The Nissan (Datsun) L24 / L24T is a 2.4 liter (2,393 cc, 146.0 cu-in) straight-six, four-stroke cycle natural aspirated gasoline engine from Nissan L-family. The L24 engine was produced from 1969 through 1984. This engine is of the same design and external appearance as L20A.
The Nissan-Datsun L24 engine features a cast-iron block, a wedge-shaped combustion chamber, aluminum head with overhead camshaft and a fully balanced 7-bearing crankshaft and. The cylinder block is cast in a single unit and features deep skirting. The L24 is equipped with a single, two-barrel, downdraft carburetor. The SU twin carburetor provides a proper air-fuel mixture for the L24T engine.
The L24 with single carburetor has a compression ratio rating of 8.5:1, the L24T with SU twin-carb 9.0:1. Cylinder bore and piston stroke are 83.0 mm (3.27 in) and 73.7 mm (2.90 in), respectively. The L24 produced 130 PS (128 HP, 95 kW) of horsepower and 195 Nm (19.9 kg⋅m; 145 ft-lb) of torque. The L24T produced 150 PS (147 HP, 110 kW) and 197 Nm (20.1 kg⋅m; 146 ft-lb).
The breakdown of the engine code is as follows:
- L – Engine Family
- 24 – 2.4 Liter Displacement
General information
| Engine Specifications | |
| Engine code | L24 / L24T |
| Layout | Four stroke, Inline-6 (Straight-6) |
| Fuel type | Gasoline |
| Production | – |
| Displacement | 2.4 L, 2,393 cm3 (146.0 cu in) |
| Fuel system | Single carburetor |
| Power adder | None |
| Max. horsepower | 130 PS (128 HP, 95 kW) at 5,600 rpm (Single carb) 150 PS (147 HP, 110 kW) at 5,600 rpm (Twin carb) |
| Max. torque | 195 Nm (19.9 kg⋅m; 145 ft-lb) at 3,600 rpm (Single carb) 197 Nm (20.1 kg⋅m; 146 ft-lb) at 4,400 rpm (Twin carb) |
| Firing order | 1-5-3-6-2-4 |
| Dimensions (L x H x W): | – |
| Weight | – |
Cylinder block
The L24 engine has a cast-iron cylinder block, bore is 83.0 mm (3.27 in) and stroke is 73.7 mm (2.90 in). The cylinder block, a monoblock specially cast structure, employs the seven bearing support system for quietness and higher durability. The pistons are each fitted with two compression rings and a single oil ring.
The crankshaft of L24 engine is fabricated of special forged steel. Provided with a high capacity balance weight. Light-weight pistons are of cast aluminum slipper-skirt type with invar-strut. The piston pin is of a special hollow type and is connected to the piston in a full-floating fit, and is press-fitted into the connecting rods. The connecting rods are made of special forged steel.
| Cylinder block | ||
| Cylinder block alloy | Cast iron | |
| Compression ratio: | Single carb: 8.5:1 Twin carb: 9.0:1 | |
| Cylinder bore: | 83.0 mm (3.27 in) | |
| Piston stroke: | 73.7 mm (2.90 in) | |
| Number of piston rings (compression / oil): | 2 / 1 | |
| Number of main bearings: | 7 | |
| Cylinder inner diameter (standard): | 83.000-83.050 mm (3.2677-3.2696 in) | |
| Piston skirt diameter (standard): | 82.985-83.035 mm (3.2671-3.2691 in) | |
| Piston pin outer diameter: | 20.993-20.998 mm (0.8265-0.8267 in) | |
| Piston ring side clearance: | Top | 0.045-0.080 mm (0.0018-0.0031 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 | 0.15-0.30 mm (0.0059-0.0118 in) | |
| Piston ring height: | Top | 1.977 mm (0.0778 in) |
| Second | 1.977 mm (0.0778 in) | |
| Connecting rod center distance: | 133.00 mm (5.24 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: | 36.85 mm (1.4507 in) | |
Cylinder head
The cylinder head is made of a light, strong aluminum alloy with good cooling efficiency. The camshaft is made of specially cast iron and is located inside the rocker cover. The L24 engine has the intake valves with a head diameter of 38.0 mm (1.50 in) and the exhaust valves are 33.0 mm (1.31 in). The L24T has the intake valves with a head diameter of 42.0 mm (1.65 in). The intake manifold is cast aluminum and exhaust manifold is cast iron.
| Cylinder head | ||
| Cylinder head alloy: | Aluminum | |
| Valve Arrangement: | OHV, chain drive | |
| Valves: | 12 (2 valves per cylinder) | |
| Valve head diameter: | INTAKE | Single carb: 38.0 mm (1.50 in) Twin carb: 42.0 mm (1.65 in) |
| EXHAUST | 33.0 mm (1.31 in) | |
| Valve length: | INTAKE | Single carb: 115.9 mm (4.562 in) Twin carb: 115.2 mm (4.535 in) |
| EXHAUST | 116.0 mm (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: | OUTER | Single carb: 47.75 mm (1.88 in) Twin carb: 49.98 mm (1.968 in) |
| INNER | Single carb: 44.68 mm (1.76 in) Twin carb: 44.85 mm (1.766 in) | |
| 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 ft·lb Step 2: 60 Nm; 6.0 kg·m; 43 ft·lb Step 3: 73-83 Nm; 7.5-8.5 kg·m; 54-61 ft·lb |
| Connecting rod big end nut | 37-44 Nm; 3.7-4.3 kg·m; 27-31 ft·lb |
| Flywheel bolt | 127-146 Nm; 13.0-15.0 kg·m; 94-108 ft·lb |
| Camshaft sprocket bolt | 127-147 Nm; 13.0-15.0 kg·m; 94-108 ft·lb |
| Main bearing cap bolt | 44-54 Nm; 4.5-5.5 kg·m; 33-40 ft·lb |
| Crank pulley bolt | 127-147 Nm; 13.0-15.0 kg·m; 94-108 ft·lb |
| Rocker pivot lock nut | 49-59 Nm; 5.0-6.0 kg·m; 36-46 ft·lb |
Maintenance data
| Valve clearance (HOT) | |
| Intake valve | 0.25 mm (0.010 in) |
| Exhaust 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) | Maximum (H level): 5.0 l (1.3 US gal) Minimum (L level): 3.9 l (1.0 US gal) |
| Oil change interval, km (miles) | 5,000-10,000 (3,000-6,000) |
| Ignition system | |
| Spark plug | Cold: BP7ES, L44PW, BPR7ES Standard: BP6ES, L45PW, BPR6ES Hot: BP5ES, BP4ES, L46PW, L47PW, BPR5ES, BPR4ES |
| Spark plug gap | 0.8-0.9 mm (0.03 -0.035 in) |
Vehicle applications
| Model | Years Produced |
| Datsun 240Z | 1970–1973 |
| Nissan Cedric (130) | 1970–1971 |
| Nissan Cedric (230) | 1971–1972 |
| Nissan Gloria (130) | 1970–1971 |
| Nissan Gloria (230) | 1971–1972 |
| Datsun 240K (C110) | 1972–1977 |
| Datsun 240K-GT (C210) | 1978–1981 |
| Nissan Laurel C230 | 1979–1980 |
| Nissan Laurel C31 | 1980–1984 |
Author:
Does anyone list the overall length and height specifically of the S30 engine. Oh yeah, the weight of the assembled engine also.