| Ford Model T Technical Specifications |
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3~ Tudor's & 1~ Coupe
Henry Ford said,
"It's all nuts and bolts"
"Start by doing what's necessary; then do what's possible; and suddenly you are doing the impossible."
Mitch's Auto Service ctr -
Vehicle Identification 
Roadster (Runabout) - Open Car - folding top, no side windows, front seat only.
Coupe - Closed Car - two doors, enclosed interior with front seats only, side glass windows.
Tudor Sedan - Closed Car - two doors, enclosed interior with front and rear seats, side glass windows.
Fordor Sedan - Closed Car - four doors, enclosed interior with front and rear seats, side glass windows.
Touring - Open Car - folding top, no side windows, front and rear seats.
Centerdoor Sedan - Closed Car - enclosed interior with front and rear seats, side glass windows, door positioned in the center of the body.
TT Truck - enclosed interior, adaptable chassis/rear cargo area, worm drive rear axle )
Roadster Pickup - Open Car - no side windows, front seat only, rear bed for cargo.
"C" Cab Truck - distinctive C shape of side windows.Engine Serial Numbers US Year Serial Number 1908 1-309 1909 310-14,161 1910 14,162-34,900 1911 34,901-88,900 1912 88,901-183,563 1913 183,564-408,347 1914 408,348-656,063 1915 656,064-1,028,313 1916 1,028,314-1,614,516 1917 1,614,517-2,449,179 1918 2,449,180-2,831,426 1919 2,831,427-3,659,971 1920 3,659,972-4,698,419 1921 4,698,420-5,638,071 1922 5,638,072-6,953,071 1923 6,953,072-9,008,371 1924 9,008,372-10,994,033 1925 10,994,034-12,990,076 1926 12,990,077-14,619,254 1927 14,619,255-15,076,231 Engine Serial Numbers Canada
Prior to 5/20/13, Canadian cars used US production engines, they did not say "MADE IN USA".Year Serial Number 5/20/13 C-1 7/31/13 C-1,500 7/31/14 C-16,500 7/31/15 C-37,500 7/31/16 C-70,000 7/31/17 C-121,000 7/31/18 C-170,000 7/31/19 C-208,500 7/31/20 C-262,500 7/31/21 C-311,300 7/31/22 C-357,200 7/31/23 C-427,300 7/31/24 C-513,405 7/31/25 C-583,300 7/31/27 C-750,000 ( Back to Top ) Tire Tread Images 
( Back to Top ) Recommended Tire Pressures
Under-inflation can result in rim cuts, even on the best of rims. Recommended tire pressures are:Tire Size Inflation Pressure Rim Diameter 30 x 3" 55-65 psi 23" 30 x 3-1/2" 55-65 psi 24" 450 x 21" 32 psi 21" 500 x 23" 60 psi 32" 600 x 20" 36-60 psi 30" ( Back to Top ) 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.( Back to Top ) Magneto Coil Assembly Identification Table
Year Spool Removable
Spool PoleMagneto Rung Material Copper Width For Use With
Magnet ThicknessUsage MAC's
Part NumberNotes 1909 Double stack round Yes Cast Iron 3/8" each stack 1/2" First 17500 cars T3250ES Special order 1910 Double stack round Yes Cast Iron 1/4" each stack 9/16" 17501 to 20500 T3250ES Special order 1910-12 Double stack round Yes Stamped steel 1/4" each stack 5/8" 2 flat sides on pole plate T3250ES Special order 1913 14 Double stack round No Cast Iron 1/4" each stack 5/8" Beginning by October 1914 T3250ES Special order 1915 17 Double stack oval No Cast Iron 1/4" each stack 3/4" Without starter notch T3250DE Stock 1917 18 Single stack oval No Cast Iron 1/4" 3/4" Without starter notch T3250DL Stock 1919 27 Single stack oval No Cast Iron 3/16" 3/4" With starter notch T3250DS Stock 
( Back to Top ) 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.Years Belt Length Years Belt Length FOR T3900WP FOR T3900WPL 09-16 31" 09-16 28-1/4" 17-25 32" 17-19 31" 26-27 36" 20-25 32" 26-27 33-3/4"
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.( Back to Top ) Fan Specifications
Drive pulley ID 1.83"-1.84"
Drive pulley OD 3"
Prior to 1920.
