Nissan Z20S

Nissan Z20S engineThe Nissan Z20 or Z20S is a carbureted 2.0 liter (1952 cc) straight-four, four-stroke cycle gasoline from Nissan Z-family. The Z20 engine was manufactured from 1979 through 1984. It replaced the Nissan L20B while using many of the same components.

The Nissan Z20S engine features a cast-iron block and aluminum alloy cylinder head with two ignition plugs per cylinder, but for some commercial vehicles, a single-spark plug head was used. It has a single overhead camshaft and 8 valves (2 per cylinder).

It has an 85 mm (3.34 in) cylinder bore and 86 mm (3.38 in) piston stroke with a compression ratio of 8.5:1 or 9.3:1. It produced from 86 HP (87 PS, 86 kW) up to 108 HP (110 PS, 88 kW) of horsepower at 5,200 rpm and 161 Nm (120 ft-lb) of torque.

The breakdown of the engine code is as follows:

  • Z – Engine Family
  • 20 – 2.0 Liter Displacement
  • S – carburetor

General information

Engine Specifications
Engine codeZ20S
LayoutFour stroke, Inline-4 (Straight-4)
Fuel typeGasoline
Production1979-1984
Displacement2.0 L, 1,952 cc (121.92 cu in)
Fuel systemCarburetor
Power adderNone
Max. horsepower108 HP (110 PS, 88 kW) at 5,200 rpm
Max. torque161 Nm (120 ft-lb) at 3,200 rpm
Firing order1-3-4-2
Dimensions (L x H x W):
Weight

Cylinder block

The Z20S engine has a cast-iron cylinder block, bore is 85 mm (3.34 in) and stroke is 86 mm (3.38 in). The cylinder block, a monoblock specially cast structure, employs the five bearing support system. The pistons are each fitted with two compression rings and a single oil ring.

Cylinder block
Cylinder block alloyCast iron
Compression ratio:8.5:1 or 9.3:1
Cylinder bore:85 mm (3.34 in)
Piston stroke:86 mm (3.38 in)
Number of piston rings (compression / oil):2 / 1
Number of main bearings:5
Cylinder inner diameter (standard):85.000-85.050 mm (3.3465-3.3484 in)
Piston skirt diameter (standard):84.985-85.035 mm (3.3459-3.3478 in)
Piston pin outer diameter:20.993-20.998 mm (0.8265-0.8267 in)
Piston ring side clearance:Top0.040-0.073 mm (0.0016-0.0029 in)
Second0.030-0.063 mm (0.0012-0.0025 in)
Oil
Piston ring end gap:Top0.25-0.40 mm (0.0098-0.0157 in)
Second0.15-0.30 mm (0.0059-0.0118 in)
Oil0.30-0.90 mm (0.012-0.035 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:42.97-43.03 mm (1.6917-1.6941 in)

Cylinder head

The cylinder head is made of a light, strong aluminum alloy with good cooling efficiency. Intake valves are 42 mm in diameter and the exhaust valves are 38 mm.

Cylinder head
Valve Arrangement:SOHC, chain drive
Valves:8 (2 valves per cylinder)
Intake/Exhaust duration:248°/248°
Valve head diameter:INTAKE42.0-42.2 mm (1.654-1.661 in)
EXHAUST38.0-38.2 mm (1.496-1.4504 in)
Valve length:INTAKE 122.8-123.1 mm (4.835-4.846 in) – Datsun 510
124.1-124.4 mm (4.885-4.898 in) – Nissan 720
EXHAUST 123.6-123.9 mm (4.866-4.878 in) – Datsun 510
125.1-125.4 mm (4.925-4.937 in) – Nissan 720
Valve stem diameter:INTAKE7.965-7.980 mm (0.3136-0.3142 in)
EXHAUST7.945-7.960 mm (0.3128-0.3134 in)
Cam height:INTAKE/EXHAUST 38.477-38.527 mm (1.5148-1.5168 in) – Datsun 510
38.481-38.531 mm (1.5150-1.5170 in) – Nissan 720
Outer camshaft journal diameter:32.935-32.955 mm (1.2967-1.2974 in)

