Model A Specifications

Wheel Specifications Tire Specifications Tire Tread Images Front Brake Specifications Rear Emergency Brake Specifications Front Axle & Spindle Specifications 7-Tooth Steering Gear Specifications 2-Tooth Steering Gear Specifications 2-Tooth Steering Gear Housing Casting 2-Tooth Steering Gear Box Information 600W Oil Usage Rear Axle Specifications Front Spring Specifications Rear Spring Specifications Cylinder Head Specifications Engine Specifications Piston Specifications Piston Ring Specifications Connecting Rod Specifications Camshaft Specifications Crankshaft Specifications Flywheel Specifications Valve Specifications Oil Pump Specifications Transmission Specifications Clutch Specifications Radiator Specifications Zenith Carberetor Specifications What Type Of Carburetor Do You Have? Water Pump Specifications Fan Blade & Belt Specifications Gas Tank Specifications Generator Specifications Battery Specifications Starter Motor Specifications Distributor Assembly Specifications Spark Plug Specifications Interior Lights Specifications Wiring Books Cylinder Block Specifications Windshield Wiper Information Sheet Metal Information Hood Specifications Vehicle Identification 1928-29 STANDARD COUPE (45-A) 1928-29 SPECIAL COUPE (49-A) 1930-31 STD & DLX COUPE (45-B) 1928-29 BUSINESS COUPE (54-A) 1928-29 SPORT COUPE (50-A) 1930-31 SPORT COUPE (50-B) 1929 CABRIOLET (68-A) 1930-31 CABRIOLET (68-B) 1930-31 VICTORIA (190-A) 1930-31 CONVERTIBLE SEDAN (400-A) 1928-29 TUDOR SEDAN (55-A) 1930-31 TUDOR SEDAN (55-B) 1929 STEELBACK FORDOR (60-C) 1929-31 2-WINDOW FORDOR (170-A,B) 1929-31 3-WINDOW FORDOR (BRIGGS) (155-B,D/165B,D) 1929-31 3-WINDOW FORDOR (MURRAY) (155-A,C/165A,C) 1930-31 SLANT WINDSHIELD FORDOR (160-A,B,C) 1928-29 LEATHERBACK FORDOR (60-A,B) 1928-29 STANDARD PHAETON (35-A) 1930-31 STANDARD PHAETON (35-B) 1930-31 DELUXE ROADSTER (40-B) 1928-29 STANDARD ROADSTER (40-A) 1930-31 STANDARD ROADSTER (40-B) 1930-31 DELUXE PHAETON (180-A) 1928-29 OPEN CAB PICKUP (76-A) 1930-31 OPEN CAB PICKUP (76-B) 1928-29 CLOSED CAB PICKUP (82-A) 1930-31 CLOSED CAB PICKUP (82-B) 1928-29 STATION WAGON (150-A) 1930-31 STATION WAGON (150-B) Model A Fordor Body Style Identification 1928-29 (60-A,B) LEATHERBACK 4 DOOR SEDAN 1929-31 (170-A,B) 2 WINDOW 4 DOOR SEDAN 1929 (60-C) STEELBACK 4 DOOR SEDAN 1931 (160-A) SLANT WINDOW 4 DOOR MURRAY SEDAN Model A Body Style Identification Front & Side View 1928-29 Front View 1928-29 Cowl Side View 1930 Front View 1931 Front View 1930-31 Cowl Side View Body Type ID Chart Passenger Vehicles Body Name192819291930*1931Standard Phaeton35A35A35B35BDeluxe Phaeton--180A180AStandard Roadster40A40A40B (Std.)40B (Std.)Deluxe Roadster--40B (Dlx.)40B (Dlx.)Standard Coupe45A45A45B (Std.)45B (Std.)Deluxe Coupe--45B (Dlx.)45B (Dlx.)Special Coupe49A49A--Sport Coupe50A50A50B50BBusiness Coupe54A54A--Tudor Sedan55A55A55B (Std.)55B (Std.)Deluxe Tudor Sedan---55B(Dlx. )Leatherback Fordor (Brown)60A60A--Leatherback Fordor (Black)-60B--Steelback Fordor-60C**--Cabriolet-68A68B68BCabriolet (Slant Window)---68CStation Wagon-150A150B*150BTown Sedan (Murray)-155A155C155CTown Sedan (Briggs)-155B155D155DStandard Fordor (Slant Window)---160ATown Sedan (Slant Window)---160BDeluxe Fordor---160CStandard Fordor (Murray)-165A165C165CStandard Fordor (Briggs)-165B165D165DStandard Fordor (2 Windows)-170A**170B (Std.)