Nissan L14

Nissan L14 engineThe Nissan / Datsun L14 is a carbureted 1.4 liter (1,428 cc, 87.14 cu in) straight-4, four-stroke cycle gasoline engine from Nissan L-family.

The Nissan L14 engine is a four-cylinder in-line unit equipped with a single overhead camshaft and fully balanced five bearing crankshaft. The valves are operated through rockers which are directly activated by the cam mechanism. The L14 engine has cast iron cylinder block and aluminum alloy cylinder head.

It has an 83 mm (3.27 in) cylinder bore and 66 mm (2.60 in) piston stroke with a compression ratio of 9.0:1. It produced from 85 PS (84 HP, 62 kW) at 6,000 rpm to 95 PS (94 HP, 70 kW) at 6,400 rpm of horsepower and from 116 Nm (11.8 kg·m, 85 lb·ft) at 3,600 rpm to 122 Nm (12.4 kg·m, 90 lb·ft) at 4,000 rpm of torque.

The breakdown of the engine code is as follows:

  • L – Engine Family
  • 14 – 1.4 Liter Displacement

General information

Engine Specifications
Engine codeL14
LayoutFour stroke, Inline-4 (Straight-4)
Fuel typeGasoline
Production
Displacement1.4 L, 1,428 cm3 (87.14 cu in)
Fuel systemCarburetor
Power adderNone
Max. horsepower 85 PS (84 HP, 62 kW) at 6,000 rpm (Single carb.)
95 PS (94 HP, 70 kW) at 6,400 rpm (SU twin carb.)
Max. torque 116 Nm (11.8 kg·m, 85 lb·ft) at 3,600 rpm (Single carb.)
122 Nm (12.4 kg·m, 90 lb·ft) at 4,000 rpm (SU twin carb.)
Firing order1-3-4-2
Dimensions (L x H x W):
Weight

Cylinder block

The L14 engine has a cast-iron cylinder block. The crankshaft is a special steel forging, with the center main bearing equipped with thrust washers to take up the end thrust of the crankshaft. The Nissan (Datsun) L14 engine cylinder bore is 83 mm (3.27 in) and the piston stroke is 66 mm (2.60 in).

The special aluminum pistons are of the strut construction to control thermal expansion and have two compression rings and one combined oil ring. The gudgeon pins have special hollow steel shafts and are a fully floating fit in the pistons and a press-fit in the connecting rods.

Cylinder block
Cylinder block alloyCast iron
Compression ratio:9.0:1
Cylinder bore:83 mm (3.27 in)
Piston stroke:66 mm (2.60 in)
Number of piston rings (compression / oil):2 / 1
Number of main bearings:5
Cylinder inner diameter (standard):83.000 mm (3.2677 in)
Piston skirt diameter (standard):82.985-83.035 mm (3.2671-3.2691 in)
Piston pin outer diameter:20.995-21.000 mm (0.8266-0.8268 in)
Piston ring side clearance:Top0.040-0.080 mm (0.0016-0.0031 in)
Second0.030-0.070 mm (0.0012-0.0028 in)
Piston ring end gap:Top0.23-0.38 mm (0.0091-0.0150 in)
Second0.15-0.30 mm (0.0059-0.0118 in)
Oil0.30-0.90 mm (0.012-0.035 in)
Connecting rod center distance:136.6 mm (5.35 in)
Crankshaft journal diameter:54.942-54.955 mm (2.1631-2.1336 in)
Crankpin diameter:49.961-49.974 mm (1.9670-1.9675 in)
Crankshaft center distance:33.000 mm (1.2992 in)

Cylinder head

The aluminum alloy cylinder head contains wedge-type combustion chambers and is fitted with aluminum bronze valve seats for the intake valves and heat resistant steel valve seats for the exhaust valves. Intake valves are 38.0 mm (1.53 in) in diameter and the exhaust valves are 33.0 mm (1.30). The L14 motor used the single type valve springs on intake valves and dual type valve springs on exhaust valves. The cast iron camshaft is driven by chain from the crankshaft pulley.

The engine is pressure-lubricated by a rotor type oil pump which draws oil through an oil strainer into the pump housing and then forces it through a full-flow oil filter into the main oil gallery.

