L24 Specs – Datsun 240Z Engine Specifications

Here are all of the verified engine statistics from the Datsun 240Z factory service manual for the L24.

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General specifications

• Engine code number: L24
• Engine type: Six cylinder (in-line), single overhead camshaft (SOHC)
• Displacement: 146.0 cubic in (2393 cc)
• Bore: 3.27 in (83 mm)
• Stroke: 2.9 in (73.7 mm)
• Maximum brake horsepower: 151 @ 5600 revolutions/minute (rpm)
• Maximum gross torque (lb./ft.): 146 @ 4400 revolutions/minute (rpm)
• Compression ratio: 8.8:1 (98 oct)
• Oil pressure (hot at 2000 rpm): 50-57 lb/(in squared) or 3.5-4.0 kg/(cm squared)
• Engine oil (sump): 8.2 lmp pints (4.7 liters / 9.9 U.S. pints)

 

Crankshaft

• Journal diameter: 2.1631-2.1636 in (54.942-54.955 mm)
• Maximum taper or ovality of journal: 0.0004 in (0.01 mm)
• Maximum endfloat: 0.0118 in (0.3 mm)
• Crankpin diameter: 1.9670-1.9675 in (49.961-49.974 mm)
• Maximum taper and ovality or crankpin: 0.0118 in (0.3mm)
• Main bearing thickness: 0.0717-0.0722 in (1.822-1.835 mm)
• Main bearing running clearance: 0.0008-0.0028 in (0.020-0.072 mm)
• Running clearance (wear limit): 0.0047 in (0.12 mm)

 

Camshaft

• Journal diameter: 1.8878-1.8883 in (47.949-47.962 mm)
• Bearing inside diameter: 1.8898-1.8904 in (48.000-48.016 mm)
• Running clearance: 0.0015-0.0026 in (0.038-0.067 mm)
• Camshaft endfloat: 0.0031-0.0150 in (0.08-0.38 mm)
• Camshaft lobe lift: 0.2756 in (7.00 mm)

 

Pistons

• Standard diameter: 3.267-3.269 in (82.985-83.035 mm)
• Oversizes for L24 engine:
  • First: 3.276-3.278 in (83.22-83.27 mm)
  • Second: 3.286-3.288 in (83.47-83.52 mm)
  • Third: 3.296-3.298 in (83.72-83.77 mm)
  • Fourth: 3.305-3.308 in (83.97-84.02 mm)
  • Fifth: 3.326-3.328 in (84.47-84.52 mm)
• Piston to bore clearance: 0.0010-0.0018 in (0.025-0.045 mm)
• Piston ring groove width
  • Top compression: 0.079 in (2.0 mm)
  • Second compression: 0.079 in (2.0 mm)
  • Oil control: 0.0157 in (4.0 mm)

 

Piston Rings

• Thickness
  • Top compression: 0.0778 in (1.977 mm)
  • Second compression: 0.0778 in (1.977 mm)
• Ring end gap
  • Top compression: 0.0091-0.0150 in (0.23-0.38 mm)
  • Second compression: 0.0059-0.0118 in (0.15-0.30 mm)
• Clearance in groove
  • Top compression: 0.0018-0.0031 in (0.045-0.080 mm)
  • Second compression: 0.0012-0.0028 in (0.030-0.070 mm)

 

Gudgeon pins

• Diameter: 0.8265-0.8267 in (20.933-20.998 mm)
• Length: 2.8346-2.8445 in (72.00-72.25 mm)
• Clearance (gudgeon pin to piston): 0.0002-0.0051 in (0.006-0.013 mm)
• Interference fit in connecting rod small end: 0.0006-0.0013 in (0.015-0.033 mm)

 

Connecting rods

• Distance between centers: 5.237 in (133.08 mm)
• Bearing thickness (big-end): 0.0588-0.0593 in (1.493-1.506 mm)
• Big-end running clearance: 0.0010-0.0022 in (0.025-.055 mm)
• Big-end endfloat: 0.006-0.0013 in (0.015-0.033 mm)

 

Valves

• Clearance (hot)
  • Inlet: 0.010 in (0.25 mm)
  • Exhaust: 0.012 in (0.30 mm)
• Clearance (cold)
  • Inlet: 0.008 in (0.20 mm)
  • Exhaust: 0.010 in (0.25 mm)
• Valve head diameter
  • Inlet: 1.65 in (42.0 mm)
  • Exhaust: 1.38 in (35.0 mm)
• Valve stem diameter
  • Inlet: 0.3136-0.3142 in (7.965-7.980 mm)
  • Exhaust 0.3128-0.3134 in (7.945-7.960 mm)
• Valve length
  • Inlet: 4.36 in (110.7 mm)
  • Exhaust 4.36 in (110.7 mm)
• Valve lift: 0.433 in (11.0 mm)
• Spring free length
  • Outer: 1.968 in (49.98 mm)
  • Inner: 1.766 in (44.85 mm)
• Spring coil diameter
  • Outer: 1.307 in (33.2 mm)
  • Inner: 0.980 in (24.9 mm)
• Guide length: 2.323 in (59.0 mm)
• Guide inside diameter: 0.3150-0.3157 in (8.000-8.018 mm)
• Guide outside diameter (standard): 0.4718-0.4723 (11.985-11.996 mm)
• Guide to stem clearance
  • Inlet: 0.0008-0.0021 in (0.020-0.053 mm)
  • Exhaust: 0.0016-0.0029 in (0.040-0.073 mm)
• Seat width
  • Inlet: 0.055-0.063 in (1.4-1.6 mm)
  • Exhaust: 0.071-0.087 in (1.8-2.2 mm)
• Seat angle: 45 degrees

 

Torque Wrench Guidelines

• Cylinder head bolts 
  • Stage 1: 29 lb-ft (4.0 kg-m)
  • Stage 2: 40 lb-ft (5.5 kg-m)
  • Stage 3: 60 lb-ft (8.3 kg-m)
• Big-end bolts: 30 lb-ft (4.1 kg-m)
• Flywheel bolts: 100 lb-ft (13.8 kg-m)
• Main bearing cap bolts: 40 lb-ft (5.5 kg-m)
• Camshaft sprocket bolt: 40 lb-ft (5.5 kg-m)
• Sump bolts: 7 lb-ft (0.9 kg-m)
• Oil pump bolts: 11 lb-ft (1.5 kg-m)
• Rocker pivot locknuts: 40 lb-ft (5.5 kg-m)
• Camshaft locating plate bolts: 6 lb-ft (0.8 kg-m)
• Manifold nuts: 8 lb-ft (1.1 kg-m)
• Fuel pump nuts: 13 lb-ft (1.8 kg-m)
• Crankshaft pulley bolt: 100 lb-ft (13.8 kg-m)
• Front cover bolts
  • Large: 11 lb-ft (1.5 kg-m)
  • Small: 5 lb-ft (0.7 kg-m)
• Air pump mounting bolts: 18 lb-ft (2.5 kg-m)
• Air pump adjustment strap bolt: 13 lb-ft (1.8 kg-m)
• Clutch bellhousing to engine bolts: 36 lb-ft (4.9 kg-m)
• Torque converter housing to engine bolts: 36 lb-ft (4.9 kg-m)
• Driveplate to torque converter: 36 lb-ft (4.9 kg-m)
• Driveplate to crankshaft: 100 lb-ft (13.8 kg-m)
• Propeller shaft flange to pinion flange bolts: 23 lb-ft (3.2 kg-m)
• Exhaust downpipe flange nuts: 18 lb-ft (2.5 kg-m)