-Deluxe Fordor (2 Windows)--170B (Dlx.)170B (Dlx.)Victoria--190A190AConvertible Sedan---400A Body Type ID Chart Commercial Vehicles Body Name192819291930*1931Open Cab Pickup76A76A76B*76BClosed Cab Pickup82A82A82B*82B“A” Panel Delivery79A79A79B*79B“AA” Panel Delivery (131-1/2")85A85A85B*85BDeluxe Delivery (Standard)130A130A130B*130BDeluxe Delivery (Drop Floor)--130B130B“AA” Panel Delivery (157")---210A“A” Panel Delivery (Drop Floor)---225ASpecial Delivery---255ATown Car Delivery---295ADeluxe Delivery (“AA”)---300A * Change-over from 1929 to 1930 models was in January, 1930 for passenger cars & in June, 1930 for commercial vehicles. ** If you cannot decide if your car body is a 60C or a 170A you can quickly tell by examining the front door post. If it is all steel, it is a 170A. If it has wood parts, it is a 60C. How to Tell a Briggs From A Murray Glass Specifications To please the perfectionist, we offer Concours grade windows – intended for car show & points competition automobiles. These are superior quality 1/4" laminated safety glass (AS1 CAT-II). Exposed edges are beautifully polished or black edged & the original manufacturers sandblasted script (logo & date, sometimes referred to as the “bug”) is duplicated to reproduce the O.E.M. appearance (because they’re concours, tint options are not available). These details are applied with great care & meticulous craftsmanship. Black edging refers to the process used to seal exposed glass edges & was necessary in the early years of automobile manufacturing. Early laminated safety glass often separated at the edges, allowing water & other contaminants between the panes. The solution was to seal the edges with a sealant. Advances in the laminating process rendered black edging obsolete in 1941, but MAC's craftspeople have re-discovered & are practicing this lost art for the detail oriented customer. Wheel Specifications Material: Steel Diameter: 1928-29 21", 1930-31 19" Rim: Drop center type; width, 1928-29 2-3/4", 1930-31 3" Number of Spokes: 30, 1/4" diameter Tire Specifications Size: 1928-29, 4.50" x 21" 1930-31, 4.75" x 19" Recommended Tire Pressure: 35 Lbs Station Wagon: 5" x 21" or 19", pressure 40 lbs Tread Width: 21" = 3.75", 19"3.90" Tire Tread Images Firestone 19" or 21" Goodrich 19" or 21" Lester 19" or 21" Excelsior 19" or 21" Universal 19" or 21" Bedford 19" Front Brake Specifications Braking Power: Front, 40%; Rear, 50% Drum Diameter: 11" +/- .010" Drum Width: 1-3/4" Brake Shoe Length: 14" Brake Shoe Width: 1-1/2" Brake Shoe Lining Thickness: 3/16" Brake Shoe Material: Woven wire & asbestos Brake Rod Length: 51-7/16" thru 51-1/2" Rear Emergency Brake Specifications Drum Diameter: 9-5/8" Drum Width: 1-3/4" Brake Shoe Length: 28-3/4" Brake Shoe Width: 1" Brake Shoe Lining Thickness: 3/16" (original), 1/8" (ours) Brake Shoe Material: Woven wire & asbestos Front Axle & Spindle Specifications Material Chrome alloy forging Tensile Strength 125,000-145,000 PSI Caster 5" (forward tilt) Toe In 1/16" +/- 1/32" Camber 1-13/16" Spindle