Technical data and specifications — Engine QR25DE (Nissan X-Trail T31)

General information

Cylinder arrangement		4 in a row
Cylinder capacity, cm³		2,488
Cylinder diameter and piston stroke, mm		89.0x100.0
Valve arrangement		Double overhead camshafts (DOHC)
Cylinder firing order		1-3-4-2
Number of piston rings	compression	2
	oil scraper	1
Compression ratio		9,6
Compression pressure: kPa kg/cm²/250 rpm	Standard	1412 (14,4)
	Minimum	1216(12,1)
	Maximum cylinder spread	100 (1,0)

Unit of measurement, degree

a	b	with	d	e	f
220	232	12 (28) after TDC	64(24) after NMT	10	30

() Valve timing mechanism - in the ON position

Valve timing

: Intake valves

: Exhaust valves

Drive belt

Drive belt tension

Adjusted automatically by tensioner

Spark plugs

Manufacturer	NGK
Standard candle	PLZKAR6A-11
Spark gap (nominal)	1.1 mm

Intake manifold

Parameter		Limit#
Surface warping	Intake manifold adapter	0.1 mm

Exhaust manifold

Parameter		Limit
Surface warping	Exhaust manifold	0.3 mm

Camshafts

Parameter		Standard	Limit
Oil clearance in camshaft journals	№1	0.045-0.086 mm
Inner diameter of camshaft bracket	№1	28,000-28,021 mm
	№2 3 3 5	23,500-23,521 mm
Camshaft journal outer diameter	№1	27,935-27,955 mm
	№2 3 3 5	23.435 23.455 mm
Camshaft axial play		0.115-0.188 mm
Height of cam "A"	Inlet	44.815-45.005 mm	0, 2 mm*¹
	Release	43.975-44.165 mm
Camshaft runout (maximum indicator reading)		Less than 0.02
Camshaft Sprocket Runout (maximum indicator reading)			0.15 mm

*1 Cam wear limit

Valve lifters

Parameter	Standard
Outside diameter of the push rod	33.977-33.987 mm
Pusher hole diameter	34,000-34,021 mm
Valve tappet clearance	0.013-0.044 mm

Valve clearances

Parameter	On a cold engine	On a hot engine* (standard)
Inlet	0.24-0.32 mm	0.304-0.416 mm
Release	0.26-0.34 mm	0.308-0.432 mm

*At a temperature of approx. 80°C

Cylinder head

Parameter	Standard	Limit
Surface warping	Less than 0.03 mm	0.1 mm
Nominal height "H"	129.3-129.5 mm

Valve sizes

Valve disc diameter "D"	Inlet	35.5-35.8 mm
	Release	30.3-30.6 mm
Valve length "L"	Inlet	96.84 mm
	Release	97.9 mm
Valve stem diameter "d"	Inlet	5.965-5.980 mm
	Release	5.955-5.970 mm
Valve seating angle "a"	Inlet	45°15-45°45
	Release
Edge thickness "T"	Inlet	1.1 mm
	Release	1.4 mm
Edge thickness limit "T"		0.5 mm
Limit of regrinding of the end surface of the valve stem		0.2 mm

Valve guide bushings

Parameter		Standard size	Increased by 0.2 repair size
Valve guide bushing	Outer diameter	10.023-10.034 mm	10.223-10.234 mm
	Inner diameter (finish)	6,000-6,016 mm
Diameter of the hole for the valve guide bushing in the cylinder head		9.975-9.996 mm	10.175-10.196 mm
Press fit valve guide bushing		0.027-0.059 mm
Parameter		Standard size	Maximum size
Clearance between valve stem and valve guide	Inlet	0.020-0.053 mm	0.08 mm
	Release	0.030-0.063 mm	0.09 mm
Elevation height "H"	Inlet	10.1-10.3 mm
	Release	10.0-10.4 mm

Valve seats

Parameter		Standard size	Enlarge by 0.5 repair size.
Cylinder head seat recess diameter "D"	Inlet	36,500-36,516 mm	37.000-37.016 mm
	Release	31,500-31,516 mm	32,000-32,016 mm
Valve seat outer diameter "d"	Inlet	36.597-36.613 mm	37.097-37.113 mm
	Release	31,600-31,616 mm	32,100-32,116 mm
Press fit valve seat	Inlet	0.081-0.113 mm
	Release	0.084-0.116 mm
Diameter "d1" *¹	Inlet	33.5 mm
	Release	28.0 mm
Diameter "d2" *²	Inlet	34.8-35.3 mm
	Release	29.6-30.1 mm
Angle "a1"	Inlet	60°
	Release	60°
Angle "a2"	Inlet	88°45'-90°15
	Release	88°45'-90°15
Angle "aZ"	Inlet	120°
	Release	120°
Valve seat belt width "W" *³	Inlet	0.99-1.35 mm
	Release	1.19-1.55 mm
Height "h"	Inlet	5.9-6.0 mm	5.0-5.1 mm
	Release	5.9-6.0 mm	4.91-5.01 mm
Depth "H"		6.0 mm

* 1 The diameter formed by the point of intersection of conical angles "a1" and "a2".

*2 Diameter formed by the point of intersection of conical angles "a2" and "a3".

*3 Dimensions for mechanical processing.

