Nissan Armada 2025-2026 Service and Repair Manual: Engine Mechanical Service Data and Specifications

Engine Assembly

GENERAL SPECIFICATIONS

Cylinder arrangement		V-6
Displacement cm³ (cu in)		3,492 (213.08)
Bore and stroke mm (in)		86.0 x 100.2 (3.386 x 3.944 )
Valve arrangement		DOHC
Firing order		1-2-3-4-5-6
Number of piston rings	Compression	2
	Oil	1
Number of main bearings		4
Compression ratio		10.5
Compression pressure kPa (kg/cm², psi)/250 rpm	Standard	1,100 - 1,400 (11.22 - 14.28, 159.5 - 203.0)
	Minimum	900 (9.18, 130.5)
	Differential limit between cylinders	98 (1.0, 14)

Unit: degree

Cylinder number
Valve timing : Intake valve : Exhaust valve	VTC Minimum phasing (Mechanical)			VTC Maximum phasing (Mechanical)

	a EXH valve opening angle	b INT valve opening angle	c INT open	d INT close	e EXH close	f EXH open
VTC Minimum phasing (Mechanical)	232	240	33	93	-3	55
VTC Maximum phasing (Mechanical)			40	20	64	-12

Drive Belt

DRIVE BELT

Tension of drive belt

Belt tension is not necessary, as it is automatically adjusted by drive belt auto-tensioner.

Spark Plug

SPARK PLUG

Unit: mm (in)

Make	NGK
Standard type	ILKAR8AB8G
Gap (Nominal)	0.8 (0.031)

Intake Manifold

INTAKE MANIFOLD

Unit: mm (in)

Items		Limit
Surface distortion	Intake manifold	1.0 (0.039)

Turbocharger

TURBOCHARGER

Unit: mm (in)

Items		Limit
Surface distortion	Turbocharger	0.1 (0.004)

Camshaft

CAMSHAFT

Unit: mm (in)

Items		Standard	Limit
Camshaft journal oil clearance	No. 1	0.045 - 0.086 (0.0018 - 0.0034)	0.150 (0.0059)
Camshaft journal oil clearance	No. 2, 3, 4	0.035 - 0.076 (0.0014 - 0.0030)	0.150 (0.0059)
Camshaft bracket inner diameter	No. 1	26.000 - 26.021 (1.0236 - 1.0244)	—
Camshaft bracket inner diameter	No. 2, 3, 4	23.500 - 23.521 (0.9252 - 0.9260)	—
Camshaft journal diameter	No. 1	25.935 - 25.955 (1.0211 - 1.0218)	—
Camshaft journal diameter	No. 2, 3, 4	23.445 - 23.465 (0.9230 - 0.9238)	—
Camshaft end play		0.115 - 0.188 (0.0045 - 0.0074)	0.24 (0.0094)
Camshaft cam height “A”	Intake	45.265 - 45.455 (1.7821 - 1.7896)	0.2 (0.008)*¹
	Exhaust	43.675 - 43.865 (1.7195 - 1.7269)
	Pump	57.0 - 57.4 (2.244 - 2.260)
Camshaft runout [TIR*²]		Less than 0.02 (0.0008)	0.05 (0.0020)
Camshaft sprocket runout [TIR*²]		—	0.15 (0.0059)

*¹: Cam wear limit

*²: Total indicator reading

VALVE LIFTER

Unit: mm (in)

Items		Standard
Valve lifter outer diameter	Intake	33.980 - 33.990 (1.3378 - 1.3382)
Valve lifter outer diameter	Exhaust	29.977 - 29.987 (1.1802 - 1.1806)
Valve lifter hole diameter	Intake	34.000 - 34.016 (1.3386 - 1.3392)
Valve lifter hole diameter	Exhaust	29.997 - 30.013 (1.1810 - 1.1816)
Valve lifter clearance		0.010 - 0.036 (0.0004 - 0.0014)

VALVE CLEARANCE

Unit: mm (in)