Bolt Diameter .8125" +/- .005" Spindle Bolt Length 5-5/16" Spindle Bolt to Bearing Clearance .001"-.002" 7-Tooth Steering Gear Specifications Turning Radius: 17' (34' diameter) Steering Gear Ratio: 1928-29, 11-1/4:1 Steering Wheel Diameter: 1928-29, 17-1/2" Pitman Arm Length: 6-7/8" hole center to ball center Ball End Angle to Shaft: 14° Sector Shaft Bearing Clearance: .001"-.002" 2-Tooth Steering Gear Specifications Turning Radius: 17' (34' diameter) Steering Gear Ratio: 1930-31, 13:1 Steering Wheel Diameter: 1930-31, 17" Pitman Arm Length: 6-7/8" hole center to ball center Ball End Angle to Shaft: 14° Sector Shaft Bearing Clearance: .001"-.002" 2-Tooth Steering Gear Housing Casting Markings DatesGemmerFordFebruary - May 1929“GEMMER” & “PAT. PDG.” in raised lettersRaised “F” on the sideFebruary - May 1929“GEMMER” & “PAT. PENDING” in indented lettersRaised “F” on the sideApril 1929 - Mid 1930“GEMMER” & “PATENTED” in indented lettersRaised “F” on the sideJanuary 1930 - EndNo IDIndented “A-3550-C” on the engine sideJanuary 1930 - EndNo IDIndented “A-3550-C” on the engine side & raised 5/16" or 9/16" letter “F” on the other side EXCEPT FOR MINOR MACHINING DIFFERENCES, ALL THE ABOVE HOUSINGS ARE VIRTUALLY IDENTICAL MECHANICALLY & ALL NEW PARTS FURNISHED WILL FIT EACH ONE. Ford & Gemmer were the two manufacturers of the 2-tooth steering box. All parts are interchangeable, except the worm gear, 2 races & 2 bearings. The Ford box has a large “F” on the outside where the worms are located. This change was made in December of 1930 (See page 518 Service Bulletins). The Ford box used a #9 roller bearing, while the Gemmer box used a #13 roller bearing. This also changes the taper on the bearings & races. The only parts available today are for the Gemmer box; therefore, if you have the Ford box with #9 roller bearings & it becomes necessary to change any of the 5 parts, then you must convert to all 5 of the Gemmer components (A3524CD, (2) BB3571, A3553D, BB3552) 600W Oil Usage Specifications Transmission: 1 pint Rear End: 1-1/2 Quarts 7-tooth Steering Box: 7-3/4 ounces 2-tooth Steering Box: 4-1/2 ounces Rear Axle Specifications Type: Three quarter floating Material: Special Ford carbon manganese steel Gear Ratio: 3.78:1 (34-9) Early 1928: 3.7:1 (37-10) Trucks: 4.11:1 (37-9) 1928-29 Roadsters: 3.54:1 (39-11) Pinion Bearing Cup: Double taper roller type B4616 Bearing Cup: B4222 Differential Bearing: B4221 Ring Gear: 8.4" pitch diameter, 1-3/16" wide teeth Axle Shaft: 1-1/8" diameter, 1.128"-1.130" Dimension From Housing Flange to Bearing Shoulder: Before 1929-1.370"-1.372", After 1929-1.365"-1.367" ID of Wheel Hub: 3.188"-3.190": max. wear 3.185" Axle & Drive Shaft Seal: B4245 Inner Axle Seal: B4245 Differential Lubricant: 600W New Bearing Torque: 20 foot pounds Bolt Torque: 35 foot pounds Axle Backlash: .010"-.015" Axle End Play: .015"-.020" Length of Full Spline: 2-1/2" Spline Minor Diameter: .901"-.911" Spline Outer Diameter: 1.090"-1.091" Pinion Bearing Torque: 15-20 foot pounds Front Spring Specifications Material: Chromium steel alloy Front Spring Leaf Width: 1-3/4" Front Spring Free Length: 30-13/16" to 30-15/16" Leaf Thickness: 1-31/32" to 