Nissan QR25DE

Nissan QR25DEThe Nissan QR25DE is an 2.5 liter (2,488 cc, 151.82 cu in) inline four-cylinder, four-stroke cycle gasoline engine from Nissan QR-family. The engine was produced since 2001.

It is the same as QR20DE, but new crankshaft with 100.0 mm (3.94 in.) of piston stroke gave the engine a 2.5 L of displacement. The QR25DE engine has an aluminum cylinder block and head. It used dual overhead camshaft (DOHC), four-valve designs with continuously variable valve timing (CVTC) on the intake camshaft, individual ignition coils, electronic throttle, and multi-point fuel injection system. The engine built with cast steel connecting rods, a steel timing chain, counter-rotating balance shafts, and an aluminum intake manifold.

In 2007 the QR25DE was upgraded. The new engine has higher rev limit and improved power output. These upgrade included:

  • A larger diameter single path resin intake manifold.
  • Revised piston crown shape to support a higher compression ratio of 9.6:1 and up to 10.5:1 in Sentra SE-R Spec V.
  • The balancer shafts system has been moved back from the crank pulley to a more centric location.
  • Redeisgned camshaft profile.
  • Reinforced connecting rods.
  • Additional engine mount on the top of the motor, pulley side.

An 89.0 mm (3.504 in) cylinder bore and 100.0 mm (3.94 in) piston stroke give the engine a total of 2.5 L of displacement. Compression ratio rating is ranging from 9.5:1 to 10.5:1 depending on the vehicle. The Nissan QR25DE produces from 147 PS (108 kW; 145 HP) at 5,600 rpm up to 203 PS (149 kW; 200 HP) at 6,000 rpm of horsepower and from 213 Nm (21.7 kg·m; 157.2 ft·lb) at 4,400 rpm to 245 Nm (25.0 kg·m; 180.8 ft·lb) at 4,000 rpm of torque.

The breakdown of the engine code is as follows:

  • QR – Engine Family
  • 25 – 2.5 Liter Displacement
  • D – DOHC (Dual Overhead Camshafts)
  • E – Multi Point Fuel Injection

General information

Engine Specifications
Engine code QR25DE
Layout Four stroke, Inline-4 (Straight-4)
Fuel type Gasoline
Production 2001-
Displacement 2.5 L, 2,488 cc (151.82 cu in)
Fuel system Multi Point Fuel Injection
Power adder None
Power output 147 PS (108 KW; 145 HP) at 5,600 rpm
160 PS (118 KW; 159 HP) at 5,600 rpm
163 PS (120 KW; 161 HP) at 5,200 rpm
165 PS (121 KW; 162 HP) at 6,000 rpm
167 PS (123 KW; 165 HP) at 5,600 rpm
169 PS (124 KW; 166 HP) at 6,000 rpm
170 PS (125 KW; 168 HP) at 5,600 rpm
170 PS (125 KW; 168 HP) at 6,000 rpm
171 PS (126 KW; 169 HP) at 6,000 rpm
173 PS (127 KW; 170 HP) at 6,000 rpm
179 PS (132 KW; 177 HP) at 6,000 rpm
182 PS (134 KW; 180 HP) at 6,000 rpm
185 PS (136 KW; 182 HP) at 6,000 rpm
203 PS (149 KW; 200 HP) at 6,000 rpm
Torque output 213 Nm (21.7 kg·m; 157.2 ft·lb) at 4,400 rpm
230 Nm (23.5 kg·m; 169.7 ft·lb) at 4,400 rpm
230 Nm (23.5 kg·m; 169.7 ft·lb) at 4,000 rpm
233 Nm (23.8 kg·m; 171.9 ft·lb) at 4,000 rpm
233 Nm (23.8 kg·m; 171.9 ft·lb) at 4,400 rpm
234 Nm (23.9 kg·m; 172.7 ft·lb) at 4,000 rpm
240 Nm (24.5 kg·m; 177.1 ft·lb) at 4,000 rpm
245 Nm (25.0 kg·m; 180.8 ft·lb) at 3,600 rpm
245 Nm (25.0 kg·m; 180.8 ft·lb) at 3,900 rpm
Firing order 1-3-4-2
Dimensions (L x H x W):
Weight 330 lbs (150 kg)