Items	Cold	Hot* (reference data)
Intake	0.26 - 0.34 (0.0103 - 0.0133)	0.304 - 0.416 (0.0120 - 0.0163)
Exhaust	0.28 - 0.36 (0.0111 - 0.0141)	0.308 - 0.432 (0.0122 - 0.0170)

*: Approximately 80°C (176°F)

AVAILABLE VALVE LIFTER

Unit: mm (in)

Identification mark		Thickness
Intake	Exhaust	Thickness
300+	300-	3.00 (0.1181)
302+	302-	3.02 (0.1189)
304+	304-	3.04 (0.1197)
306+	306-	3.06 (0.1205)
308+	308-	3.08 (0.1213)
310+	310-	3.10 (0.1220)
312+	312-	3.12 (0.1228)
314+	314-	3.14 (0.1236)
316+	316-	3.16 (0.1244)
318+	318-	3.18 (0.1252)
320+	320-	3.20 (0.1260)
322+	322-	3.22 (0.1268)
324+	324-	3.24 (0.1276)
326+	326-	3.26 (0.1283)
328+	328-	3.28 (0.1291)
330+	330-	3.30 (0.1299)
332+	332-	3.32 (0.1307)
334+	334-	3.34 (0.1315)
336+	336-	3.36 (0.1323)
338+	338-	3.38 (0.1331)
340+	340-	3.40 (0.1339)
342+	342-	3.42 (0.1346)
344+	344-	3.44 (0.1354)
346+	346-	3.46 (0.1362)
348+	348-	3.48 (0.1370)
350+	350-	3.50 (0.1378)

CylinderHead

CYLINDER HEAD

Unit: mm (in)

Items	Standard	Limit
Head surface distortion	Less than 0.03 (0.0012)	0.1 (0.004)
Normal cylinder head height “H”	126.4 (4.98)	—

VALVE DIMENSIONS

Unit: mm (in)


Valve head diameter “D”	Intake	33.2 - 33.5 (1.307 - 1.319)
	Exhaust	28.32 - 28.62 (1.1150 - 1.1267)
Valve length “L”	Intake	101.05 (3.9783)
	Exhaust	97.48 (3.8378)
Valve stem diameter “d”	Intake	5.465 - 5.480 (0.2152 - 0.2157)
	Exhaust	5.455 - 5.470 (0.2148 - 0.2154)
Valve seat angle “α”	Intake	45°15′ - 45°45′
	Exhaust
Valve margin “T”	Intake	1.1 (0.043)
	Exhaust	1.3 (0.051)
Valve margin “T” limit		0.5 (0.020)
Valve stem end surface grinding limit		0.2 (0.008)

VALVE GUIDE

Unit: mm (in)


Items		Standard	Oversize (Service) [0.2 (0.008)]
Valve guide	Outer diameter	9.523 - 9.534 (0.3749 - 0.3754)	9.723 - 9.734 (0.3828 - 0.3832)
Valve guide	Inner diameter (Finished size)	5.500 - 5.518 (0.2165 - 0.2172)
Cylinder head valve guide hole diameter		9.475 - 9.496 (0.3730 - 0.3739)	9.675 - 9.696 (0.3809 - 0.3817)
Interference fit of valve guide		0.027 - 0.059 (0.0011 - 0.0023)

Unit: mm (in)

Items		Standard	Limit
Valve guide clearance	Intake	0.020 - 0.053 (0.0008 - 0.0021)	0.08 (0.0031)
Valve guide clearance	Exhaust	0.030 - 0.063 (0.0012 - 0.0025)	0.09 (0.0035)
Projection length “L”		12.6 - 12.8 (0.496 - 0.504)

VALVE SEAT

Unit: mm (in)


