Model T Specifications

Tire Tread Images Tire Pressure Recommendations Piston Specifications Magneto Coil Assembly Identification Table Fan Belt Specifications Fan Specifications Engine Specifications Crankshaft Specifications Camshaft Specifications Cam Specifications Cylinder Specifications Manifold Port Specifications Oil Usage Push Rod Specifications Valve Specifications Rear Spring Specifications Front Spring Specifications Shackle Bushing Specifications Steering Specifications Throttle Specifications Spark Specifications Brake Specifications Universal Ball Cap Specifications Triple Gear Pin Dimensions Controller Quadrant Teeth Specifications Transmission Specifications Clutch Specifications Coil Box Specifications Muffler Specifications Starter Crank Specifications Oil Pan & Tube Specifications Universal Joint Shank Specifications Front Fender Specifications Crossmember Specifications Radius Rod Ball & Socket Specifications Front & Rear Hub Specifications Drag Link & Tie Rod Specifications Front Axle Specifications Roadster (Runabout) - Open Car - folding top, no side windows, front seat only. Ford Model T Coupe Coupe - Closed Car - two doors, enclosed interior with front seats only, side glass windows. Ford Model T Tudor Sedan Tudor Sedan - Closed Car - two doors, enclosed interior with front and rear seats, side glass windows. Ford Model T Fordor Sedan Fordor Sedan - Closed Car - four doors, enclosed interior with front and rear seats, side glass windows. Ford Model T Touring Touring - Open Car - folding top, no side windows, front and rear seats. Ford Model T Center Door Sedan Centerdoor Sedan - Closed Car - enclosed interior with front and rear seats, side glass windows, door positioned in the center of the body. Ford Model TT Truck TT Truck - enclosed interior, adaptable chassis/rear cargo area, worm drive rear axle ) Ford Model T Roadster Pickup Roadster Pickup - Open Car - no side windows, front seat only, rear bed for cargo. Ford Model T C Cab Truck "C" Cab Truck - distinctive C shape of side windows. Engine Serial Numbers US Year Serial Number 1908 1-309 1909310-14,161191014,162-34,9001911 34,901-88,900 191288,901-183,5631913183,564-408,3471914408,348-656,0631915656,064-1,028,31319161,028,314-1,614,51619171,614,517-2,449,17919182,449,180-2,831,42619192,831,427-3,659,97119203,659,972-4,698,41919214,698,420-5,638,07119225,638,072-6,953,07119236,953,072-9,008,37119249,008,372-10,994,033192510,994,034-12,990,076192612,990,077-14,619,254192714,619,255-15,076,231 Engine Serial Numbers Canada Year Serial Number 5/20/13C-17/31/13C-1,5007/31/14C-16,5007/31/15C-37,5007/31/16C-70,0007/31/17C-121,0007/31/18C-170,0007/31/19C-208,5007/31/20C-262,5007/31/21C-311,3007/31/22C-357,2007/31/23C-427,3007/31/24C-513,4057/31/25C-583,3007/31/27C-750,000 Prior to 5/20/13, Canadian cars used US production engines, they did not say "MADE IN USA". Tire Tread Images Recommended Tire Pressures Under-inflation can result in rim cuts, even on the best of rims. Recommended tire pressures are: Tire SizeInflation PressureRim Diameter30 x 3"55-65 psi23"30 x 3-1/2"55-65 psi24"450 x 21"32 psi21"500 x 23"60 psi32"600 x 20"36-60 psi30" Piston Specifications Cylinder Bores: 3.750" Diameter 6.752" Long Diameter: Skirt 3.748" 3.749" 2nd Ring 3.743" 3.745" Top 3.738" 3.740" Ring Grooves 1/4" x 13/64" Deep Pin Bushing Diameter .740" .741" Wrist Pin Diameter .740" .741" Wrist Pin Length 3-1/2" Ring Gaps (original rings) 3.750" Top .003" Center .005" Bottom .008" When installing any type of piston, the split in the skirt faces away from the camshaft. Magneto Coil Assembly Identification Table YearSpoolRemovable Spool PoleMagneto Rung MaterialCopper WidthFor Use With Magnet ThicknessUsageMAC's Part