Cylinder block

The QR25DE has an aluminum block, cylinder bore is 89.0 mm (3.504 in) and the piston stroke is 100.0 mm (3.94 in), the compression ratio is ranging from 9.5:1 to 10.5:1 depending on the vehicle.

The pistons are each fitted with two compression rings and single oil ring, cast steel connecting rods are 143.0 mm (5.63 in.) long. The crankshaft for QR25DE engine has two balancer shafts and supported by five main bearings. The crankshaft main journal diameter is 54.97 mm (2.164 in) and crankpin diameter is 44.97 mm (1.77 in.)

Cylinder block
Cylinder block alloy Aluminum
Compression ratio: 9.5:1 to 10.5:1
Cylinder bore: 89.0 mm (3.50 in)
Piston stroke: 100.0 mm (3.94 in)
Number of piston rings (compression / oil): 2 / 1
Number of main bearings: 5
Block Height:
Cylinder inner diameter (standard): 89.010-89.020 mm (3.5043-3.5047 in)
Piston skirt diameter (standard): 88.980-88.990 mm (3.5031-3.5035 in)
Piston pin outer diameter: 19.989-19.995 mm (0.7870-0.7872 in)
Piston ring side clearance: Top 0.045-0.080 mm (0.0018-0.0031 in)
Second 0.030-0.070 mm (0.0012-0.0028 in)
Oil 0.065-0.135 mm (0.0026-0.0053 in)
Piston ring end gap: Top 0.21-0.31 mm (0.0083-0.0122 in)
Second 0.32-0.47 mm (0.0126-0.0185 in)
Oil 0.20-0.60 mm (0.0080-0.0240 in)
Connecting rod center distance: 143.00-143.10 mm (5.63-5.63 in)
Connectin rod small end inner diameter: 20.000 mm (0.7874 in)
Connectin rod big end inner diameter: 48.000 mm (1.8898 in)
Crankshaft journal diameter: 54.979-54.978 mm (2.1645-2.1645 in)
Crankpin diameter: 44.974-44.973 mm (1.7706-1.7706 in)

Cylinder head

The engine has an aluminum cylinder head with two chain-driven overhead camshafts (four valves per cylinder) and variable valve timing (CVTC) on the intake camshaft. Intake valves are 35.5 mm (1.398 in.) in diameter, intake duration is 244 °, and the exhaust valves are 30.5 mm (1.20 in.), exhaust duration is 224 °.

The QR25DE engine does not have hydraulic lifters, so special valve lifters are used to adjust the valve clearance.

Cylinder head (Before upgrade specs)
Cylinder head alloy Aluminum
Cylinder head height: 129.4 mm (15.09 in.)
Valve Arrangement: DOHC, chain drive
Valves: 16 (4 valves per cylinder)
Intake/Exhaust duration: 244/224 °
Valve head diameter: INTAKE 35.5-35.8 mm (1.398-1.409 in)
EXHAUST 30.5-30.8 mm (1.201-1.213 in)
Valve length: INTAKE 97.16 mm (3.8252 in)
EXHAUST 98.82 mm (3.8905 in)
Valve stem diameter: INTAKE 5.965-5.980 mm (0.2348-0.2354 in)
EXHAUST 5.955-5.970 mm (0.2344-0.2350 in)
Cam height: INTAKE 45.665-45.855 mm (1.7722-1.7797 in)
EXHAUST 43.975-44.165 mm (1.7313-1.7388 in)
Outer camshaft journal diameter: №1 27.935-27.955 mm (1.0998-1.1006 in)
№2-5 23.435-23.455 mm (0.9226-0.9234 in)

