Serving the Model A Restorer Since 1976

Specifications

Ford Model A Specifications

Camshaft bearing clearance .001 to .003
Cooling system 3 gal.
Connecting rod to crankshaft clearnace .001 to .00336
Crank rod pins 1.500 less 1 to 2 thousands for oil (1.498/1.499)
Crankshaft bearing size 1.625 less 1 to 2 thousands for oil (1.623/1.624, subtract .010 or .020 or .030 for rods)
Crankshaft end play .004
Distributor point gap .018 to .022
End play of water pump shaft .006 to .010
Engine compression 76 PSI at sea level; at 5,000 ft. deduct 20
Flywheel depth 1.123 distance from 12 hold surface to refinish surface
Gas tank 1928-29 10 gal.
Gas tank 1930-31 11 gal
Oil 5 qts. But only 4 1/2 will come out with an oil change.
Oil Pressure 2 - 3 lbs. depending on the weight of the oil
Piston to cylinders .002
Piston ring gap - lower ring .008 to .010
Piston ring gap - center ring .010 to .012
Piston ring gap - upper ring .012 to .015
Main bearing clearance .001 to .0015
Rear axle 1 1/2 pint
Rod wrist pin bushing - Machine shop must expand ID of bushing in rod before honing to .0003 or 4  
Spark plug gap .035
Steering gear 7 3/4 ox. for 7 tooth, 4 1/2 oz. for 2 tooth box
Transmission 1 pint
Timing gear backlash .004
Tire pressure 35 PSI
Valves in valve guides .001 to .0015
Valve to tappet clearance .010 to .012 for all valves

Torque measurements are in foot-pounds

The following is a guide for torquing the different fasteners. Remember, if original fasteners are used, their tension loss is unknown due to the number or times they have been reused. Therefore, the torque measurement might need to be adjusted. It is recommended to use all new fasteners. See Nuts and Bolts article in How to Restore Your Model A, Volume 3.

Axle housing to differential 35
Camshaft nut 100
Connecting rods 35
Crankshaft Pulley Nut 80
Cylinder Compression on NEW engine - The cylinders should not vary more than 7 pounds between cylinders 64
Flywheel 55
Head - Torque up in three stages using correct sequence with final torque after engine is hot. 50 - 55
Main bearing cap bolts 70 - 80
Mainfold - exhaust 25 - 30
Oil pan 5 - 6
Pressure plate - use grade 5 bolts 25
Rear axle shaft nut 100
Timing cover 25
Torque tube to differential 35
Valve cover 15 - 25
Water inlet 40
Water neck - torque with caution 50
Wheel lug nuts 50 - 55

What is Raven Finish? This is a dark dye mixed with oil. This is a temporary finish and will begin to rust within a few months after installing, unless it is sealed by spraying with a clear coat or painting black.