Valve springs

Parameter	Inlet	Release
Length in unloaded state	43.72-43.92 mm	45.29-45.49 mm
Height after installation	35.30 mm	35.30 mm
Load after installation	151-175 N (15.4-17.8 kg)	151-175 H(15.4-17.8 kg)
Height with valve open	26.30 mm	26.76 mm
Load with valve open	351-394 H (35.8-40.2 kg)	318-362 H (22.4 36.9 kg)
Color coding	Pink	Yellowish green
Ovality	19 mm

Cylinder block

Surface warping		Limit		0.1 mm
Cylinder	Inner diameter	Standard	Class 2	89,010-89,020 mm
			Class 3	89.020-89.030 mm
		Wear limit		0.2 mm
Ovality (difference between "X" and "Y")		Limit		0.015 mm
Taper (difference between "A" and "C")				0.01 mm
Class of the inner diameter of the main bearing housing in the cylinder block			Class A	58,944-58,945 mm
			Class B	58.945-58.946 mm
			Class C	58.946-58.947 mm
			Class D	58.947-58.948 mm
			Class E	58.948-58.949 mm
			Class F	58,949-58,950 mm
			Class G	58,950-58,951 mm
			Class H	58.951-58.952 mm
			Class J	58.952-58.953 mm
			Class K	58.953-58.954 mm
			Class L	58,954 58,955 mm
			Class M	58.955-58.956 mm
			Class N	58.956-58.957 mm
			Class R	58.957-58.958 mm
			Class R	58.958-58.959 mm
			Class S	58,959-58,960 mm
			Class T	58,960-58,961 mm
			Class U	58.961-58.962 mm
			Class V	58.962-58.963 mm
			Class W	58.963-58.964 mm
			Class X	58.964-58.965 mm
			Class Y	58.965-58.966 mm
			Class 4	58.966-58.967 mm
			Class 7	58.967-58.968 mm
Difference in internal diameter between cylinders		Standard		Less than 0.03 mm

Pistons

Piston skirt diameter "A"	Standard	Class 2	88,990-89,000 mm
		Class 3	89,000-89,010 mm
		Increased repair size by 0.20	89.180-89.210 mm
Measuring point "H"			37.5 mm
Piston pin bore diameter		Class 0	19,993-19,999 mm
		Class 1	19,999-20,005 mm
Clearance between piston and cylinder wall		Standard	0.010-0.030 mm
		Limit	0.08 mm

Piston rings

Parameter		Standard	Limit
Lateral clearance	Upper compression	0.040-0.080 mm	0.11 mm
	Second compression	0.030-0.070 mm	0.1 mm
	Oil scraper ring	0.045-0.125 mm	-
Gap in the lock	Upper compression	0.23-0.33 mm	0.54 mm
	Second compression	0.33-0.48 mm	0.80 mm
	Oil scraper (scraper)	0.20-0.45 mm	0.90 mm

Piston pins

Parameter		Standard	Limit
Piston pin outer diameter	Class 0	19,989-19,995 mm
	Class 1	19.995-20.001 mm
Oil clearance between piston and piston pin		0.002-0.006 mm
Connecting rod small end bushing oil clearance		0.005-0.017 mm	0.030 mm

Connecting rods

Distance between centers		43.00-143.10 mm
Bending (100)	Limit	0.15 mm
Bending (100)	Limit	0.3 mm
Inner diameter of connecting rod small end bushing*	Class 0	20,000-20,006 mm
	Class 1	20.006-20.012 mm
Lateral clearance	Standard	0.20-0.35 mm
	Limit	0.5 mm
Big End Connecting Rod Inner Diameter	Class 0	48,000-48,001 mm
	Class 1	48.001-48.002 mm
	Class 2	48.002-48.003 mm
	Class 3	48.003-48.004 mm
	Class 4	48.004-48.005 mm
	Class 5	48.005-48.006 mm
	Class 6	48.006-48.007 mm
	Class 7	48.007-48.008 mm
	Class 8	48.008-48.009 mm
	Class 9	48,009-48,010 mm
	Class A	48,010-48,011 mm
	Class B	48.011-48.012 mm
	Class C	48.012-48.013 mm

*After installation in the connecting rod

Main bearings

Class		Thickness (mm)	Color coding	Notes
0		1,973-1,976	Black	The class and color of the upper and lower bearings are the same
1		1,976-1,979	Brown
2		1,979-1,982	Green
3		1,982-1,985	Yellow
4		1,985-1,988	Blue
5		1,988-1,991	Pink
6		1,991-1,994	Violet
7		1,994-1,997	White
01	Upper	1,973-1,976	Black	The class and color of the upper and lower bearings are different
	Lower	1,976-1,979	Brown
12	Upper	1,976-1,979	Brown
	Lower	1,979-1,982	Green
23	Upper	1,979-1,982	Green
	Lower	1,982-1,985	Yellow
34	Upper	1,982-1,985	Yellow
	Lower	1,985-1,986	Blue
45	Upper	1,985-1,988	Blue
	Lower	1,988-1,991	Pink
56	Upper	1,988-1,991	Pink
	Lower	1,991-1,994	Violet
67	Upper	1,991-1,994	Violet
	Lower	1,994-1,997	White

Table of bearings of reduced repair size

Parameter	Thickness	Main journal diameter
0.25 mm	2.108-2.114 mm	Regrind the main journal so that the oil clearance complies with the standard.

Main bearing oil clearance

Main bearing oil clearance	Standard	No. 1,3 and 5	0.012-0.022 mm
		No. 2 and 4	0.018-0.028 mm
	Limit		0.1 mm