Cylinder Head Assembly: Specifications
Cylinder headFlatness of gasket surface 0.03 mm (0.0012 inch)
Flatness of manifold mounting surface
Intake Max 0.5 mm (0.0197 inch)
Exhaust Max 0.15 mm (0.0059 inch)
Diameter of valve guide hole
0.05 OS 12.05 - 12.068 mm (0.474 - 0.475 inch)
0.25 OS 12.25 - 12.268 mm (0.482 - 0.483 inch)
0.50 OS 12.50 - 12.518 mm (0.492 - 0.493 inch)
Diameter of seat ring hole of intake valve
0.3 OS 36.325 mm (1.429 - 1.430 inch)
0.6 OS 36.60 - 36.625 mm (1.441 - 1.442 inch)
Diameter of seat ring hole of exhaust valve
0.3 OS 33.30 - 33.325 mm (1.311 - 1.312 inch)
0.6 OS 33.60 - 33.625 mm (1.323 - 1.324 inch)
Valve
Valve length
Intake
Specifications-3.5 106.28 mm (4.18 inch)
Limit 105.78 mm (4.165 inch)
Exhaust
Specifications-3.5 105.4 mm (4.15 inch)
Limit 104.9 mm (4.129 inch)
Outer diameter of stem
Intake 6.565 - 6.580 mm (0.258 - 0.259 inch)
Exhaust 6.530 - 6.550 mm (0.257 - 0.258 inch)
Face angle 45° - 45.5°
Seat width (Margin)
Intake
Specifications-3.5 1.0 mm (0.039 inch)
Limit 0.5 mm (0.02 inch)
Exhaust
Specifications-3.5 1.5 mm (0.059 inch)
Limit 1.0 mm (0.039 inch)
Clearance (Between stem and guide)
Intake
Specifications-3.5 0.02 - 0.05 mm (0.0009 - 0.0020 inch)
Limit 0.1 mm (0.0039 inch)
Exhaust
Specifications-3.5 0.05 - 0.085 mm (0.0020 - 0.0033 inch)
Limit 0.15 mm (0.0059 inch)
Valve spring
Free length
Specifications-3.5 46.4 mm (1.8268 inch)
Limit 45.4 mm (1.7874 inch)
Load 24.0 kgf / 37.9 mm (53 lbs./1.492 inch)
Rectangularity
Specifications-3.5 2°
Limit 4°
Cylinder head cover bolts 7.8 - 9.8 Nm (80 - 100 kgf-cm, 5.8 - 7.2 ft. lbs.)
Cylinder head bolts
Cold engine 105 - 115 Nm (1050 - 1150 kgf-cm, 75 - 82 ft. lbs.)
Fuel hose clamp to rear cylinder head assembly 12 - 15 Nm (120 - 150 kgf-cm, 9 - 11 ft. lbs.)
Generator inlet pipe to front cylinder head assembly 12 - 15 Nm (120 - 150 kgf-cm, 9 - 11 ft. lbs.)
Intake manifold to engine 20 - 23 Nm (200 - 230 kgf-cm, 14 - 17 ft. lbs.)
Air intake surge tank to intake manifold (bolt) 15 - 20 Nm (150 - 200 kgf-cm, 11 - 14 ft. lbs.)
Air intake surge tank to intake manifold (nut) 15 - 20 Nm (150 - 200 kgf-cm, 11 - 14 ft. lbs.)
Intake manifold to cylinder head nuts 12 - 15 Nm (120 - 150 kgf-cm, 9 - 11 ft. lbs.)
Throttle body to surge tank bolts 10 - 13 Nm (100 - 130 kgf-cm, 7 - 9.5 ft. lbs.)
Bearing oil clearance 0.05 - 0.09 mm (0.002 - 0.0035 inch)
Camshaft bearing cap
Outer 19 - 21 Nm (190 - 210 kgf-cm, 14 - 15 ft. lbs.)
Inner 10 - 12 Nm (100 - 120 kgf-cm, 7 - 9 ft. lbs.)
Heat protector to exhaust manifold 12 - 15 Nm (120 - 150 kgf-cm, 9 - 11 ft. lbs.)
Exhaust manifold to engine 40 - 45 Nm (400 - 450 kgf-cm, 29 - 32 ft. lbs.)
Exhaust manifold to cylinder head nuts 25 - 30 Nm (250 - 300 kgf-cm, 18 - 22 ft. lbs.)
Exhaust manifold heat protector to exhaust manifold bolts 12 - 15 Nm (120 - 150 kgf-cm, 9 - 11 ft. lbs.)
Oxygen sensor to exhaust manifold 40 - 50 Nm (400 - 500 kgf-cm, 29 - 36 ft. lbs.)
Front exhaust pipe to exhaust manifold nuts 30 - 40 Nm (300 - 400 kgf-cm, 22 - 29 ft. lbs.)
CYLINDER HEAD BOLT
Tighten the cylinder head bolt in the picture using the so-called special tool "head bolt wrench".
INTAKE MANIFOLD
After replacing the intake manifold gasket, install the surge tank tightening the specified torque.
CAMSHAFT BEARING
Tighten the bearing cap in two or three steps. Tighten it to the standard torque at the last stage.