Nissan VQ30DE

Nissan VQ30DEThe Nissan VQ30DE is a 3.0 l (2,988 cc, 182.33 cu.in.) natural aspirated V6 60° 4-stroke gasoline engine from Nissan VQ-family. The Nissan VQ30DE engine was produced since 1994 as substitution for VG30DE and VE30DE. The VQ30DE was on the Ward’s 10 Best Engines list from 1995 through 2001. An improved version of the VQ30DE engine is known by the designation VQ30DE-K.

The VQ30DE motor features a lightweight aluminum block with a fully balanced four-bearings crankshaft and two aluminum heads with two camshafts (DOHC) and four valves per cylinder. The Nissan VQ30DE engine is equipped with NISSAN EGI (ECCS) electrically controlled gasoline injection device and NDIS (Nissan Direct Ignition System) with individual coils on each spark plug.

Cylinder bore and piston stroke are 93.0 mm (3.66 in) and 73.3 mm (2.886 in), respectively. Compression ratio rating is 10:1. The Nissan VQ30DE engine produced from 192 PS (142 kW, 190 HP) to 220 PS (162 kW, 217 HP) at 6,400 rpm and from 278 Nm (28.3 kg⋅m, 205 lb⋅ft) to 280 Nm (28.5 kg⋅m, 206 lb⋅ft) at 4,400 rpm.

The breakdown of the engine code is as follows:

  • VQ – Engine Family
  • 30 – 3.0 Liter Displacement
  • D – DOHC (Dual Overhead Camshafts)
  • E – Multi Point Fuel Injection

General information

Engine Specifications
Engine codeVQ30DE
LayoutFour stroke, V6
Fuel typeGasoline (petrol)
Production
Displacement3.0 L, 2,988 cm3 (182.33 cu in)
Fuel systemMulti Point Fuel Injection
Power adderNone
Power output 192 PS (142 kW, 190 HP) at 6,400 rpm
220 PS (162 kW, 217 HP) at 6,400 rpm
Torque output 278 Nm (28.3 kg⋅m, 205 lb⋅ft) at 4,400 rpm
280 Nm (28.5 kg⋅m, 206 lb⋅ft) at 4,000 rpm
Firing order1-2-3-4-5-6
Dimensions (L x W x H):
Weight

Cylinder block

The VQ30DE has an aluminum cylinder block with a four-bearings crankshaft supported system, forged steel connecting rods, a micro-finished one-piece forged crankshaft. The crankshaft journal diameter is 60 mm (2.36 in), the crankpin diameter is 45 mm (1.78 in). The cylinder block height is 215 mm (8.46 in.)

The cylinder bore is 93.0 mm (3.66 in), piston stroke is 73.3 mm (2.886 in) and compression ratio rating is 10:1. The Nissan VQ30DE motor has two compression and one oil control rings. The connecting rod’s length are 147.7 mm (5.81 in)

Cylinder block
Cylinder block alloyAluminium
Compression ratio:10.0:1
Cylinder bore:93.0 mm (3.66 in)
Piston stroke:73.3 mm (2.886 in)
Number of piston rings (compression / oil):2 / 1
Number of main bearings:4
Cylinder inner diameter (standard):93.000-93.010 mm (3.66141-3.6618 in)
Piston skirt diameter (standard):92.979-92.988 mm (3.6606-3.6609 in)
Piston pin outer diameter:21.989-22.001 mm (0.8657-0.8662 in)
Connecting rod bushing inner diameter:22.000-22.012 mm (0.8661-0.8666 in)
Connecting rod big end diameter:48.000 mm (1.8898 in)
Connecting rod center distance:147.60-147.70 mm (5.8110-5.8149 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:Top0.22-0.32 mm (0.0087-0.0126 in)
Second0.32-0.47 mm (0.0126-0.0185 in)
Oil0.20-0.60 mm (0.0079-0.0236 in)
Crankshaft main journal diameter:59.975 mm (2.3612 in)
Crankpin diameter:44.974 mm (1.7706 in)
Crankshaft center distance:36.61-36.69 mm (1.4413-1.4445 in)

Main bearing cap bolts tightening procedure and torque specs:

  • Step 1: 32-38 Nm; 3.3-3.9 kg·m; 24-28 ft·lb
  • Step 2: Turn all bolts 90-95°

After securing bearing cap bolts, make sure crankshaft turns smoothly by hand.

Connecting rod bearing nut

  • Step 1: 19-21 Nm; 1.9-2.1 kg·m; 14-15 ft·lb
  • Step 2: Turn nuts 90-95°

Crankshaft pulley bolt

  • Step 1: 39-49 Nm; 4.0-5.0 kg·m; 29-36 ft·lb
  • Step 2: Put a paint mark on the crankshaft pulley
  • Step 3: Again tighten by turning 60-65°, about the angle from one hexagon bolt head corner to another.