Tightening torque specs

Tightening torque specs
Front cover bolt M8: 10-16 Nm; 1.0-1.6 kg·m; 7-12 ft·lb
M6: 3.9-9.8 Nm; 0.4-1.0 kg·m; 2.9-7.2 ft·lb
Chain guide bolt5.9-9.8 Nm; 0.6-1.0 kg·m; 4.3-7.2 ft·lb
Chain tensioner bolt5.9-9.8 Nm; 0.6-1.0 kg·m; 4.3-7.2 ft·lb
Water pump bolt M8: 10-16 Nm; 1.0-1.6 kg·m; 7-12 ft·lb
M6: 3.9-9.8 Nm; 0.4-1.0 kg·m; 2.9-7.2 ft·lb
Crank pulley bolt118-157 Nm; 12-16 kg·m; 87-116 ft·lb
Water inlet bolt10-16 Nm; 1.0-1.6 kg·m; 7-12 ft·lb
Water outlet bolt10-16 Nm; 1.0-1.6 kg·m; 7-12 ft·lb
Intake manifold bolt and nut16-21 Nm; 1.6-2.1 kg·m; 12-15 ft·lb
Alternator bracket bolt39-59 Nm; 4.0-6.0 kg·m; 29-43 ft·lb
Alternator to adjusting bar bolt20-29 Nm; 2.0-3.0 kg·m; 14-22 ft·lb
Engine mounting bracket bolt29-39 Nm; 3.0-4.0 kg·m; 22-29 ft·lb
Exhaus manifold bolt and nut16-21 Nm; 1.6-2.1 kg·m; 12-15 ft·lb
EGR tube nut34-44 Nm; 3.5-4.5 kg·m; 25-33 ft·lb
EAI tube nut34-44 Nm; 3.5-4.5 kg·m; 25-33 ft·lb
Cylinder head bolt69-78 Nm; 7.0-8.0 kg·m; 51-58 ft·lb
Cylinder head to front cover bolt3.9-7.5 Nm; 0.4-0.7 kg·m; 2.9-5.8 ft·lb
Rocker shaft bracket bolt15-25 Nm; 1.5-2.5 kg·m; 11-18 ft·lb
Camshaft sprocket bolt118-157 Nm; 12-16 kg·m; 87-116 ft·lb
Rocker arm nut16-22 Nm; 1.6-2.2 kg·m; 12-16 ft·lb
Main bearing cap bolt44-54 Nm; 4.5-5.5 kg·m; 33-40 ft·lb
Connecting rod big end nut44-54 Nm; 4.5-5.5 kg·m; 33-40 ft·lb
Gusset to cylinder block43-58 Nm; 4.4-5.9 kg·m; 32-43 ft·lb
Flywheel bolt (M/T)137-157 Nm; 14-16 kg·m; 101-116 ft·lb
Drive plate bolt (A/T)137-157 Nm; 14-16 kg·m; 101-116 ft·lb
Clutch cover bolt (M/T)16-21 Nm; 1.6-2.1 kg·m; 12-15 ft·lb
Torque coverter bolt (A/T)39-49 Nm; 4.0-5.0 kg·m; 29-36 ft·lb
Starter motor bolt29-39 Nm; 3.0-4.0 kg·m; 22-29 ft·lb
Transmission to cylinder block bolt43-58 Nm; 4.4-5.9 kg·m; 32-43 ft·lb
Transmission to gusset bolt43-58 Nm; 4.4-5.9 kg·m; 32-43 ft·lb

Maintenance data

Valve clearance (HOT)
Intake valve0.30 mm (0.012 in)
Exhaust valve0.30 mm (0.012 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
5W-40
10W-30
10W-40
Oil type APISE
Engine oil capacity (Refill capacity) With filter change 4.4 l
Without filter change 3.9 l
Oil change interval, km (miles)5,000-10,000 (3,000-6,000)
Ignition system
Ignition timing (B.T.D.C./rpm)6-12°/600 rpm (depends on the country and vehicle model)
Spark plug Cold: BP7ES, BPR7ES
Standard: BP6ES, BPR6ES
Hot: BP5ES, BPR5ES
Spark plug gap0.8-0.9 mm (0.03 -0.035 in)
Spark plug tightening torque15-20 Nm; 1.5-2.0 kg·m; 11-14 ft·lb

Vehicle applications

ModelYears Produced
Datsun 5101979-1981
Datsun 7201981
Nissan Cabstar
Nissan / Datsun Caravan, Urvan, Hony (E23)1980-1986
Nissan Laurel C2301979-1980
Nissan Laurel C311980-1984
Datsun D21
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