Hub ID .499"-.500"
Prior to 1920.( Back to Top ) 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"( Back to Top ) 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"( Back to Top ) Camshaft Specifications
Overall length 22-23/32" Bearing diameters (all) .748"
Bearing lengthsFront 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"( Back to Top ) 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"( Back to Top ) Cylinder Specifications
Cylinder Bores 3.750" diameter 6.752" long
Cylinder Head Bolt Holes 7/16" x 14( Back to Top ) Manifold Port Specifications
(With 1-1/4" countersink, 1/8" deep) 1-1/8"( Back to Top ) Oil Usage Specifications
Engine (4-5 quart capacity) 30 non-detergent
Rear end (1 to 1-1/2 quart capacity) 600W( Back to Top ) Push Rod Specifications
Length 2-11/32"
Diameter .4355"-.4365"
Head diameter 1"
Guide holes .437"( Back to Top ) 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"( Back to Top ) 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. ( Back to Top ) 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.( Back to Top ) Shackle Bushings Specifications
Front, OD .686"-.687"
Front, ID .563"-.565"Rear, OD .748"-.750"
Rear, ID .587"( Back to Top ) 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"( Back to Top ) Throttle Specifications
Lever to throttle arm angle 45°
Locates throttle on arm shaft.
Arm length 1-3/8"( Back to Top ) Spark Specifications
Lever to spark arm angle 111°
Locates spark arm on shaft.
Arm bend angle 46°
Bent towards front of car.( Back to Top ) 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"( Back to Top ) Univeral Ball Cap Specifications
Inner diameter for output shaft 1.566"-1.567"
Babbitt in place.( Back to Top ) Triple Gear Pin Specifications
At gear .6770"-.6775"
In flywheel .6790"-.6800"
At end .6860"-.6870"
Flywheel Hole for Triple Gear Pin .6750"( Back to Top ) Controller Quadrant Teeth Specifications
3/32" deep x 5/32" wide( Back to Top ) 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"( Back to Top ) 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.( Back to Top ) Coil Box Specifications
Width 3-5/16"
Length 8-9/16"( Back to Top ) Muffler Specifications
Inlet ID 1-33/64"
Cast iron muffler.
Tailpipe length 10-3/4"
Exposed length, cast iron muffler.( Back to Top ) 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"( Back to Top ) 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 holesPan front (trunnion) bearing: OD 1.494"-1.496"
ID .999"-1.000"Width 1.000"-1.002"
Oil tube ID 9/32"( Back to Top ) Universal Joint Shank Specifications
Universal Joint Shank .873"-.875"
Outer Diameter Universal Joint Ring Inner Diameter
.999"-1.000"( Back to Top ) Front Fender Specifications
Front Fender Iron Angle 49° 40'
Circa 1914.( Back to Top ) Crossmember Specifications
Front Crossmember Overall length 22-3/4"
Length 21.5" to center of fender iron mounting holes( Back to Top ) Radius Rod Ball & Socket Specifications
Ball OD 1.248"-1.250"
Socket ID 1-1/4"( Back to Top ) 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"( Back to Top ) 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"( Back to Top ) 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"3~ Tudor's & 1~ Coupe
Henry Ford said,
"It's all nuts and bolts"
"Start by doing what's necessary; then do what's possible; and suddenly you are doing the impossible."
Mitch's Auto Service ctr -
I do not know where you found this but that is outstanding.Comment
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Very nice and will be a big help to me.Comment
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Do you have a model T George?Comment
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