Cadillac Service Repair Manuals


1971 Cadillac Coupe de Ville

1971 Cadillac Coupe de Ville

Model year production was curtailed by labor disputes and peaked at 188,537 units. The new models were introduced September 29, 1970. For the first time ever, Cadillac built cars outside of Detroit, Michigan. Some 1971 Coupe and Sedan DeVilles were built at a GM Assembly Division (GMAD) factory in Linden, New Jersey. Sales, for calendar 1971, hit a new high of 267,868 units. Hints of a forthcoming downsized Cadillac line were heard in Detroit.

1971 Cadillac Coupe de Ville

1971 Cadillac Coupe de Ville

For 1971, there were five models: Calais (two-door hardtop coupe and four-door hardtop sedan), DeVille (two-door coupe and four-door hardtop sedan), Fleetwood Sixty-Special (four-door brougham), Fleetwood Seventy-five (four-door sedan, four-door limousine, and commercial chassis used in hearses and ambulances, etc.), and Fleetwood Eldorado (two-door hardtop coupe and two-door convertible)

I. D. NUMBERS

CHASSIS

ModelWheelbaseOverall lengthTires
Commercial chassis4001mm-L-78 x 15
Seventy-Five3848mm6281mm
Sixty-special3378mm5812mm
Eldorado3208mm5629mm
All others3302mm5735mm

SPECIFICATIONS

FLUID CAPACITIES

EngineV8 472cc (7.7L)V8 500cc (8.2L)
Crankcase4 or 5 qt5 qt
Crankcase with new filter5 or 6 qt6 qt
AutomaticTransmission after draining25 or 26 pt26 pt
Drive Axle5 or 4.5 pt4.5 pt
Fuel tank26 gal(US)24 gal(US)
Cooling with heater21 qt20 qt
Cooling with A/C21 qt20 qt
Heavy duty Cooling25 qt22 qt

GASOLINE ENGINE TUNE-UP SPECS

Engine V.I.N CodeRS
Engine typeV8-472cc(7.7L)V8-500cc(8.2L)
Fuel delivery4 bbl4 bbl
ManufacturerCadillacCadillac
Original Spark plugR46NR46N
Gap0.035 in.0.035 in
Distributor Point Dwell30°30°
Distributor Point Gap0.016"0.016"
Ignition timing (BTDC)7½°
Intake valve opens (BTDC)1818
Fuel pump pressure6 psi6 psi
Idle speed600 rpm600 rpm

ALTERNATOR AND REGULATOR SPECS

Part #1100911110090811006941117144
Field current @ 12 V2.2 - 2.62.2 - 2.62.8 - 3.24.0 - 4.5
Output42 amps55 amps63 amps145 amps
Regulator Field-Relay: Air Gap0.015"0.015"Solid StateSolid State
Regulator Field-Relay: Point Gap0.030"0.030"
Regulator Field-Relay: Volts to Close1.5 - 3.21.5 - 3.2
Regulator Air Gap0.060"0.060"
Regulator Point Gap0.014"0.014"
Regulator Volts @ 75°13.5 - 14.413.5 - 14.413.8 - 14.813.5 - 14.4

BATTERY AND STARTER SPECS

EngineV8-472cc (7.7L)V8-500cc (8.2L)
Battery Ampere Hour Capacity7474
Battery Volts1212
Battery Terminal GroundedNeg.Neg.
Starter, Lock Test, AmpsNot RecommendedNot Recommended
Starter, Lock Test, Volts
Starter, Lock Test, Torque
Starter, No-Lead Test, Amps70 - 9970 - 99
Starter, No-Lead Test, Volts99
Starter, No-Lead Test, RPM78007800
Starter, Brush Spring Tension35 oz. min.35 oz. min.

