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.


To still further increase the strength of the coupe deck front pillar (right and left hand), new pillars A-47460-D and A-47461-D have been released for both production and service. The old style pillars were riveted to the wheelhouse body side assembly. The new pillars have been lengthened and extend down to the floor side sill rear, and are riveted to that part. When an old style pillar is to be replaced with a new design, replace both the right and left pillars. For service installation, bolts, nuts and lockwashers may be used in place of rivets. Fig.1181 shows the bolts, nuts, etc., to use. The center bolt A-20294 is installed only when Coupe is equipped with rumble seat.


Several improvements have recently been made in Model A engines which tends to still further lessen oil consumption. A shield is now provided which fits around the oil pump and insures a more uniform distribution of oil to all cylinders. The oil pan tray has also been lowered 1⁄8”· This has been accomplished by correspondingly raising the height of the bead in the oil pan tray. (See Fig. 1204.) The piston ring pressure has been reduced to approximately 5 pounds. In addition the width of the slot in the oil control rings has been changed from .040″ to .072″. Sometime ago the size of the oil passage holes in the pistons were changed from .100 to .125. This was covered in the May, 1931, Service Bulletin. When installing these improved parts in old cars or trucks, they should all be installed at the same time. Under no circumstances install an oil shield without installing the new oil pan or vice versa.