Cylinder head (Single carburetor specs)
Valve Arrangement:OHV, chain drive
Valves:8 (2 valves per cylinder)
Intake/Exhaust duration:232°/240°
Valve head diameter:INTAKE38.0 mm (1.5361 in)
EXHAUST33.0 mm (1.2992 in)
Valve length:INTAKE115.6-115.9 mm (4.551-4.562 in)
EXHAUST115.7-116.0 mm (4.555-4.567 in)
Valve stem diameter:INTAKE7.965-7.980 mm (0.3136-0.3142 in)
EXHAUST7.945-7.960 mm (0.3128-0.3134 in)
Valve spring free length:INTAKE49.0 mm (1.929 in)
EXHAUST Outer: 49.98 mm (1.968 in)
Inner: 44.85 mm (1.766 in)
Camshaft robe lift:INTAKE6.65 mm (0.2618 in)
EXHAUST6.65 mm (0.2618 in)
Rocker arm lever ratio:1.5
Outer camshaft journal diameter:47.949-47.962 mm (1.8878-1.8883 in)

Tightening torque specs

Tightening torque specs
Cylinder head bolt Step 1: 40 Nm; 4.0 kg·m; 28.9 ft·lb
Step 2: 60 Nm; 6.0 kg·m; 43.4 ft·lb
Step 3: 60-85 Nm; 6.5-8.5 kg·m; 47.0-61.5 ft·lb
Connecting rod big end nuts44-54 Nm; 4.5-5.5 kg·m; 33-40 ft·lb
Flywheel bolt137-157 Nm; 14.0-16.0 kg·m; 101-116 ft·lb
Main bearing cap bolt44-54 Nm; 4.5-5.5 kg·m; 33-40 ft·lb
Camshaft sprocket bolt118-157 Nm; 12.0-16.0 kg·m; 87-116 ft·lb
Oil pan bolts6-9 Nm; 0.6-0.0 kg·m; 4.3-6.5 ft·lb
Oil pump bolt11-15 Nm; 1.1-1.5 kg·m; 8-11 ft·lb
Oil pan drain plug20-30 Nm; 2.0-3.0 kg·m; 14-22 ft·lb
Rocker pivot lock nut49-59 Nm; 5.0-6.0 kg·m; 36-44 ft·lb
Camshaft locating plate bolts6-9 Nm; 0.6-0.0 kg·m; 4.3-6.5 ft·lb
Manifold nuts8-12 Nm; 0.8-1.2 kg·m; 5.8-8.7 ft·lb
Fuel pump nuts12-18 Nm; 1.2-1.8 kg·m; 8.7-13.0 ft·lb
Crank pulley nut118-157 Nm; 12.0-16.0 kg·m; 87-116 ft·lb

Maintenance data

Valve clearance (HOT)
Intake valve0.25 mm (0.010 in)
Intake valve0.30 mm (0.012 in)
Valve clearance (COLD)
Intake valve0.20 mm (0.008 in)
Exhaust valve0.25 mm (0.010 in)
Compression pressure
Standard12.0 kg/cm2 (11.77 bar, 171 psi) / 350 rpm
Minimun9.0 kg/cm2 (8.83 bar, 128 psi) / 250 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
Oil type APISE
Engine oil capacity (Refill capacity) Hight level: 4.3 l
Low level: 3.3 l
Oil change interval, km (miles)5,000-10,000 (3,000-6,000)
Oil pressure, kg/cm2 (psi)3.5-4.2 (49.8-56.9) at 2,000 rpm
Ignition system
Spark plugBP5ES (NGK)
Spark plug gap0.8-0.9 mm (0.03 -0.035 in)

Vehicle applications

ModelYears Produced
Nissan Bluebird (510)1968–1973
Datsun 5101968–1973
Nissan Violet/140J (J710/J711)
Datsun Sunny Excellent (PB110)1971–1973
Datsun Sunny Excellent – Coupe (KPB110)1971–1973
Nissan Sunny Excellent (PB210)1973–1976
Datsun 140Z (PB210)1973-1974
Nissan GR-1 (Concept)1975
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