Items		Standard	Oversize (Service) [0.5 (0.02)]
Cylinder head seat recess diameter “D”	Intake	34.100 - 34.116 (1.3425 - 1.3431)	34.600 - 34.616 (1.3622 - 1.3628)
Cylinder head seat recess diameter “D”	Exhaust	28.600 - 28.616 (1.1260 - 1.1266)	29.100 - 29.116 (1.1457 - 1.1463)
Valve seat outer diameter “d”	Intake	34.197 - 34.213 (1.3463 - 1.3470)	34.697 - 34.713 (1.3660 - 1.3667)
Valve seat outer diameter “d”	Exhaust	28.680 - 28.696 (1.1291 - 1.1298)	29.180 - 29.196 (1.1488 - 1.1494)
Valve seat interference fit	Intake	0.081 - 0.113 (0.0032 - 0.0044)
Valve seat interference fit	Exhaust	0.064 - 0.096 (0.0025 - 0.0038)
Diameter “d1”*¹	Intake	31.2 (1.228)
Diameter “d1”*¹	Exhaust	25.8 (1.016)
Diameter “d2”*²	Intake	32.5 - 33.0 (1.280 - 1.299)
Diameter “d2”*²	Exhaust	27.4 - 27.9 (1.079 - 1.098)
Angle “α1”	Intake	70°
Angle “α1”	Exhaust	60°
Angle “α2”	Intake	88°45′ - 90°15′
Angle “α2”	Exhaust	88°45′ - 90°15′
Angle “α3”	Intake	120°
Angle “α3”	Exhaust	120°
Contacting width “W”*³	Intake	1.0 - 1.4 (0.039 - 0.055)
Contacting width “W”*³	Exhaust	1.2 - 1.6 (0.047 - 0.063)
Height “h”	Intake	4.7 (0.185)	4.9 (0.193)
Height “h”	Exhaust	5.2 (0.205)	5.4 (0.213)
Depth “H”	Intake	5.3 (0.209)
Depth “H”	Exhaust	6.0 (0.236)

*¹: Diameter made by intersection point of conic angles “α1” and “α2”

*²: Diameter made by intersection point of conic angles “α2” and “α3”

*³: Machining data

VALVE SPRING

Items		Standard
Items		Intake	Exhaust
Free height		48.51 mm (1.9098 in)	61.76 mm (2.4315 in)
Pressure	Installation	166 - 188 N (16.94 - 19.17 kg, 37.31 - 42.26 lb)	315 - 355 N (32.13 - 36.21 kg, 70.82 - 79.80 lb)
Pressure	Valve open	384 - 432 N (39.17 - 44.06 kg, 86.32 - 97.11 lb)	473 - 533 N (48.25 - 54.36 kg, 106.33 - 119.81 lb)
Identification color		White	Yellow

Items		Limit
Items		Intake	Exhaust
Out-of-square		1.7 mm (0.067 in)	2.2 mm (0.087 in)

CylinderBlock

CYLINDER BLOCK

Unit: mm (in)


Surface flatness		Standard		Less than 0.03 (0.0012)
		Limit		0.1 (0.004)
Main bearing housing inner diameter		Standard		69.993 - 70.017 (2.7556 - 2.7566)
Cylinder bore	Inner diameter	Standard		86.000 - 86.015 (3.3858 - 3.3864)
		Wear limit		0.2 (0.008)
Out-of-round		Limit		0.015 (0.0006)
Taper				0.010 (0.0004)
Main bearing housing inner diameter grade (Without bearing)			Grade No. A Grade No. B Grade No. C Grade No. D Grade No. E Grade No. F Grade No. G Grade No. H Grade No. J Grade No. K Grade No. L Grade No. M Grade No. N Grade No. P Grade No. R Grade No. S Grade No. T Grade No. U Grade No. V Grade No. W Grade No. X Grade No. Y Grade No. 4	79.993 - 79.994 (3.1493 - 3.1494) 79.994 - 79.995 (3.1494 - 3.1494) 79.995 - 79.996 (3.1494 - 3.1494) 79.996 - 79.997 (3.1494 - 3.1495) 79.997 - 79.998 (3.1495 - 3.1495) 79.998 - 79.999 (3.1495 - 3.1496) 79.999 - 80.000 (3.1496 - 3.1496) 80.000 - 80.001 (3.1496 - 3.1496) 80.001 - 80.002 (3.1496 - 3.1497) 80.002 - 80.003 (3.1497 - 3.1497) 80.003 - 80.004 (3.1497 - 3.1498) 80.004 - 80.005 (3.1498 - 3.1498) 80.005 - 80.006 (3.1498 - 3.1498) 80.006 - 80.007 (3.1498 - 3.1499) 80.007 - 80.008 (3.1499 - 3.1499) 80.008 - 80.009 (3.1499 - 3.1500) 80.009 - 80.010 (3.1500 - 3.1500) 80.010 - 80.011 (3.1500 - 3.1500) 80.011 - 80.012 (3.1500 - 3.1501) 80.012 - 80.013 (3.1501 - 3.1501) 80.013 - 80.014 (3.1501 - 3.1502) 80.014 - 80.015 (3.1502 - 3.1502) 80.015 - 80.016 (3.1502 - 3.1502)
Difference in inner diameter between cylinders		Standard		Less than 0.03 (0.0012)

