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| Home / Car Engines / Nissan Engines / Nissan A12 |
Nissan A12 Engine Specifications
The Nissan A12 is a 1.2 l (1,171 cc, 71.45 cubic inches)
four-cylinder four-stroke gasoline engine from Nissan A-family. The
engine was manufactured by Nissan Motor Company from 1970. In 1974 the
A12 engine was redesigned.
The A12 motor uses a lightweight cast-iron block and an aluminum
cylinder head, with overhead valves and a single camshaft. The engine
was equipped with a two-barrel (twin-choke) Hitachi carburetor. Bore and
stroke were 73.0 mm (2.87 in) and 70.0 mm (2.76 in). The
compression ratio rating is 9.0:1. The A12 produced 71 PS (52.0 kW; 70.0
HP) of max power and 95 Nm (9.69 kgm; 70.11 lb-ft) of peak torque.
For the 1974 model year, the A12 motor was modified, it used the new
block style. The distributor was moved from the front side of the engine
to the middle of the engine block to make room for an air conditioning
system and anti-pollution air pump. Redesigned Nissan A12 engine used
the new emission control technology, called NAPS (Nissan Anti Pollution
System).
Special versions:
The A12GX was equipped with twin Hitachi side-draft carburetors and
longer-duration camshaft. The compression ratio was 10:1 and maximum
power was 84 PS (62 KW; 83 HP) at 6,400 rpm. The A12GX was used on Sunny
1200 GX (Sedans and Coupes) for the JDM market.
The A12T had identical specification with A12GX and was used on Nissan
Cherry X-1.
The AY12 was a racing version of the A12 engine with 1,300 cc (79 cubic
inches) of displacement, a crossflow cylinder head, a special design of
pistons and a valve rocker system.
Engine code identification:
A - Engine Family
12 - 1.2 Liter Displacement
S - Carburetor type
| GENERAL TECHNICAL DATA |
Engine model ............... A12
Cylinder layout ............... Four stroke, Inline-4 (Straight-4)
Fuel type ............... Gasoline (petrol)
Production years ............... From 1971
Total displacement ............... 1.2 L, 1,171 cc (71.45 cubic inches)
Fuel system ............... Carburetor type
Power adder ............... None
Maximum power ............... 71 PS (52.0 KW; 70.0 HP)
Maximum torque ............... 95 Nm (9.69 kgm; 70.11 lb-ft)
Firing order ............... 1-3-4-2
Dimensions (L x W x H) ............... No data available
Weight ............... No data available
| CYLINDER BLOCK |
The engine has a cast-iron cylinder block utilizes a five bearing supported
system. The cylinder bore is 73.0 mm (2.87 in) and stroke is 70.0 mm
(2.76 in). The A12 engine has two compression and single oil control
ring.
Cylinder block alloy ............... Cast iron
Compression ratio ............... 9.0:1
Cylinder bore ............... 73.0 mm (2.87 in))
Piston stroke ............... 70.0 mm (2.76 in)
Number of piston rings (compression / oil) ............... 2 / 1
Number of main bearings ............... 5
Cylinder inner diameter (standard) ............... 73.000-73.050 mm
(2.8740-2.8760 in)
Piston skirt diameter (standard) ............... 72.967-72.017 mm
(2.8727-2.8747 in)
Piston pin outer diameter ............... 17.447-17.452 mm
(0.6869-0.6871 in)
Piston ring side clearance ............... Top ...............
0.040-0.070 mm (0.0016-0.0028 in)
Second ............... 0.040-0.070 mm (0.0016-0.0028 in)
Oil ............... 0.10 mm (0.0039 in)
Piston ring end gap ............... Top ............... 0.20-0.35 mm
(0.0079-0.0138 in)
Second ............... 0.20-0.35 mm (0.0079-0.0138 in)
Oil ............... 0.30-0.90 mm (0.0118-0.0354 in)
Crankshaft journal diameter ............... 49.943-49.964 mm
(1.9663-1.9671 in)
Crankpin diameter ............... 44.954-44.974 mm (1.7698-1.7706 in)
Connecting rod center distance ............... 121.5 mm (4.78 in)
| CYLINDER HEAD |
The valve system has a push rod type rocker arm which uses the single
type valve springs. The camshaft is driven with a double row roller
chain from the crankshaft. The tension of the chain is controlled by the
chain tensioner which is operated with spring and oil pressure. The
rubber shoe type tensioner insulates vibration of the chain and controls
the tension of the chain.
Intake valves are 35.0 mm (1.378 in) in diameter, and the exhaust valves
are 29.0 mm (1.142 in).
Valve Arrangement ............... OHV, chain drive
Valves ............... 8 (2 valves per cylinder)
Valve timing ............... INTAKE ............... 248 deg
EXHAUST ............... 248 deg
Valve head diameter ............... INTAKE ............... 35.0 mm
(1.378 in)
EXHAUST ............... 29.0 mm (1.142 in)
Valve length ............... INTAKE ............... 102.35-102.65 mm
(4.030-4.031 in)
EXHAUST ............... 102.35-102.65 mm (4.030-4.031 in)
Valve stem diameter ............... INTAKE ............... 7.960-7.975
mm (0.3134-0.3140 in)
EXHAUST ............... 7.945-7.960 mm (0.3128-0.3134 in)
Valve spring free length ............... 46.5 mm (1.831)
Cam height ............... INTAKE ............... 36.200-36.250 mm
(1.4252-1.4272 in)
EXHAUST ............... 36.200-36.250 mm (1.4252-1.4272 in)
Outer camshaft journal diameter ............... №1 ...............
