Nissan Z20E

Nissan Z20EThe Nissan Z20E is a 2.0 liter (1952 cc) straight-four, four-stroke cycle gasoline from Nissan Z-family. The Z20E engine was producted from 1979 through 1988.

The Nissan Z20E engine features a cast-iron block and aluminum alloy cylinder head with two ignition plugs per cylinder. It has a single overhead camshaft and 8 valves (2 per cylinder).

The Z20E engine was equipped with the EFI system. It had longer connecting rods and shorter compression-height pistons than the carbureted Z20S engine. The Z20E engine was not available in the 720 pickups, which only used carbureted versions.

All Nissan Z20E engines for the US domestic market was known as NAPS-Z (NAPZ or NAPS-Z Nissan Anti-Pollution System), NAPZ motors had a dual spark-plugs head. (two per cylinder).

The Z20E engine 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. It produced 99 HP (100 PS, 86 kW) at 5,200 rpm of horsepower and 167 Nm (17.0 kg·m, 123 ft-lb) at 3,600 rpm of torque.

The breakdown of the engine code is as follows:

  • Z – Engine Family
  • 20 – 2.0 Liter Displacement
  • E – Multi Point Fuel Injection

General information

Engine Specifications
Engine codeZ20E
LayoutFour stroke, Inline-4 (Straight-4)
Fuel typeGasoline
Production1979-1988
Displacement2.0 L, 1,952 cc (121.92 cu in)
Fuel systemMulti Point Fuel Injection
Power adderNone
Max. horsepower99 HP (100 PS, 86 kW) at 5,200 rpm
Max. torque167 Nm (17.0 kg·m, 123 ft-lb) at 3,600
Firing order1-3-4-2
Dimensions (L x H x W):
Weight

Cylinder block

The Z20E 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
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:
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:INTAKE122.8-123.1 mm (4.835-4.846 in)
EXHAUST123.6-123.9 mm (4.866-4.878 in)
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/EXHAUST38.477-38.527 mm (1.5148-1.5168 in)
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 cover bolt7.8-9.8 Nm; 0.8-1.0 kg·m; 5.8-7.2 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 200SX (S110)1979-1981
Nissan Silvia (S110)1979-1981
Nissan Pickup D211985-1988
Nissan BlueBird (Y910 / YJ 910)
Nissan Skyline (UJR 30)
Datsun 7201983-1986
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