GENERAL ENGINE SPECS

Engine V.I.N CodeRS
Engine typeV8-472cc(7.7L)V8-500cc(8.2L)
ManufacturerCadillacCadillac
Fuel delivery4 bbl4 bbl
Horsepower375@4400365@4400
Torque525@3000535@2800
Bore x Stoke4.300 x 4.0604.300 x 4.304
Compression Ratio8.8:18.5:1
Oil pressure35 - 40 psi35 - 40 psi

CRANKSHAFT SPECS

Engine typeV8-472cc(7.7L)V8-500cc(8.2L)
Main Brg Journal Dia.3.2503.250
Main Brg Oil Clearance0.0003 - 0.00260.0003 - 0.0026
Shaft End-play0.002 - 0.0120.002 - 0.012
Thrust on No.33

CONNECTING ROD SPECS

Engine typeV8-472cc(7.7L)V8-500cc(8.2L)
Journal Dia.2.50002.5000
Oil Clearance0.0005 - 0.00280.0005 - 0.0028
Side Clearance0.008 - 0.0160.008 - 0.016

PISTON AND RING SPECS

Engine typeV8-472cc(7.7L)V8-500cc(8.2L)
Piston-Bore Clearance0.0006 - 0.00100.0006 - 0.0010
Ring Side Clearance: Top Compression0.0017 - 0.00400.0017 - 0.0040
Ring Side Clearance: Bottom Compression0.0017 - 0.00400.0017 - 0.0040
Ring Side Clearance: Oil ControlNone (side sealing)None (side sealing)
Ring Gap: Top Compression0.013 - 0.0250.013 - 0.025
Ring Gap: Bottom Compression0.013 - 0.0250.013 - 0.025
Ring Gap: Oil Control0.015 - 0.0550.015 - 0.055

VALVE SPECS

Engine typeV8-472cc(7.7L)V8-500cc(8.2L)
Seat Angle45°44°
Face Angle45°44°
Spring Test Pressure160 lb @ 1.50 in.160 lb @ 1.50 in.
Spring Installed Height11516 in. (1.671875")11516 in. (1.9375")
Stem-to-Guide Clearance: Intake0.0005 - 0.00250.0005 - 0.0025
Stem-to-Guide Clearance: Exhaust0.0010 - 0.00250.0010 - 0.0025
Stem Diameter: Intake0.3415 - 0.34250.3415 - 0.3425
Stem Diameter: Exhaust0.3415 - 0.34200.3415 - 0.3420

TORQUE SPECS

Engine typeV8-472cc(7.7L)V8-500cc(8.2L)
Cyl. Head Bolts115 ft.lb115 ft. lb
Rod Brg Bolts40 ft.lb40 ft. lb
Main Brg Bolts90 ft.lb90 ft. lb
Crankshaft Damper or Pulley BoltPress fitPress fit
Flywheel to Crankshaft Bolts75 ft.lb75 ft. lb
Intake Manifold30 ft.lb30 ft. lb
Exhaust Manifold35 ft.lb35 ft. lb

CARBURETOR SPECS

Carb ID7041777 (4MV)7041766 (4MV)
Float Level1132 in.14 in.
Pump Rod1132 in.1132 in.
Choke Unloader0.300 in0.300 in
Fast Idle Speed1925 rpm1925 rpm

WHEEL ALIGNMENT SPECS

Feature Eldorado Full size
Caster Range ½°N - 1½°N 1½°N - ½°N
Caster Pref. 1°N 1°N
Camber LH wheel Range 38°N - 38°P 38°P - 38°N
Camber LH wheel Pref.
Camber RH wheel Range 38°N - 38°P 1/8°P - 5/8°N
Camber RH wheel Pref. ¼°N
Toe-In 0" 18 in. - 14 in.
Steering Axis Inclination11°

HISTORICAL NOTES

1971 Cadillac Notes

Calais6,929 (decreased 12,893)
Sedan de Ville69,345 (decreased 21,159)
Coupe de Ville66,081 (decreased 9,962)
Eldorado27,368 (increased 3,526)
Series 6015,200 (decreased 3,451)
Series 753,614 (decreased 1,008)



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