Removing Rear Hub and Brake Drum Assembly

Before installing puller to remove rear hub and brake drum assembly, remove axle shaft nut, and screw it onto the axle shaft with the castles on the nut pointing inward (see Fig. 591). The nut should be screwed down until it is flush with end of shaft, then apply puller in the regular way. Placing nut on shaft prevents mushrooming or swelling end of shaft when pulling off drum.


Installing Drag Link

To provide additional clearance between drag link and front brake shaft housing, the end of the drag link, which was formerly assembled to the rear, is now assembled to the front. This necessitated relocating the lubricator fittings so they would be easily accessible when the position of the drag link was reversed.

When installing a new drag link, note that on one end of the drag link the opening for the ball arm is approximately 3/8 inch from the end of the drag link (this end must be assembled to the spindle arm). On the opposite end the opening is approximately 1 3/8” inches from the end of the link (this end is assembled to the steering gear arm). See Fig. 592.


Model A Engine Lubrication


For correct engine lubrication a high grade, well refined oil is absolutely essential.

As a guide to the proper viscosity or body of oil for summer and winter conditions, which vary for different territories, the lubrication charts of reputable oil companies should be consulted. In general, an oil having the body of S. A. E. viscosity No. 40 corresponds approximately to our M-515-A and B and is accordingly recommended for summer use.

For winter use, S. A. E. oil specifications No. 20 can be used. It is necessary, however, for winter use, that such an oil have a low cold set.

A large number of oil companies are stamping containers and indicate on their charts S. A. E. numbers. This practice is desirable because of the fact that it assists the owner to obtain the proper oil for his engine.

Shock Absorber Adjustment

Cold weather adjustment for cars equipped with shock absorbers having square end needle valve is made as follows:

Rear shock absorbers—Screw needle valve in until it seats, then back valve off 1/2 to 5/8 of a turn.

Front shock absorbers—screw needle valve in until it seats, then back valve off 3/8 of a turn.

Shock absorbers provided with needle valve pointers—set rears at 3 to 4, fronts 2 to 3.

Check level of glycerine in reservoir. Every 5000 miles the level of the glycerine in the reservoir should be brought up to the filler plug opening.


See that the electrolyte in the battery is at the proper level and all connections are clean and tight.

Engine Oil:

See that the oil pan is filled with the proper grade of winter engine oil (see page 291, October Bulletin).


See that hose connections are tight and in sections where freezing weather prevails that the radiator is filled with anti-freeze solution.

New Flexible Front End Support

new Flexible Front End Support

One of the problems which has constantly confronted automobile engineers is to prevent Engine vibration being transmitted to the chassis. The latest Model ” A ” improvement along this line is the introduction of a flexible front end support for the engine. The upper half of this support is bolted to the cylinder front cover. The lower half of the support is sup- ported on the cross member by flexible springs (see Fig. 597). These springs allow the engine a free vertical motion, yet hold it within definite limits. The result is an engine support that is simple in design and operation and frees the car from unpleasant vibration periods.

The support is standard on all new cars and trucks and can be easily installed on cars not so equipped by proceeding as follows:

The list price of the support complete with parts is $1.65. The labor charge to the customer for installation must not exceed $6.00.

Instructions for Installing:

  1. Drain water from radiator
  2. Remove hood.
  3. Take out mat and floor boards.
  4. Disconnect either the battery cable or ground connector from battery.
  5. Remove the two accelerator bracket cap screws.
  6. Unhook accelerator to carburetor rod, also throttle control rod and lift off accelerator bracket.
  7. Remove the two bolts from both engine rear supports
  8. Remove both engine pans
  9. Disconnect starter switch push rod and slide rod back out of way.
  10. Remove front splash shield.
  11. Disconnect cut-out, horn and head- lamp wires and remove radiator.
  12. Disconnect carburetor adjusting rod from carburetor and loosen the two exhaust pipe bolts.
  13. Remove the two cylinder front cover screws shown in Fig. 598.
  14. Remove one of the front spring clips, loosen the other and remove starting crank bearing.
  15. Screw off starting crank ratchet nut.
  16. Jack up engine sufficiently high to permit withdrawing fan pulley over top of front cross member (To prevent damaging oil pan, place a small board between top of jack and oil pan.)
  17. Saw off cross member at dotted line shown in Fig. 598.
  18. Enlarge the 1/2 inch hole in front cross member to 3/4 inch Important: Before enlarging the 1/2 inch hole make certain that the center of the hole is exactly 1 inch ahead of the rear flange of the front cross member (see Fig. 599) if not, hole must be filed to suit. After enlarging the hole to 3/4 inch be sure to remove all burrs and cuttings and thoroughly clean out cross member. This is important.
  19. Slip leather washer A-6033 over threaded end of support stud, sliding washer back on stud until flat side of washer rests against flat side of support.
  20. Place a little grease on the bottom of spring A-6031 and position it in bottom of cross member, lining up hole in spring with hole in cross member. The side of the spring which has the raised spring retainers is placed next to cylinder front cover.
  21. Bolt support to cylinder front cover by means of two lock washers A-22330 and two cap screws A-21240.
  22. Replace fan pulley.
  23. Lower engine sufficiently so that springs A-6032 can be slipped over the two bosses on the support and the raised retainers on the flat spring.
  24. Next lower front end of engine down as far as it will go, making sure that neck of leather washer A-6033 lines up with hole in flat spring.
  25. Slip brass bushing A-6034 over threaded end of motor support stud which extends through cross member, making sure that neck of bushing enters hole in cross member.
  26. Place spring A-6035 over stud, then screw on castle nut, running the nut down sufficiently far to permit locking it in place with cotter key.
  27. Next replace the four rear motor supprt screws. If it is necessary to jack up the engine in order to line up the cap screw holes in the rear engine supports, apply the jack under the front radius rod ball cap. After installing the rear motor support screws check the new motor support to make certain that the parts are in exact relationship to each other as shown in Fig 597. This is important. If the leather washer A-6033 is in contact with flat spring A-6031, or if coil springs are closed, one or both of these conditions will absolutely defeat the action of the support.
  28. After tightening the two exhaust pipe clamp bolts, the relation of the front motor support parts should again be checked. This completes the installation of the support and the reassembling of the major parts. The balance of the job can now be built up in the regular way.
  29. Before installing the engine pans, bend up the end of both pans as shown in Fig. 600, making sure that the edge of the pan which has been bent up clears front cross member.
  30. After building up the job make certain there is at least YQ inch clearance between the arm on the universal joint housing cap and the center cross member (see Fig. 601). If there is not at least 1/16 inch clearance, it will be necessary to remove the cap and grind off a little stock from the arm until required clearance is obtained.






If when the rear motor support arms are bolted to the engine the front support does not have from 1/64 to 3/64 clearance between leather washer and top of flat spring, loosen the four bolts holding rear support bracket to motor, also loosen the six small bolts which clamp rear support brackets to frame. Next remove nut and spring and washer on lower end of support stud and jack up front end of motor approximately 3/8 inch. With the front end of the motor raised 3/8 inch, tighten the six small bolts which clamp rear support brackets to frame, then tighten the four bolts holding rear support brackets to engine, next lower front end of engine and reassemble spring, washer and nut. This should provide proper clearance between leather washer and flat spring.

If the lower coil spring is closed and there is excessive clearance between leather washer and top of flat spring, repeat the above operation with the exception that the rear end of the engine is jacked up 3/8 of an inch instead of the front end.

Single Plate Clutch

Single Plate Clutch

The new single plate clutch now standard for Model “A”cars and “AA”trucks is composed of two major units, namely, the cover plate assembly A-7563 and the clutch disc assembly A-7550 or AA-7550.

The cover plate assembly consists of a cast iron outer driving plate and a stamped cover plate in which are mounted twelve pressure springs and six release levers. These springs are in direct action against the pressure plate and automatically compensate for all wear of the friction facings. This feature eliminates any necessity of adjusting the release levers.

The driven member or clutch disc assembly is composed of a flat steel disc and two friction facings. The facings are riveted to both sides of the driven disc. The disc is slightly dished in the form of a cone. With this construction the outer and inner edges of the clutch disc facing, start to engage first and as the clutch engages when the pedal is allowed to come back the spring pressure in the clutch flattens out the clutch disc and the entire lining surface picks up the load evenly. This feature assures exceptionally smooth clutch engagement.

Moulded friction facings are used because of their long wearing qualities. They also successfully withstand higher temperatures as they contain no cotton element.