43.783-43.796 mm (1.7237-1.7242 in)
№2 ............... 42.283-43.296 mm (1.6647-1.7046 in)
№3 ............... 42.783-42.796 mm (1.6844-1.6849 in)
№4 ............... 42.283-42.296 mm (1.6647-1.6652 in)
№5 ............... 41.208-41.221 mm (1.6224-1.6229 in)
| MAINTENANCE DATA |
Valve clearance (Cold)
Intake valve ............... 0.25 mm (0.0098 in)
Exhaust valve
Valve clearance (Hot)
Intake valve ............... 0.35 mm (0.0138 in)
Exhaust valve
Compression pressure
Standard ............... 13.5 kg/m2 (192 psi) / 350 rpm
Minimun ............... 12.5 kg/m2 (178 psi) / 350 rpm
Oil system
Oil consumption , L/1000 km (qt. per miles) ............... up to 0.5 (1
qt. per 1200 miles)
Recommended engine oil ............... 5W-30, 5W-40, 10W-30, 10W-40
Engine oil capacity (Refill capacity) ............... With oil filter
3.3 l (3.5 qt.)
Without oil filter 2.8 l (3.0 qt.)
Oil change interval, km (miles) ............... 5,000-10,000
(3,000-6,000)
Ignition system
Ignition coil ............... NGK: BP4ES; HITACHI: L47PW
Spark plug gap ............... 0.8 - 0.9 mm (0.031 - 0.035 in)
TIGHTENING TORQUE SPECS
Tightening torque specs
Cylinder head bolt ............... 69-74 Nm; 7.0-7.5 kgm; 51-54 lb-ft
Rocker shaft bracket bolt ............... 20-25 Nm; 2.0-2.5 kgm; 14-18
lb-ft
Connecting rod big end nut ............... 32-38 Nm; 3.2-3.8 kgm; 23-37
lb-ft
Flywheel bolt ............... 80-90 Nm; 8.0-9.0 kgm; 58-65 lb-ft
Drive plate fixing bolt ............... 85-95 Nm; 8.5-9.5 kgm; 61-69
lb-ft
Main bearing cap bolt ............... 50-60 Nm; 5.0-6.0 kgm; 36-43 lb-ft
Camshaft sprocket bolt ............... 40-48 Nm; 4.0-4.8 kgm; 29-35
lb-ft
Oil pan bolt ............... 15-20 Nm; 1.5-2.0 kgm; 11-14 lb-ft
Oil strainer bolt ............... 9-14 Nm; 0.9-1.4 kgm; 7-10 lb-ft
Oil pump bolt ............... 9-14 Nm; 0.9-1.4 kgm; 7-10 lb-ft
Oil pan drain plug ............... 20-30 Nm; 2.0-3.0 kgm; 14-22 lb-ft
Locating plate bolt ............... 4-5 Nm; 0.4-0.5 kgm; 3-4 lb-ft
Carbutetor nuts ............... 5-7 Nm; 0.5-0.7 kgm; 4-5 lb-ft
Manifold nuts ............... 15-20 Nm; 1.5-2.0 kgm; 11-14 lb-ft
Fuel pump nuts ............... 9-14 Nm; 0.9-1.4 kgm; 6.5-10 lb-ft
Crank pulley bolt ............... 150-200 Nm; 15-20 kgm; 108-145 lb-ft
Engine mounting bolt ............... 19-25 Nm; 1.9-2.5 kgm; 14-18 lb-ft
Water pump bolt ............... 9-14 Nm; 0.9-1.4 kgm; 6.5-10 lb-ft
Rocker pivot lock nut ............... 16-22 Nm; 1.6-2.2 kgm; 12-16 lb-ft
Timing chain cover bolt ............... 5-7 Nm; 0.5-0.7 kgm; 4-5 lb-ft
Spark plug ............... 15-20 Nm; 1.5-2.0 kgm; 11-14 lb-ft
| VEHICLE APPLICATIONS |
Model ............... Years Produced
Nissan Sunny (B110, B120) ............... 1971-1973
Nissan Cherry (E10) ............... 1971-1973
Datsun 120A ............... 1971-1973
Nissan 270X concept ............... 1970
Premier 118NE (Fiat 124) ............... 1985-2001
Nissan Sunny (B210) ............... 1974-1978
Datsun 120Y ............... 1974-1978
Nissan Cherry (E10) ............... 1974-1976
Datsun 120A ............... 1974-1976
Nissan Sunny (B310) ............... 1978-1982
Datsun 120Y ............... 1978-1982
Nissan Sunny Truck ............... 1974-1995
Nissan Pulsar (N10) ............... 1978-1982
Nissan Cherry (N10) ............... 1978-1982
Datsun 120A ............... 1978-1982
Nissan Vanette (C120) ............... 1978-1988
Premier 118NE ............... No data available
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| Engines Technical Specifications |