AVAILABLE PISTON

Unit: mm (in)


Items		Standard
Piston skirt diameter “A”		85.965 - 85.980 (3.3844 - 3.3850)

Items	Standard	Limit
“a” dimension	39.00 (1.5354)	—
Piston pin hole diameter	22.995 - 22.999 (0.9053 - 0.9055)	—
Piston to cylinder bore clearance	0.020 - 0.050 (0.0008 - 0.0020)	0.09 (0.0035)

PISTON RING

Unit: mm (in)

Items		Standard	Limit
Side clearance	Top	0.040 - 0.080 (0.0016 - 0.0031)	0.11 (0.0043)
	2nd	0.030 - 0.070 (0.0012 - 0.0028)	0.10 (0.0039)
	Oil ring	0.055 - 0.155 (0.0022 - 0.0061)	—
End gap	Top	0.23 - 0.28 (0.0091 - 0.0110)	0.45 (0.0177)
	2nd	0.38 - 0.48 (0.0150 - 0.0189)	0.62 (0.0244)
	Oil (rail ring)	0.17 - 0.42 (0.0067 - 0.0165)	0.72 (0.0283)

PISTON PIN

Unit: mm (in)

Items	Standard	Limit
Piston pin outer diameter	22.989 - 22.993 (0.9051 - 0.9052)	—
Piston to piston pin oil clearance	0.002 - 0.010 (0.0001 - 0.0004)	—
Connecting rod bushing oil clearance	0.007 - 0.017 (0.0003 - 0.0007)	0.030 (0.0012)

CONNECTING ROD

Unit: mm (in)

Items		Standard	Limit
Center distance		164.23 - 164.37 (6.47 - 6.47)	—
Bend [per 100 (3.94)]		—	0.15 (0.0059)
Torsion [per 100 (3.94)]		—	0.30 (0.0118)
Connecting rod bushing inner diameter*		23.000 - 23.006 (0.9055 - 0.9057)	—
Connecting rod big end diameter (Without bearing)	Grade No. A	59.000 - 59.001 (2.3228 - 2.3229)	—
	Grade No. B	59.001 - 59.002 (2.3229 - 2.3229)	—
	Grade No. C	59.002 - 59.003 (2.3229 - 2.3229)	—
	Grade No. D	59.003 - 59.004 (2.3229 - 2.3230)	—
	Grade No. E	59.004 - 59.005 (2.3230 - 2.3230)	—
	Grade No. F	59.005 - 59.006 (2.3230 - 2.3231)	—
	Grade No. G	59.006 - 59.007 (2.3231 - 2.3231)	—
	Grade No. H	59.007 - 59.008 (2.3231 - 2.3231)	—
	Grade No. J	59.008 - 59.009 (2.3231 - 2.3232)	—
	Grade No. K	59.009 - 59.010 (2.3232 - 2.3232)	—
	Grade No. L	59.010 - 59.011 (2.3232 - 2.3233)	—
	Grade No. M	59.011 - 59.012 (2.3233 - 2.3233)	—
	Grade No. N	59.012 - 59.013 (2.3233 - 2.3233)	—
Side clearance		0.20 - 0.35 (0.0079 - 0.0138)	0.35 (0.0138)

*: After installing in connecting rod

CRANKSHAFT

Unit: mm (in)


