Nissan Armada 2025-2026 Service and Repair Manual: CylinderHead

Nissan Armada 2025-2026 Service and Repair Manual / Engine / Engine Mechanical — Service Data and Specifications (sds) / Service Data and Specifications (sds) / 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)

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) No. 2, 3, 4 0.035 - 0.076 (0.0014 - 0.0030) Camshaft bracket i ...

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 ...

Other materials:

Adjustment
FITTING ADJUSTMENT Fitting Adjustment Standard Dimension Front fender assembly Front door panel Rear door panel Front door sash molding Body side outer Front door hinge Front door striker TORX bolt : Always replace after every disassembly. : N·m (kg-m, ft-lb) : Body grease Unit: mm [in ...

NVH Troubleshooting Chart
2WD MODELS Possible cause and SUSPECTED PARTS Symptom Reference Steering Noise Shake Vibration Shimmy Judder Outer/ inner socket ball joint swinging force × — — — — Inspection Outer/ inner socket ball joint rotating torque × — — — — Inspection Outer/ inner so ...

Symptom Table
The diagnostics item numbers show the sequence for inspection. Inspect in order from item 1. Perform diagnoses of symptom table 1 before symptom table 2. SYMPTOM TABLE 1 Diagnostic item Reference Symptom Poor performance Driving performance Strange noise Shift point is high in “D” positi ...

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