Flywheel (M/T) or Drive plate (A/T) fixing bolts

  • 83-93 Nm; 8.5-9.5 kg·m; 61-69 ft·lb

Cylinder head

The cylinder head is made of strong, light aluminum alloy which gives it good cooling efficiency. The camshafts are driven by single primary and two secondary chains. The primary timing chain transmits the rotational movement from the crankshaft to the intake camshafts, the secondary chains connects intake and exhaust sprocket on each head respectively.

The intake valve diameter is 36.0 mm (1.41 in), the duration is 232° and the exhaust valve diameter is 31.2 mm (1.23 in), the duration is 232°. The VQ30DE motor does not have hydraulic lifters, so special valve lifters are used to adjust the valve clearance.

Cylinder head
Block head alloyAluminium
Valve Arrangement:DOHC, chain drive
Cylinder head height:126.3-126.5 mm (4.97-4.98 in)
Valves:24 (4 valves per cylinder)
Intake valve timing:232°
Exhaust valve timing:232°
Valve head diameter:INTAKE36.0-36.3 mm (1.417-1.429 in)
EXHAUST31.2-31.5 mm (1.228-1.240 in)
Valve length:INTAKE97.32-97.82 mm (3.8315-3.8512 in)
EXHAUST94.85-95.35 mm (3.7342-3.7539 in)
Valve stem diameter:INTAKE5.965-5.980 mm (0.2348-0.2354 in)
EXHAUST5.945-5.960 mm (0.2341-0.2346 in)
Valve spring free length:INTAKE46.93 mm (1.8476 in)
EXHAUST46.93 mm (1.8476 in)
Exhaust camshaft journal diameter:№125.935-25.955 mm (1.0211-1.0218 in)
№2, 3, 4, 523.435-23.455 mm (0.9226-0.9234 in)
Camshaft cam height:INTAKE43.940-44.130 mm (1.7299-1.7374 in)
EXHAUST43.940-44.130 mm (1.7299-1.7374 in)

Head tightening procedure and torque specs:

  • Step 1: 98 Nm; 10.0 kg·m; 72 ft·lb
  • Step 2: Loosen all bolts completely
  • Step 3: 34-44 kg·m; 3.5-4.5 kg·m; 25-33 ft·lb
  • Step 4: Turn all bolts 90-95°
  • Step 5: Turn all bolts another 90-95°

Camshaft sprocket bolts

  • 119-128 Nm; 12.1-13.1 kg·m; 88-95 ft·lb

Problems and malfunctions

The Nissan VQ30DE is reliable and durable. The engine has three timing chains, their service life is about 150,000 miles of mileage (200,000-250,000 km). The valve clearance needs to be adjusted every 60,000 miles of mileage (90,000 km). The Nissan VQ30DE life expectancy is 200,000 miles of mileage (300,000 km).

Maintenance data

Valve clearance (HOT)
Intake valve0.304-0.416 mm (0.012-0.016 in)
Exhaust valve0.308-0.432 mm (0.012-0.017 in)
Compression pressure
Standard13.0 kg/cm2 (185 psi) / 300 rpm
Minimun10.0 kg/cm2 (142 psi) / 300 rpm
Compression differential limit between cylinders1.0 kg/cm2 (15 psi) / 300 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, 10W-30, 10W-40
Oil type APISG,SH or SJ
Engine oil capacity (Refill capacity) With filter change 4.0 L
Without filter change 3.7 L
Oil change interval, km (miles)6,000 (3,000)
Oil Pressure, kPa (kg/cm 2, psi) Idle speed: More than 98 (1.0, 14)
2,000 rpm: More than 294 (3.0, 43)
Ignition system
Spark plug Standard: PLFR5A-11 (NGK)
Hot type: PLFR4A-11 (NGK)
Cold type: PLFR6A-11 (NGK)
Spark plug gap1.1 mm (0.043 in)
Spark plug tightening torque20-29 Nm (2.0-3.0 kg⋅m, 14-22 ft⋅lb)

Valve clearance adjustment data

Calculate the thickness of new adjusting valve lifter so valve clearance comes within specified values.

R = Thickness of removed valve lifter
N = Thickness of new valve lifter
M = Measured valve clearance

Intake:
N = R + [M – 0.30 mm (0.012 in)]
Exhaust:
N = R + [M – 0.34 mm (0.013 in)]

Valve lifters are available in 64 sizes range from 2.32 mm (0.0913 in) to 2.95 mm (0.1161 in), in steps of 0.01 (0.0004 in).

Example (exhaust valve):
R = 2.20 mm
M = 0.52 mm
N = 2.20 + (0.52 – 0.34) = 2.38 mm, so we need a valve lifter with identification mark 238.

ColdHot
Intake0.26-0.34 mm (0.010-0.013 in)0.304-0.416 mm (0.012-0.016 in)
Exhaust0.29-0.37 mm (0.011-0.015 in)0.308-0.432 mm (0.012-0.017 in)

Vehicle applications

ModelYears Produced
Nissan Cefiro (A32, A33)1994–1998
Nissan Maxima QX (A32)1995–1999
Infiniti I301996–1999
Nissan Bassara (U30)1998–2002
Nissan Presage (U30)1998–2002
Dallara SN01, World Series by Nissan2002–2004
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