Main journal diameter. “Dm” grade	Standard	Grade No. A Grade No. B Grade No. C Grade No. D Grade No. E Grade No. F Grade No. G Grade No. H Grade No. J Grade No. K Grade No. L Grade No. M Grade No. N Grade No. P Grade No. R Grade No. S Grade No. T Grade No. U Grade No. V Grade No. W Grade No. X Grade No. Y Grade No. 4 Grade No. 7	74.975 - 74.974 (2.9518 - 2.9517) 74.974 - 74.973 (2.9517 - 2.9517) 74.973 - 74.972 (2.9517 - 2.9516) 74.972 - 74.971 (2.9516 - 2.9516) 74.971 - 74.970 (2.9516 - 2.9516) 74.970 - 74.969 (2.9516 - 2.9515) 74.969 - 74.968 (2.9515 - 2.9515) 74.968 - 74.967 (2.9515 - 2.9515) 74.967 - 74.966 (2.9515 - 2.9514) 74.966 - 74.965 (2.9514 - 2.9514) 74.965 - 74.964 (2.9514 - 2.9513) 74.964 - 74.963 (2.9513 - 2.9513) 74.963 - 74.962 (2.9513 - 2.9513) 74.962 - 74.961 (2.9513 - 2.9512) 74.961 - 74.960 (2.9512 - 2.9512) 74.960 - 74.959 (2.9512 - 2.9511) 74.959 - 74.958 (2.9511 - 2.9511) 74.958 - 74.957 (2.9511 - 2.9511) 74.957 - 74.956 (2.9511 - 2.9510) 74.956 - 74.955 (2.9510 - 2.9510) 74.955 - 74.954 (2.9510 - 2.9509) 74.954 - 74.953 (2.9509 - 2.9509) 74.953 - 74.952 (2.9509 - 2.9509) 74.952 - 74.951 (2.9509 - 2.9508)
Pin journal diameter. “Dp” grade	Standard	Grade No. A	55.974 - 55.973 (2.2037 - 2.2037)
		Grade No. B	55.973 - 55.972 (2.2037 - 2.2036)
		Grade No. C	55.972 - 55.971 (2.2036 - 2.2036)
		Grade No. D	55.971 - 55.970 (2.2036 - 2.2035)
		Grade No. E	55.970 - 55.969 (2.2035 - 2.2035)
		Grade No. F	55.969 - 55.968 (2.2035 - 2.2035)
		Grade No. G	55.968 - 55.967 (2.2035 - 2.2034)
		Grade No. H	55.967 - 55.966 (2.2034 - 2.2034)
		Grade No. J	55.966 - 55.965 (2.2034 - 2.2033)
		Grade No. K	55.965 - 55.964 (2.2033 - 2.2033)
		Grade No. L	55.964 - 55.963 (2.2033 - 2.2033)
		Grade No. M	55.963 - 55.962 (2.2033 - 2.2032)
		Grade No. N	55.962 - 55.961 (2.2032 - 2.2032)
		Grade No. P	55.961 - 55.960 (2.2032 - 2.2031)
		Grade No. R	55.960 - 55.959 (2.2031 - 2.2031)
		Grade No. S	55.959 - 55.958 (2.2031 - 2.2031)
		Grade No. T	55.958 - 55.957 (2.2031 - 2.2030)
		Grade No. U	55.957 - 55.956 (2.2030 - 2.2030)
Center distance “r”			50.06 - 50.14 (1.9709 - 1.9740)
Taper (Difference between “A” and “B”)	Limit		0.001 (0.0000393)
Out-of-round (Difference between “X” and “Y”)	Limit		0.0025 (0.0001)
Crankshaft runout [TIR*]	Standard		Less than 0.05 (0.0020)
Crankshaft runout [TIR*]	Limit		0.05 (0.0020)
Crankshaft end play	Standard		0.20 - 0.35 (0.0079 - 0.0138)
Crankshaft end play	Limit		0.35 (0.0138)

*: Total indicator reading

Connecting Rod Bearing

CONNECTING ROD BEARING

Unit: mm (in)

