Nissan L24

Nissan L24 engineThe 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 codeL24 / L24T
LayoutFour stroke, Inline-6 (Straight-6)
Fuel typeGasoline
Displacement2.4 L, 2,393 cm3 (146.0 cu in)
Fuel systemSingle carburetor
Power adderNone
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 order1-5-3-6-2-4
Dimensions (L x H x W):

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 alloyCast 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:Top0.045-0.080 mm (0.0018-0.0031 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)
Oil0.15-0.30 mm (0.0059-0.0118 in)
Piston ring height:Top1.977 mm (0.0778 in)
Second1.977 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)
EXHAUST33.0 mm (1.31 in)
Valve length:INTAKE Single carb: 115.9 mm (4.562 in)
Twin carb: 115.2 mm (4.535 in)
EXHAUST116.0 mm (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: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 nut37-44 Nm; 3.7-4.3 kg·m; 27-31 ft·lb
Flywheel bolt127-146 Nm; 13.0-15.0 kg·m; 94-108 ft·lb
Camshaft sprocket bolt127-147 Nm; 13.0-15.0 kg·m; 94-108 ft·lb
Main bearing cap bolt44-54 Nm; 4.5-5.5 kg·m; 33-40 ft·lb
Crank pulley bolt127-147 Nm; 13.0-15.0 kg·m; 94-108 ft·lb
Rocker pivot lock nut49-59 Nm; 5.0-6.0 kg·m; 36-46 ft·lb

Maintenance data

Valve clearance (HOT)
Intake valve0.25 mm (0.010 in)
Exhaust 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
Oil type APISE
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
Spark plug gap0.8-0.9 mm (0.03 -0.035 in)

Vehicle applications

ModelYears Produced
Datsun 240Z1970–1973
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 C2301979–1980
Nissan Laurel C311980–1984
Author: Sergei Wers
About: Co-founder and CEO of a multi-brand auto repair shop (engine repair, chassis repair, body repair and painting) for over 15 years. I have been developing internet sites with technical specifications for more than seven years.

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1 Comment

  1. Does anyone list the overall length and height specifically of the S30 engine. Oh yeah, the weight of the assembled engine also.

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