Repair parts and exchanges

The only repair parts dealers will stock are the clutch disc assemblies A and AA-7550, clutch disc facings A-7549B and AA-7549, facing rivets A-22993 and pressure plate and cover assembly A-7563.

Should any part of.the pressure plate and cover assembly fail, return the entire assembly to the Branch, and a new assembly will be furnished at an exchange price of $3.25 net. The price to the customer will be $4.25.

Under no circumstances will dealers attempt to replace any parts in the pressure plate and cover assembly, as the lever height when under spring pressure must be set with specially designed fixtures.

The following is a list of single plate clutch and related parts which will be supplied through service:

((Table pg 296))

Service Suggestions


The pressure springs automatically compensate for all wear of the friction facings. Readjustment of the release levers must never be made under any circumstances.

The only adjustment for clutch wear is made at the bottom of the clutch pedal. The pedal must have 1 inch free play or movement before it starts to disengage the clutch.

Grease on friction facings will cause the clutch to chatter during engagement or sometimes slip at high speeds. The remedy is to remove the clutch and install a new set of clutch discs facings.

Occasionally, due to an improperly adjusted clutch pedal o r continuous abusive slippage, the clutch pressure plate may develop small radial heat cracks. If the pressure plate is not grooved, and these cracks are not large, simply polish the face and replace the unit. These heat checks will cause no harm.

It is not necessary to return clutch driven members to the factory for replacement of worn friction facings, as this operation may be done in your own shop. Before facings are replaced, make certain that the driven member otherwise is in good condition.

The saw steel driven disc is slightly dished to provide smooth clutch engagement. When new friction facings are installed be certain that the rivets are drawn down tightly.

Drivers should b e instructed that riding the clutch pedal is a bad habit, as it causes the clutch to slip. The foot should be placed upon the clutch pedal for a definite purpose only—that is to change gears.

New Solid Brake Cross Shaft

New Solid Brake Cross Shaft

A new service brake cross shaft assembly has been designed and is now standard on all cars and trucks. The new shaft replaces the old style cross shaft and equalizer assembly, as the old assembly is obsolete and will not be carried for service.

The new shaft is unusually efficient, simple in design and reduces the number of cross shaft parts.

The following parts are required to install the new service brake shaft assembly for car and truck:

((Table top of 298))

The following cross shaft and equalizer parts are obsolete and will not be supplied after present stocks are exhausted. If any of these parts are ordered, the parts necessary to install the new brake cross shaft should be furnished at the price of the part or parts so desired.

((Table left column 298))

When the solid brake cross shaft is installed on cars equipped with adjustable brake rods, it will be necessary to substitute A-2466 adjust- able eye for the A-2461 clevis on the rear rods.

When installing solid brake cross shaft on cars and trucks equipped with hand brake lever at side, an A-2491-R or AA-2491-R cross shaft guide must be installed (see Figs. 603 and 604).

((603 + 604))

The brake rod holes in cross member must also be enlarged to provide sufficient clearance for the brake rods (see Figs. 603 and 604).

When used on cars equipped with solid brake rods, it will be necessary to change the solid rods into adjustable rods.

This can be done by sawing off the ends of all four rods 33″ from the center of the button on the rods (see Fig. 605) and running a 5/16—24 thread back 2″ from the end of the rod, then installing locknut A-21700 and adjustable eye A-2466. The length of the rod measured from the centerline of both eyes should then be adjusted to not more than 51 7/16 or less than 51 1/2 (see Fig. 605).


When installing a solid brake cross shaft on trucks equipped with adjustable front brake rods, it will be necessary to shorten the intermediate rod AA-2500. This is done by sawing 5/8” off either end of rod, threading the rod 2” back with a 5/16—24 die and installing lock nut A-21700 and adjustable eye A-2466. The length of the rod measured from the centerline of both eyes should then be adjusted so that it measures not less than 38 5/8 or more than 38 11/16 (see Fig. 605).

When installing the new cross shaft on trucks equipped with solid front brake rods, it will be necessary to make an adjustable rod out of the front rods in the same manner as described for the car. It will also be necessary to rework the intermediate rod AA-2500 as described in preceding paragraph.