Grade number		Thickness	Identification color (mark)
0	UPR	1.497 - 1.500 (0.0589 - 0.0591)	Black
0	LWR	1.497 - 1.500 (0.0589 - 0.0591)	Black - Black
1	UPR	1.500 - 1.503 (0.0591 - 0.0592)	Brown
1	LWR	1.500 - 1.503 (0.0591 - 0.0592)	Brown - Brown
2	UPR	1.503 - 1.506 (0.0592 - 0.0593)	Green
2	LWR	1.503 - 1.506 (0.0592 - 0.0593)	Green - Green
3	UPR	1.506 - 1.509 (0.0593 - 0.0594)	Yellow
3	LWR	1.506 - 1.509 (0.0593 - 0.0594)	Yellow - Yellow
4	UPR	1.509 - 1.512 (0.0594 - 0.0595)	Blue
4	LWR	1.509 - 1.512 (0.0594 - 0.0595)	Blue - Blue

UNDERSIZE

Unit: mm (in)

Items	Thickness	Crank pin journal diameter
0.25 (0.0098)	1.626 - 1.634 (0.0640 - 0.0643)	Grind so that bearing clearance is the specified value.

CONNECTING ROD BEARING OIL CLEARANCE

Unit: mm (in)

Items	Standard	Limit
Connecting rod bearing oil clearance	0.026 - 0.039 (0.0010 - 0.0015)*	0.051 (0.0020)

*: Actual clearance

Main Bearing

MAIN BEARING

Unit: mm (in)


Grade number		Thickness	Width	Identification color	Remarks
0		2.500 - 2.503 (0.0984 - 0.0985)	19.9 - 20.1 (0.783 - 0.791)	Black - Black	Grade is the same for upper and lower bearings.
1		2.503 - 2.506 (0.0985 - 0.0987)		Brown - Brown
2		2.506 - 2.509 (0.0987 - 0.0988)		Green - Green
3		2.509 - 2.512 (0.0988 - 0.0989)		Yellow - Yellow
4		2.512 - 2.515 (0.0989 - 0.0990)		Blue - Blue
5		2.515 - 2.518 (0.0990 - 0.0991)		Pink - Pink
6		2.518 - 2.521 (0.0991 - 0.0993)		Purple - Purple
7		2.521 - 2.524 (0.0993 - 0.0994)		White - White
01	UPR	2.503 - 2.506 (0.0985 - 0.0987)		Brown - Brown	Grade and color are different for upper and lower bearings.
01	LWR	2.500 - 2.503 (0.0984 - 0.0985)		Black - Black
12	UPR	2.506 - 2.509 (0.0987 - 0.0988)		Green - Green
12	LWR	2.503 - 2.506 (0.0985 - 0.0987)		Brown - Brown
23	UPR	2.509 - 2.512 (0.0988 - 0.0989)		Yellow - Yellow
23	LWR	2.506 - 2.509 (0.0987 - 0.0988)		Green - Green
34	UPR	2.512 - 2.515 (0.0989 - 0.0990)		Blue - Blue
34	LWR	2.509 - 2.512 (0.0988 - 0.0989)		Yellow - Yellow
45	UPR	2.515 - 2.518 (0.0990 - 0.0991)		Pink - Pink
45	LWR	2.512 - 2.515 (0.0989 - 0.0990)		Blue - Blue
56	UPR	2.518 - 2.521 (0.0991 - 0.0993)		Purple - Purple
56	LWR	2.515 - 2.518 (0.0990 - 0.0991)		Pink - Pink
67	UPR	2.521 - 2.524 (0.0993 - 0.0994)		White - White
67	LWR	2.518 - 2.521 (0.0991 - 0.0993)		Purple - Purple

UNDERSIZE

Unit: mm (in)

Items	Thickness	Main journal diameter
0.25 (0.0098)	2.633 - 2.641 (0.1037 - 0.1040)	Grind so that bearing clearance is the specified value.

MAIN BEARING OIL CLEARANCE

Unit: mm (in)

Items	Standard	Limit
Main bearing oil clearance	0.012 - 0.022 (0.0005 - 0.0009)	0.022 (0.0009)

*: Actual clearance

← Main Bearing

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