The 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 code | L14 |
| Layout | Four stroke, Inline-4 (Straight-4) |
| Fuel type | Gasoline |
| Production | – |
| Displacement | 1.4 L, 1,428 cm3 (87.14 cu in) |
| Fuel system | Carburetor |
| Power adder | None |
| 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 order | 1-3-4-2 |
| 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 alloy | Cast 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: | Top | 0.040-0.080 mm (0.0016-0.0031 in) |
| Second | 0.030-0.070 mm (0.0012-0.0028 in) | |
| Piston ring end gap: | Top | 0.23-0.38 mm (0.0091-0.0150 in) |
| Second | 0.15-0.30 mm (0.0059-0.0118 in) | |
| Oil | 0.30-0.90 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: | INTAKE | 38.0 mm (1.5361 in) |
| EXHAUST | 33.0 mm (1.2992 in) | |
| Valve length: | INTAKE | 115.6-115.9 mm (4.551-4.562 in) |
| EXHAUST | 115.7-116.0 mm (4.555-4.567 in) | |
| Valve stem diameter: | INTAKE | 7.965-7.980 mm (0.3136-0.3142 in) |
| EXHAUST | 7.945-7.960 mm (0.3128-0.3134 in) | |
| Valve spring free length: | INTAKE | 49.0 mm (1.929 in) |
| EXHAUST | Outer: 49.98 mm (1.968 in) Inner: 44.85 mm (1.766 in) | |
| Camshaft robe lift: | INTAKE | 6.65 mm (0.2618 in) |
| EXHAUST | 6.65 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 nuts | 44-54 Nm; 4.5-5.5 kg·m; 33-40 ft·lb |
| Flywheel bolt | 137-157 Nm; 14.0-16.0 kg·m; 101-116 ft·lb |
| Main bearing cap bolt | 44-54 Nm; 4.5-5.5 kg·m; 33-40 ft·lb |
| Camshaft sprocket bolt | 118-157 Nm; 12.0-16.0 kg·m; 87-116 ft·lb |
| Oil pan bolts | 6-9 Nm; 0.6-0.0 kg·m; 4.3-6.5 ft·lb |
| Oil pump bolt | 11-15 Nm; 1.1-1.5 kg·m; 8-11 ft·lb |
| Oil pan drain plug | 20-30 Nm; 2.0-3.0 kg·m; 14-22 ft·lb |
| Rocker pivot lock nut | 49-59 Nm; 5.0-6.0 kg·m; 36-44 ft·lb |
| Camshaft locating plate bolts | 6-9 Nm; 0.6-0.0 kg·m; 4.3-6.5 ft·lb |
| Manifold nuts | 8-12 Nm; 0.8-1.2 kg·m; 5.8-8.7 ft·lb |
| Fuel pump nuts | 12-18 Nm; 1.2-1.8 kg·m; 8.7-13.0 ft·lb |
| Crank pulley nut | 118-157 Nm; 12.0-16.0 kg·m; 87-116 ft·lb |
Maintenance data
| Valve clearance (HOT) | |
| Intake valve | 0.25 mm (0.010 in) |
| Intake valve | 0.30 mm (0.012 in) |
| Valve clearance (COLD) | |
| Intake valve | 0.20 mm (0.008 in) |
| Exhaust valve | 0.25 mm (0.010 in) |
| Compression pressure | |
| Standard | 12.0 kg/cm2 (11.77 bar, 171 psi) / 350 rpm |
| Minimun | 9.0 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 API | SE |
| 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 plug | BP5ES (NGK) |
| Spark plug gap | 0.8-0.9 mm (0.03 -0.035 in) |
Vehicle applications
| Model | Years Produced |
| Nissan Bluebird (510) | 1968–1973 |
| Datsun 510 | 1968–1973 |
| 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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