, be certain that the new ball installed is of the correct size. Two different size ball checks are used in production. A percentage of shock absorbers are assembled with a -h” diameter ball. In the remainder a 5/32“ diameter ball is used.

The 3/16” ball is listed under part A-24508. The 5/32“ ball under part A-24505. Extreme care must be used not to confuse or mix these parts. This is important. When the correct ball is used it will be .010 to .014 below the level of the wing.

On some of the earlier type instruments the stationary wing was anchored in place by means of lead caulking; all four corners of the wing were anchored in this manner. If the wing in one of these earlier instruments should become loose it can be tightened by driving BB shot into the small openings at each corner of the wing. A hammer and drift are used for this purpose. (See Figs. 1202 and 1203.)

When assembling the cover to the base see that the cover is screwed down tightly and that the locating mark on the cover lines up exactly with the locating mark on the base. (See Fig. 1110 in the February Bulletin.) This is very important. The cover should be drawn down the same number of turns as was used in removing it.

Never attempt to substitute string packing for the needle valve packing. If the packing is damaged, install a new needle valve assembly. A new reservoir gasket and packing ring should always be used when reassembling.