2-1/16" Spring Off Car- Height from Top to Bottom as Sitting on Floor: 6-15/16" to 7-1/16" Spring Off Car- Center of Eye to Eye: 30-5/8" to 30-13/16" FORD BLUEPRINTS CALLED FOR EACH LEAF TO BE COATED WITH A THICK PASTE OF GRAPHITE GROUND IN OIL. Rear Spring Specifications Material Chromium steel alloy Rear Spring Leaf Width 2-1/4" Rear Spring Free Length Tudor & Fordor: 38-7/8" to 39" Roadster & Coupes: 38-7/8" to 39-1/2" FORD BLUEPRINTS CALLED FOR EACH LEAF TO BE COATED WITH A THICK PASTE OF GRAPHITE GROUND IN OIL. Cylinder Head Specifications 1928 Head: 4.3:1 compression ratio, 47.3 HP, 242cc displacement. Compression in individual cylinders: 80, 85, 83, 82 PSI 1930 Head: 4.1:1 compression ratio, 44.3 HP, 258cc displacement. Compression in individual cylinders: 77, 79, 82, 79 PSI Normal Listed Compression: A6050A, 75 pounds; A6050B, 110 pounds; B6050, 90 pounds Head Nut Torque: 50 foot pounds Engine Specifications Rated Horsepower: 24.03 SAE Brake Horsepower: 40 HP at 2200 rpm (Model AF 28 at 2000 rpm) Firing Order: 1-2-4-3 Compression Ratio: 4.11:1 Compression Pressure:: A6050A head, 76 PSI A6050B head, 110 PSI B6050 head, 90 PSI Piston Displacement: 200.5 cubic inches Bore: 3.876" (Model AF: 3.050") Stroke: 4.250" Torque: 128 foot pounds at 1000 rpm Cylinder Offset from Crankshaft Centerline: 1/8" Crankshaft to Camshaft Centerline: 4.155" Piston Specifications Displacement 200.5 cubic inches Material Aluminum Weight 1 lb. 1-7/8 oz. (476.8 grams) Variance in Weight of Pistons +/- 2 grams Weight with Rings Installed 1 lb. 4-1/2 oz. (581.2 grams) Weight with Rings & Pin 1 lb. 8-3/4 oz. (701.7 grams) Diameter 3.8745" (Bore 3.875") Length 3-29/32" Piston Skirt .001: small on the top than on the bottom of the skirt Piston Pin Hole .9996" to .9998" diameter Piston Pin Diameter 1.0001" to 1.0004" Pin Length 3.536" to 3.546" Compression Height (Top of piston to pin centerline) 1-29/32" Variation in Piston Compression Height .003" to .005" Piston Pin Bushing ID .992", OD 1.0675" Length 1.593" Pin Fit in Rod Bushing .0003" max Pin Fit in Piston .0002" to .0005" shrink fit Pin Bore Parallel to Head of Piston +/- .001" Piston Fit in Cylinder .002" max Piston Ring Specifications Ring Diameter: Same as piston, 3.875" stock Ring Groove: Depth, 7/32", Width - Upper 2, 1/8" Lower, 5/32" Ring Taper: .001"- narrower at the top than the bottom Ring Clearance in Groove: .001" to .002" Ring End Gap: Top .012" to .015"; Middle .010" to .012"; Lower .008" to .010" ALL PISTON RING SETS ARE US MADE GRANT OR HASTINGS BRANDS WITH 3 RINGS. THE GAP OF THE RINGS MUST NOT LINE UP, MAC'S SUGGESTS KEEPING THEM ABOUT A 1/4 TURN FROM EACH OTHER. Connecting Rod Specifications Material: Steel forging Weight: 1 lb, 6 oz. Balance Weight: 552 grams +/- 1 gram, crank end 198 grams +/- 1 gram, pin end Length: 7-1/2" center to center Crankshaft Bearing: 1-1/2" diameter, 1-5/8" wide Piston Pin Bearing: 1" diameter, 1-5/8" wide Bearing Side Clearance: .008" to .012" Pin Side Clearance: .040" to .053" between pin bosses Piston Pin Clearance: .0005" Crankshaft Clearance: .001" Bearing Cap Bolt Torque: 40-50 foot pounds. Connecting rod is assembled with oil dippers toward camshaft. Camshaft