NumberNotes1909Double stack roundYesCast Iron3/8" each stack1/2"First 17500 carsT3250ESSpecial order1910Double stack roundYesCast Iron1/4" each stack9/16"17501 to 20500T3250ESSpecial order1910-12Double stack roundYesStamped steel1/4" each stack5/8"2 flat sides on pole plateT3250ESSpecial order1913-14Double stack roundNoCast Iron1/4" each stack5/8"Beginning by October 1914T3250ESSpecial order1915 17Double stack ovalNoCast Iron1/4" each stack3/4"Without starter notchT3250DEStock1917 18Single stack ovalNoCast Iron1/4"3/4"Without starter notchT3250DLStock1919 27Single stack ovalNoCast Iron3/16"3/4"With starter notchT3250DSStock Fan Belt Specifications The following are the most common fan belt lengths for T3900WP & T3900WPL. However, modified upper & lower pulleys can affect which belt is needed. Check your belt with a measured string before ordering. YearsBelt LengthYearsBelt LengthFOR T3900WPFOR T3900WPL09-1631"09-1628-1/4"17-2532"17-1931"26-2736"20-2532" 26-2733-3/4" MAC's offers three kinds of fan belts: plain rubber, plain rubber with “Ford� script & plain leather. Rubber Fan Belts: Close to the original, with heavy-duty 5-ply reddish-tan rubber material. All are 1-1/8" wide with a glued, overlapping lamination joint. Leather Fan Belts: Not original, but they are very durable. They might stretch, so are made slightly undersize. They are stitched at the joint & around the circumference. Fan Specifications Drive pulley ID: 1.83"-1.84" Drive pulley OD: 3" Prior to 1920. Hub ID: .499"-.500" Prior to 1920. Engine Specifications 22.50 horsepower Spark plug firing order: 1-2-4-3. 1 is on the radiator side of the engine. Spark Plug Gap: .030" Crankshaft Specifications Overall length 22-5/32" Connecting rod bearing diameters (all) 1.248" Bearing lengths Front 2" Center 2-3/16" Rear 3-1/8" Rods 1.505" Main Bearings 1.248-1.249" Camshaft Specifications Overall length: 22-23/32" Bearing diameters (all) .748" Bearing lengths:Front 1.967" Center 2-7/16" Rear 1.750" Width of cams: 7/8" Heel cam diameter: 13/16" Greatest diameter of cam: 1-1/16" Flange diameter: 1-3/4" Flange width: 1/4" Dowel holes: .3120-.3125" Thread: Large 13/16 x 16 USF Small 9/16 x 18 SAE Camshaft Bearing Holes Front 1.374-1.375" Center 1.372-1.373" Rear .9985-1.000" Cam Specifications Bearing (center) ID: .7496"-.7500" Bearing (center) OD: 1.369"-1.370" Bearing (front) ID: .7496"-.7500" Bearing (front) OD: 1.372"-1.373" Shaft journal OD: .7488"-.7491" Cylinder Specifications Cylinder Bores: 3.750" diameter 6.752" long Cylinder Head Bolt Holes: 7/16" x 14 Manifold Port Specifications (With 1-1/4" countersink, 1/8" deep) 1-1/8" Oil Usage Specifications Engine: (4-5 quart capacity) 30 non-detergent Rear end: (1 to 1-1/2 quart capacity) 600W Push Rod Specifications Length: 2-11/32" Diameter: .4355"-.4365" Head diameter: 1" Guide holes: .437" Valve Specifications Diameter of head & upper edge of seat: 1-17/64"-1-9/32" Diameter of lower edge: 3/32" Angle of valve seat: 45° Thickness of head: 3/16" Stem diameter: .3105"-.312" Overall length: 4.974"+ Retainer pin hole: .110"-.113" 4-19/32" from valve seat line Lift: 7/32" Tappet to stem clearance: .022"-.032" Valve ports: 1-5/16" Stem guide holes: .3125" Rear Spring Specifications Main leaf length: 45-1/4" Main leaf height: 10-1/2" 2nd leaf length: 43-3/8" 3rd leaf length: 36-9/16" 4th leaf length: 30-3/8" 5th leaf length 24-7/8" 6th leaf length 19-3/4" 7th leaf length 15-1/16" 8th leaf length 12-3/9" Leaves 3-8 are clip type. Front Spring Specifications Fully assembled length (tapered style): 31-1/4" to 31-3/8" Height: 3-3/8 to 3-1/2" For early type perch, shackle bore & wishbone bore are parallel to each other, 1-7/16" apart. Perch center line distance: 1-7/16" Perch camber: 