Head tightening procedure and torque specs:

  • Step 1: 98.1 Nm; 10 kg·m; 72 ft·lb
  • Step 2: Loosen all bolts completely
  • Step 3: 39.2 Nm; 4.0 kg·m; 29 ft·lb
  • Step 4: Turn all bolts 75°
  • Step 5: Turn all bolts 75° again

Problems and malfunctions

The service life of the QR25DE engine is about 120,000 miles of mileage (200,000 km). The valve clearance needs to be adjusted every 60,000 miles of mileage (90,000 km).

Frequent problems and malfunctions:

  1. Oil leaks from under the cylinder head cover. That problem fixes by installing the new gasket.
  2. Idle problems, jerking. The problem in the stretched timing chain. A new timing chain will allow you to forget about any issues related to bad timing chain.
  3. Random misfire. Fuel injectors or throttle body require cleaning.
  4. High oil consumption. If your oil consumption exceeds 1 qt. per 1500 miles (0,5L per 1000 km), then the piston rings and valve oil seals need to be replaced.

Maintenance data

Valve clearance (HOT)
Intake valve 0.32-0.40 mm (0.013-0.016 in)
Exhaust valve 0.33-0.41 mm (0.013-0.016 in)
Compression pressure
Standard 12.8 kg/cm2 (181 psi) / 250 rpm
Minimun 10.8 kg/cm2 (154 psi) / 250 rpm
Compression differential limit between cylinders 1 kg/cm2 (14 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, 10W-30
Oil type API SG, SH, SJ, SL
Engine oil capacity (Refill capacity) With filter change 4.2 l (4.5 qt.)
Without filter change 4.0 l (4.25 qt.)
Oil change interval, km (miles) 5,000-10,000 (3,000-6,000)
Oil Pressure, kPa (bar, kg/cm 2, psi) Idle speed: More than 98 (0.98, 1.0, 14)
2,000 rpm: More than 294 (2.94, 3.0, 43)
6,000 rpm: More than 392 (3.92, 4.0, 57)
Ignition system
Spark plug Standard: PLFR5A-11 (NGK, Platinum type)
Cold: PLFR6A-11 (NGK, Platinum type)
Hot: PLFR4A-11 (NGK, Platinum type)
Spark plug gap 1.1 mm (0.043 in)
Spark plug torque 24.5 N·m (2.5 kg·m; 18 lb·ft)

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 – 0.28 mm (0.011 in)]
Exhaust:
N = R + [M – 0.30 mm (0.012 in)]

Valve lifters are available in 26 sizes from 6.96 mm (0.2740 in) to 7.46 mm (0.2937 in), in steps of 0.02 mm (0.0008 in).

Example (intake valve):
R = 7.10 mm
M = 0.36 mm
N = 7.10 + (0.36 – 0.28) = 7.18 mm, so we need a valve lifter with code 718.

For adjusting For checking
Cold Hot
Intake 0.24-0.32 mm (0.009-0.013 in) 0.32-0.40 mm (0.013-0.016 in)
Exhaust 0.26-0.34 mm (0.010-0.013 in) 0.33-0.41 mm (0.013-0.016 in)

Whenever valve clearances are adjusted to cold specifications, check that the clearances satisfy hot specifications and adjust again if necessary.