Installation and Adjustment

The oilless type bearings on the ends of the new solid brake cross shaft are assembled to the frame by the use of A-2479-B shims and A-2478-B brackets (see Fig. 606). When assembling, a small amount of grease is required in bracket as the outside of the bearing must rotate slightly inside of the bracket in order to preserve alignment when flexure of the frame occurs.

After installing cross shaft install brake pedal to cross shaft rod. The adjustable clevis end of the rod is assembled to the brake pedal—the non-adjustable end, to the lever on the cross shaft (see Fig. 606).

A slightly different procedure is followed in adjusting this rod depending on whether the car is equipped with a single plate clutch or a multiple disc clutch as the brake pedals used on cars equipped with the single plate clutch are provided with a stop.

If the car is equipped with a multiple disc clutch adjust the rod as follows: Hold the tip of the rod against the rear flange of the center cross member, then adjust the clevis on the opposite end of the rod until the brake pedal arm clears the underside of No. 1 floor board by 1/2” to 3/4”.

If the car is equipped with a single plate clutch, pull the brake pedal all the way back until it is against its stop—then adjust the rod until there is approximately 1/16” clearance between end of rod and rear flange of center cross member (leaving a little clearance between end of rod and cross member prevents any possibility of the end of the rod rubbing against the cross member and causing a squeak).

After adjusting the break pedal to cross shaft rod, assemble side pull rods to brake operating and cross shaft end levers. When assembling the side pull rods, pull the brake operating levers on the front axle back and the brake operating levers on the rear axle forward (taking up all idle movement). Then with the levers in this position adjust the length of the side pull rods so they can be assembled to brake operating and cross shaft end levers.

Next adjust brakes by turning up the adjusting wedges as described on page 202 of the January, 1928, Bulletin.

After the brake rods have been correctly adjusted car owners should be notified that this adjustment must not be altered. Service brake adjustments must be made only by means of the adjusting wedge at each brake.

Generator Charge Rate

Should be adjusted to suit individual requirements. For average driving during cold weather a charging rate of 10 amperes at 1500 R. P. M. will prove satisfactory.

Phaeton and Roadster Door Handles

The new inside and outside door handles which are now furnished as standard equipment on open cars can be easily installed on Phaetons and Roadsters not so equipped, by proceeding as follows:

  1. Remove old lock.
  2. Place new lock in place, fastening with two screws to locate.
  3. Drill through square hole in lock dog, using a 11/32-inch diameter drill. Drill squarely through outside panel.
  4. Using a 1/2-inch diameter drill, enlarge hole in outer panel, drilling from outside of door.
  5. Insert handle assembly and place escutcheon plate against door panel; with holes in vertical position drill 2 holes 3/16-inch diameter.
  6. Remove handle and escutcheon.
  7. Enlarge the two 3/16-inch holes by redrilling to 29/64-inch diameter.
  8. Remove lock.
  9. Insert reinforcement A-35634 and line up with three holes now drilled in outer panel.
  10. Insert two clinch on nuts A-21573 through holes in panel and reinforcement and peen over on outside panel.
  11. Assemble lock, placing all screws in place.
  12. Place pad A-35630 under escutcheon and insert shank through dog and apply two screws A-20214.
  13. Place washer A-22308 on inside of door against cardboard and place handle A-35632 on end of square shank and fasten on with screw A-20212.

Carburetor Choke Lever

The carburetor choke lever has been redesigned to permit easy choking when cranking the engine by hand. This change consists of adding a hole at the end of the lever (see “A,” Fig. 609) so that a wire or piece of twine can be easily attached for choking.


Transmission Shaft and Gears Held to Closer Limits

The intermediate and high sliding gear and the low and reverse sliding gear are now fitted to exceptionally close limits on the trans- mission main shaft. In addition the parts are selectively assembled. This procedure insures extremely accurate fitting and it eliminates any possibility of the gears coming out of mesh. The new dimensions of these parts are as follows:


Transmission main shaft A-7061 (See “D,” Fig 610) changed outside diameter from 1.2465/12475 to 1.2485/1.249 Width of splines (See “W,” Fig. 610) changed from .3095/.3115 to .308/.309.

Transmission low and reverse sliding gear A-7100 and transmission high and intermediate sliding gear A-7101, the large diameter of the splined hole in these parts has been changed from 1.2490/1.2505 to 1.2495/1.2505.

Due to the close limits to which these parts are held it will be necessary when installing new shaft and gears to assemble the parts by selective fit.