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Model T Identification

Model T Vehicle Identification

Engine Serial Numbers (US)

Engine Serial Numbers (CA)

MAC's DISCLAIMER:

The content MAC's presents on its "Vehicle Identification & Specification" pages & in its catalogs is for information use only and is intended to be used as a guide. While MAC's makes every effort to ensure accurate content, occasionally errors may occur. MAC's does not take responsibility & will not be held liable for any automotive parts purchases, repairs or restoration decisions made as a result of information presented here or anywhere in its catalogs.

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

Vehicle Identification

Ford Model T Runabout
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
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
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Tire Tread Images
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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"
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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.
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Magneto Coil Assembly Identification Table

Year Spool Removable
Spool Pole		 Magneto Rung Material Copper Width For Use With
Magnet Thickness		 Usage MAC's
Part Number		 Notes
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
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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"

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.
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Fan Specifications

Drive pulley ID 1.83"-1.84"

Drive pulley OD 3"
Prior to 1920.

Hub ID .499"-.500"
Prior to 1920.
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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"
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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"
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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"
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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"
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Cylinder Specifications

Cylinder Bores 3.750" diameter 6.752" long

Cylinder Head Bolt Holes 7/16" x 14
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Manifold Port Specifications

(With 1-1/4" countersink, 1/8" deep) 1-1/8"
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Oil Usage Specifications

Engine (4-5 quart capacity) 30 non-detergent

Rear end (1 to 1-1/2 quart capacity) 600W
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Push Rod Specifications

Length 2-11/32"

Diameter .4355"-.4365"

Head diameter 1"

Guide holes .437"
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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"
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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.
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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.
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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"
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Throttle Specifications

Lever to throttle arm angle 45°
Locates throttle on arm shaft.

Arm length 1-3/8"
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Spark Specifications

Lever to spark arm angle 111°
Locates spark arm on shaft.

Arm bend angle 46°
Bent towards front of car.
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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"
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Univeral Ball Cap Specifications

Inner diameter for output shaft 1.566"-1.567"
Babbitt in place.
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Triple Gear Pin Specifications

At gear .6770"-.6775"

In flywheel .6790"-.6800"

At end .6860"-.6870"

Flywheel Hole for Triple Gear Pin .6750"
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Controller Quadrant Teeth Specifications

3/32" deep x 5/32" wide
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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"
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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.
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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.
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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"
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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"


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Universal Joint Shank Specifications

Universal Joint Shank .873"-.875"

Outer Diameter Universal Joint Ring Inner Diameter
.999"-1.000"
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Front Fender Specifications

Front Fender Iron Angle 49° 40'
Circa 1914.
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Crossmember Specifications

Front Crossmember Overall length 22-3/4"

Length 21.5" to center of fender iron mounting holes
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Radius Rod Ball & Socket Specifications

Ball OD 1.248"-1.250"

Socket ID 1-1/4"
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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"
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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"
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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"
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MAC's DISCLAIMER:

The content MAC's presents on its "Vehicle Identification & Specification" pages & in its catalogs is for information use only and is intended to be used as a guide. While MAC's makes every effort to ensure accurate content, occasionally errors may occur. MAC's does not take responsibility & will not be held liable for any automotive parts purchases, repairs or restoration decisions made as a result of information presented here or anywhere in its catalogs.