Model T Identification
Model T Vehicle Identification
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.
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.
Year
Serial Number
1908
1-309
34,901-88,900
Year
Serial Number
Prior to 5/20/13, Canadian cars used US production engines, they did not say "MADE IN USA".
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Recommended Tire Pressures
Under-inflation can result in rim cuts, even on the best of rims. Recommended tire pressures are:
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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
Spool Pole
Magnet Thickness
Part Number
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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.
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
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"
Triple Gear Pin Specifications
At gear: .6770"-.6775"
In flywheel: .6790"-.6800"
At end: .6860"-.6870"
Flywheel Hole for Triple Gear Pin: .6750"
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.
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"
Crossmember Specifications
Front Crossmember Overall Length: 22-3/4"
Length: 21.5" to center of fender iron mounting holes
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"
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.