Model A Parts & Auto Accessories

                 USA FORD MODEL A MECHANICAL SPECIFICATIONS
Camshaft bearing clearance .001 to .003
Cooling system 3 gal
Compression 76 PSI gauge
Connecting rod to crankshaft clearance .001 to .003
Crankshaft bearing size 1.500 less 1 to 2 thousands for oil (1.498/1.499)
กก 1.625 less 1 to 2 thousands for oil ( 1.623/1.64, subtract .010 or .020 or .030 for rods)
Crankshaft end play .004
Differential 2-1/4 Pints
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
Firing Order 1,2,4,3
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.
Oil Pressure  2 to 3 pounds depending on weight of oil
Piston to cylinders .002
Piston ring gap - lower ring .008 to .010
Piston ring gap - centre ring .010 t0 .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 oz. 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.

Axle housing to differential 35
Camshaft nut 100
Connecting rods 45
Cylinder Compression on NEW engine 64
-The cylinders should not vary more than 7 pounds between cylinders.
Flywheel 55
Head 50-55
-Torque up in three stages using correct sequence with final torque after engine is hot.
Main bearing cap bolts 70 - 80
Manifold - exhaust 30 - 35
Oil pan 15 -25
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
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