General Information about model L Lincolns
Lincoln Model L series (1920-1930)
Stewart-Warner vacuum tank fuel system (1 gallon size)
Carburetor: Stromberg plain tube type, 0-3
- 60 Degree V-8 (Vee Eight) Cylinder
- Separate cast iron cylinders bolted to aluminum crankcase
- 1920 - May 1927: 3 3/8 inches
- June 1927 – 1930: 3 1/2 inches
- Stroke: 5.000 inches
- Piston Displacement:
- 3 3/8 inch bore: 357.8 cubic inches, Horsepower: 36.4 S.A.E rating
- 3 1/2 inch bore: 384.7 cubic inches, Horsepower: 39.2 S.A.E rating
- Length of Connecting Rod: Center-to-Center is 12 1/2 inches.
- Connecting rod bearings:
- 2 inch in diameter and 2 1/2 inch in width
- The only connecting rods that have bearings are the Fork connecting rods
- The Blade connecting rods ride on the outside of the Fork connecting rod bearings
- Single (Blade) connecting rod diameter(large end): 2 5/8 inch
- Connecting rod bearings are bronze backed babbitt.
- Driver’s side lower connecting rod ends are forked and hold connecting rod bearing tightly. (Clearance between bearing and crankshaft is .0015-.002 inches).
- Passenger side lower connecting rods are blade (straight) and mount between Fork ends onto connecting rod bearing. (Clearance between Blade connecting rod and Fork connecting rod bearing is .003 inches). Reason for this 0.003 inch is that the bronze babbit bearing will expand more than the steel connecting rod.
- Pistons have expansion relief slit facing drivers side for all pistons.
- Piston pin: 7/8 inch diameter and 3 1/8 inch in length
- Compression Pressure: 85-90 lbs.
- Piston Rings: Three concentric rings at top of piston.
- Piston connecting rods are Fork & Blade arrangement
- Main crankshaft bearings are bronze backed babbitt.
- Crankshaft Bearing No. 1 front: Diameter: 2 inches, Length: 2 3/4 inches
- Crankshaft Bearing No. 2 intermediate: Diameter: 2 inches, Length: 1 1/2 inches
- Crankshaft Bearing No. 3 center: Diameter: 2 inches, Length: 2 1/4 inches
- Crankshaft Bearing No. 4 intermediate: Diameter: 2 inches, Length: 1 1/2 inches
- Crankshaft Bearing No. 5 rear: Diameter: 2 inches, Length: 3 1/2 inches
- Total length main bearing surface: 11 1/2 inches
- Valve clearance: intake: 0.003 inches, exhaust: 0.003 inches
- Valve lift: 5/16 inch
- Valve Diameter: 1 3/4 inch
- Valve Stems: 3/8 inch in diameter.
- Valve Seat: Angle 45 degrees.
- Lincoln manufactured water pump driven off accessory shaft
- Ignition System: Ignition, dual point system, Distributor: DELCO
- Spark Plugs: 7/8 inch (Champion C-16C or equivalent), gap: 0.025
- Firing Order:1-2-3-4-5-6-7-8
- Cylinder Numbering:
- Passenger side, front to back: 1 – 3 – 7 – 5
- Drivers side, front to back: 6 – 8 – 4 – 2
- Cooling System: 8 gallons
- Crankcase Oil: 10 quarts oil
- Transmission: 3 1/2 pints gear lubricant
- Differential: 6 1/2 pints gear lubricant
- Fuel tank: 20 gallons
- Vacuum tank: 1 gallon working capacity
- DELCO Starter-Generator, driven by water pump via a clutch
- Engine Color:
- 1920-1924 Light Grey.
- 1924-1930 Dark Grey (Dupont Centari paint chip #6334A or equivalent), cylinders, heads, intake manifold, carburetor riser, valve cover panels & knobs, water pump, steering box, firewall, vacuum tank, Purolator oil filter & brackets, oil pan, top tank of radiator, fan blades. Exception: Firewall maybe painted body color for custom bodies. See Engine Detail Page: Model L Engine Compartment
- Crankcase color: Silver varnish or paint: aluminum crankcase, oil pressure regulator, transmission housing, fan pulley and fan pulley hub. See Engine Detail Page: Model L Engine Compartment
- Engine compartment plated hardware: See Engine Detail Page: Model L Engine Compartment
Timken rear axle
Rear axle ratios
- 111 inch wheelbase frame (maybe used for service vehicle).
- 120 inch wheelbase frame (early years).
- 136 inch wheelbase frame (typical).
- 150 inch wheelbase frame on special models.
- Rails press formed.
- Cross members pressed into brackets.
- Fuel Tank: 20 gallon with 2 gallon switchable reserve.
- 1920-1924 gas gauge on drivers side of tank.
- 1924-1926 gas gauge on dashboard, mechanical-wire actuated.
- 1926-1930 gas gauge on dashboard, hydrostatic.
- Fuel Filter: Located on inside of drivers side frame rail near brake/clutch pedals.
- January 1930 steering thrust adjuster changed from five hole to slotted arrangement.
- January 1930 steering worm gear changed to have increased tolerances on ends and close tolerances in middle. Provides easier turning of wheel when driving into curves or turning onto another road.
Timken front axle
Houdaille fluid filled lever shock absorbers
Lincoln manufactured leaf springs
- Roadster (only) 4.23:1
- Sedans (most common) 4.58:1
- Limousines 4.90:1
- Limousines 5.09:1
Lincoln manufactured shackles and shackle pins.
- 11 leaves for rear axle, leaves are symetrical about the center.
- 12 leaves for rear axle on limousine models, leaves are symetrical about the center.
- 13 leaves for front axle, leaves are not symetrical about the center.
- 19 inches from front shackle to center.
- 20 inches from rear shackle to center.
Brakes: Mechanical brakes, pull rod type for all model L (1921-1930)
- Two (2) 0.090 inch shims between shackle and spring end.
- Reversible shackle pins (reverse when worn).
- January 1930 road shock dampener introduced on front shackle of drivers side leaf spring.
Body & Other Features
- 1920-1924 two wheel brakes.
- 1924-1926 six wheel brakes, emergency brake external to rear brake drum.
- 1927-1930 six wheel brakes, emergency brake internal to rear brake drum.
- January 1926 Greyhound hood ornament introduced on all models.
- March 1927 oval instrument cluster introduced into dashboard.
- October 1927 Purolator oil filter introduced, mounted on passenger side of firewall, possible to retrofit to earlier models.
- April 1928 coincidental steering wheel and ignition switch lock.
- May 1928 hydrostatic gas gauge introduced.
- May 1929 water temperature gauge included in instrument cluster.
- June 1929 Seth Thomas electric self winding clock introduced.
- 1928 threaded “cup style”
- 1929 hexagon chrome plated brass with oval logo fits inside drop center wheel.
- 1930 round chrome plated brass with oval logo fits inside drop center wheel.