Specifications Shaft Diameter: 7/8" Bearing Diameter: 1.560" Block Bore Diameter: 1.561" Bearing Clearance: (Max.) .003" Bearing Length: Front, 1-3/4"; Center, 2"; Rear, 1"; 4th (1928), 7/8" Lift of Cam: .030" (Model B: .339" exhaust; .334" intake) Duration: 236º Lobe Center Angle: 113-1/2º End Play Spring Tension: Approximately 35 pounds Timing Gear Mounting Flange: 2-5/16" diameter, 5/16" thick Camshaft Material: Special Ford carbon manganese steel Cam Shaft Gear: Bakelized material Number of Gear Teeth: 50 Camshaft Gear Type: Spiral teeth Gear Backlash: .003" to .005" Gear Rotation Speed: 1/2 of crankshaft Camshaft Straightness: .0005" to .001" Variation in Eccentricity of Pitch Diameter of Gear Teeth: .0015" Variation in Maintaining Center Distance of Mating Gears +/-: .001" Gear Tolerances in Regular Spacing of Teeth: 0.0" Crankshaft Specifications Material: Ford carbon manganese steel Weight: 28 pounds Length: 26" Diameter: 1.624" main bearings; 1.499" crank pins Length of Main Bearings: Front & Center, 2"; Rear 3" Length of Crank Pins: 1-5/8" Crank Pin Taper & Roundness: .0005" to .001" Total Main Bearing Surface: 11-1/2 square inches Rear Flange Thickness: 3/8" Crankshaft Gear: 25 spiral teeth End Clearance: .004" to .007" Main Bearing Clearance: .001" Crankshaft Straightness: .0005" to .001" Main Bearing Cap Torque: 80-100 foot pounds Distance from Top Surface of Front Cross Member to Crankshaft Centerline: 2-33/64" Flywheel Specifications Weight: 63 lbs., 4 oz. (Model B 52 to 55 lbs.) Balance: Within 15 in./oz. Ring Gear Shoulder Diameter: 12.470" Ring Gear Outside Diameter: 14.2" Number of Ring Gear Teeth: 112 Ring Gear to Starter Drive Ratio: 11.2: 1 Flywheel Bolt Torque: 65 foot pounds Pilot bearing hole is concentric with crankshaft flange shoulder within .002" TIR (Total Indicator Reading). Clutch mounting surface & clutch disc surface must run true to crankshaft within .005" TIR (Total Indicator Reading). Clutch mounting shoulder diameter must be concentric with crankshaft flange diameter within .005" TIR (Total Indicator Reading). Flywheels provide momentum to keep the crankshaft spinning. As the flywheel spins faster, a vibration will occur if it’s out of balance. It’s best to have your flywheel, with clutch & pressure plate, balanced so that when you place in the clutch disc & reinstall the pressure plate it will retain balance. Valve Specifications Lift .287" with .015" clearance Seat Angle 45º Seat Width 3.32" Stem Diameter .311" Valve Length 5.677" Head Diameter 1.537" Valve Opening Diameter 1-3/8" Port Diameter 1-3/8" Clearance, Exhaust Valves in Guides .002" Clearance, Intake Valves in Guides .001" to .0015" Valve Lifter Clearance .010" to .013" Lifter Diameter Clearance .0015" Valve Guides .3135" ID; .5938" OD; length 2.125" (early 2.375") Valve Spring 1.022" OD; free length 2-15/16"; comp. length 2-1/14" (57-64 lbs.); tension (closed) 34 to 38 lbs. Valve Lifter A6500A (used with A camshaft), length 2.486"; head diameter 1.117". Valve Timing Intake opens 7-1/2º before Top Dead Center; closes 48-1/2º after Bottom Dead Center. Exhaust opens 51-1/2º before Bottom Dead Center; closes 4-1/2º after Top Dead Center.