Vehicle applications

Model Years Produced
Nissan Bassara 1999–2003
Nissan Serena C24 2001–2005
Nissan X-Trail T30 2001–2007
Nissan Sentra SE-R & SE-R Spec V 2002–2006
Nissan Presage 2002–2009
Nissan Altima 2002–
Nissan Teana 2003–2005
Nissan Murano 2003–
Nissan Frontier 2005–
Nissan Sentra SE-R & SE-R Spec V 2007–2012
Nissan Altima Hybrid 2007–2011
Nissan X-Trail T31 2007–
Renault Koleos TR25 2007–
Nissan Rogue 2008–
Suzuki Equator 2009–2012
Nissan Teana 2013–
Nissan X-Trail T32 2013–
Nissan Elgrand E52 2010-
Nissan Terra 2018–
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We try to use verified sources and official documentation, however, differences between sources or errors in entering information may occur. We do not provide advice on technical issues related to the engines operation or repair. We do not recommend using provided information for engines repairing engines or spare parts ordering, use only official service manuals and spare-parts catalogs.

18 Comments

  1. wow – all the info I needed on one page. Thank you for the great work.
    My motor needs to be overhauled (346,000 km & never been opened). It’s using oil and smoking a bit. I’ve taken it out and fitted a temporary replacement from a breakers yard while I overhaul the original. I am a sucker for keeping things original.

    • Millions of miles through dozens of vehicles over many, many years, one would think that every minute flaw ever conceived of should have been corrected to perfection one-thousand times over. It is frustrating to think that engineers submit surefire repairs but yet they are not corrected because everything must be run through the money-grubbing accountants for approval. Then the actuaries with the really sharp pencils tell the bosses that it is cheaper, in the end, to leave these problems be and fix them as they arise. Screw quality.

  2. Does the QR25DE have an aluminum or iron block? This site says it has an aluminum block then in the next paragraph it says cast iron block. I would think Al block since it weighs 150kg but i’m not sure, just confused with the conflicting data on this page.

    • Quote the paragraph, but to my understanding the word used is -the engine- meaning is the aluminum block and the engine as whole assembly including the con.rods, crankshaft etc.Skeleton part of engine block is referred as aluminum made from paragraph.

  3. Hi what is a good Cylinder compression test reading on a QR25DE Spec V 2.5L? I have recorded: 1-155/ 2-150/ 3-155/ 4-155 on both the dry and wet tests, thanks a lot in advance.

  4. I have 304,000 miles on my 09 Altima. Not opened engine, original CVT. But something is just happening. 3 cylinders have compression 170dry, 175wet, 1 cylinder just 140dry or wet. There is a pressure/vacuum when I open oil cap. Evidently, exhaust valve leaking. Any advice? Thanks

  5. The 2007 to 2012 Sentra Spec V has a bigger cam than the rest of the QR’s. I’ve tried to find specs for them to no avail. Would you happen to have these?

  6. Just as a heads up in the US Nissan recommends 0w20 as the engine oil. My wife’s 2015 model’s owners manual specifically states this. Also what is the source of that 10w30 recommendation? I live in the desert and would be open to trying such an oil but have never seen anything by 0w20 and 5w30 recommended for this engine.

    • Just as a heads up, this engine can also run up to 20w50. 20w50 is shown in Thai, UAE, and Mexico market owners manuals for T31 X-Trail with this engine. Obviously more suited to extreme high temp markets but gives confidence you can use 40w oils such as the much praised M1 Euro 0w40, with confidence.

    • This recommendation (10w30) from the service manual for Nissan Altima 2004, maybe later this recommendation have been changed.

  7. hey problem i am having is I bought my 2005 nissan sentra se-r spec v 2.5L fwd. it was d.o.h.c . I dont remember it being a CVT. I did the 2005 come with cvtbelieve someone made a switch ?

    • from my knowledge where it says cvtc does not refer to the transmission it refers to the variable valve timing on the qr25

    • Heh. Did you check if you have a clutch pedal?

      As far as I know ALL SPEC-V versions were strictly equipped with a 6-gear manual transmission. They were not fitted with a CVT or any other type of automatic transmission.

  8. Just wanted to know if the cams happened to be installed off a tooth or two would that bend a valve on start up?

  9. Are the blocks and heads different from an Altima to frontier? I know I would have to switch both manifolds and mounts, But is everything else the same?

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