4° 30' Changed to 5° 30' during the 1920s. Shackle Bushings Specifications Front, OD: .686"-.687" Front, ID:.563"-.565" Rear, OD .748"-.750" Rear, ID .587" Steering Specifications Steering arm ball diameter: 1-1/8" Steering arm length: 4-1/4" overall Steering gear cover opening: .937"-.938" Steering cover retaining bolt: #6 x 32 (ASME) 5/16" deep Steering ball arm to frame support clearance: 1/8" Steering main shaft to frame support angle: 41° 26' Steering column flange to center shaft angle: 39°45' Steering tube opening at dash: .752"-.756" Steering gear housing shaft opening: .780"-.781" Throttle Specifications Lever to throttle arm angle: 45° Locates throttle on arm shaft. Arm length: 1-3/8" Spark Specifications Lever to spark arm angle: 111° Locates spark arm on shaft. Arm bend angle: 46° Bent towards front of car. Brake Specifications The brake rod has 2 bends; one 1-7/16" from clevis end & the other 2-3/4" from the threaded end (excluding bends for clearance of radius rod). Rod pin OD: .316" Pull rod pin hole diameter: .316" Rod length: 54-1/4" Center of clevis to end of rod. Drum lug width: 1/2" Univeral Ball Cap Specifications Inner diameter for output shaft: 1.566"-1.567" Babbitt in place. Triple Gear Pin Specifications At gear: .6770"-.6775" In flywheel: .6790"-.6800" At end: .6860"-.6870" Flywheel Hole for Triple Gear Pin: .6750" Controller Quadrant Teeth Specifications 3/32" deep x 5/32" wide Transmission Specifications Drive plate clutch finger screw holes: 13/32" Changed in the 1920s. Clutch drum shaft mounting hole ID: .9980"-.9985" Clutch drum shaft lug opening: 1/2" Band with lining ID: 7-1/2" Transmission driven gear ID: 1-15/32-1-1/2" Push ring thickness: 9/16" Main shaft diameter: 1-5/32" Clutch Specifications Release fork (hole for collar) size: .373"-.375" Lever shaft OD: .624"-.626" Fork push ring width at fork area: .403"-.409" Finger mounting pin hole diameter: .346"-.348" Holes in drive plate: 3. Coil Box Specifications Width:3-5/16" Length: 8-9/16" Muffler Specifications Inlet ID: 1-33/64" Cast iron muffler. Tailpipe length: 10-3/4" Exposed length, cast iron muffler. Starter Crank Specifications Sleeve ID: .755"-.757" Sleeve OD: .992"-.966" Ratchet ID: .749"-.751" Ratchet pin hole: .310" Crank Case Trunnion with Cap ID Front spring hanger:1.498"-1.500" Oil Pan & Tube Specifications Pan arm upper mounting hole distance: 21.5" to center Pan rear flange to center of pan arm: 12-9/32" Pan arm width at frame opening: 9-7/8" (x2) from center line of pan to edge of pan arm at lower bolt holes Pan front (trunnion) bearing: OD: 1.494"-1.496" ID: .999"-1.000" Width: 1.000"-1.002" Oil tube ID: 9/32" Universal Joint Shank Specifications Universal Joint Shank: .873"-.875" Outer Diameter Universal Joint Ring Inner Diameter: .999"-1.000" Front Fender Specifications Front Fender Iron Angle: 49° 40' Circa 1914. Crossmember Specifications Front Crossmember Overall Length: 22-3/4" Length: 21.5" to center of fender iron mounting holes Radius Rod Ball & Socket Specifications Ball OD: 1.248"-1.250" Socket ID: 1-1/4" Front & Rear Hub Specifications Front hub ID for small bearing race: 1.9335"-1.9365" Front hub ID for large bearing race: 2.715"-2.716" Rear hub opening at wide end: 1-1/16" Taper angle: 1-1/2" per foot Rear hub brake drum ID: 8" Drag Link & Tie Rod Specifications Drag link ball socket radius: 19/32" Tie rod yoke ID: (upper end) .562"-.563" Tie rod ball OD: 1-3/32" Front Axle Specifications Yoke opening for spindle body: 4.748"-4.752" Bore for spindle bolt (kingpin): 5.045"-.505" for first 5/16" of lower yoke, then 1/2" x 20 SAE threads to end Spindle body length: 4.748"-4.750" (end size) Width of yoke (upper): .685"-.690" Width of yoke (lower): .685"-.690"