L26 Specs – Datsun 260Z Engine Specifications

Here are all of the verified engine statistics from the Datsun 260Z factory service manual for the L26.

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General specifications

  • Engine code number: L26
  • Engine type: Six cylinder (in-line), single overhead camshaft (SOHC)
  • Displacement: 156.6cubic in (2565 cc)
  • Bore: 3.27 in (83 mm)
  • Stroke: 3.11 in (79 mm)
  • Maximum brake horsepower: 165@ 5600 revolutions/minute (rpm)
  • Maximum gross torque (lb./ft.): 157 @ 4400 revolutions/minute (rpm)
  • Compression ratio8.3:1 (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 diameter1.9670-1.9675 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: 4.524-4.535 in. (114.9-115.2 mm)
    • Exhaust 4.555-4.567 in (115.7-116.0 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): 0.4733-0.4738 (12.023-12.034 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)

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