Idle speed 650 rpm Intake manifold vacuum More than 430 mmHg (16.93 in. Hg, 57.3 kPa) Compression pressure at 250 rpm STD 11.5 kg/cm² 164 psi 1,128 kPa Limit 9.0 kg/cm² 128 psi 883 kPa Differential of pressure between each cylinder Less than 1.0 kg/cm² (14 psi, 98.0 kPa) Cylinder head Head surface warpage Limit 0.10 mm 0.0039 in. Camshaft housing surface warpage Limit 0.10 mm 0.0039 in. Exhaust manifold surface warpage Limit 0.10 mm 0.0039 in. Intake manifold surface warpage Limit 0.10 mm 0.0039 in. Valve seat Refacing angle Intake 30°, 45°, 60° Exhaust 30°, 45°, 67.5° Contacting angle 45° Contacting width 1.2 – 1.6 mm 0.047 – 0.063 in. Valve guide Inner diameter 8.01 – 8.03 mm 0.3154 – 0.3161 in. bushing Outer diameter STD 13.040 – 13.051 mm 0.5134 – 0.5138 in. O/S type 0.05 13.090 – 13.101 mm 0.5154 – 0.5158 in. Replacing temperature (cylinder head side) Approx. 90°C (194°F) Valve Valve overall length STD Intake 107.5 mm 4.232 in. Exhaust 109.7 mm 4.319 in. Valve face angle IN & EX 44.5° Stem diameter Intake 7.970 – 7.985 mm 0.3138 – 0.3144 in. Exhaust 7.965 – 7.980 mm 0.3136 – 0.3142 in. Stem oil clearance STD Intake 0.025 – 0.060 mm 0.0010 – 0.0024 in. Exhaust 0.030 – 0.065 mm 0.0012 – 0.0026 in. Limit Intake 0.08 mm 0.0031 in. Exhaust 0.10 mm 0.0039 in. Stem end refacing Limit IN & EX 0.5 mm 0.020 in. Valve head edge thickness Limit Intake 0.5 mm 0.020 in. Exhaust 1.0 mm 0.039 in. Valve spring Free length Intake 49.1 mm 1.933 in. Exhaust 52.5 mm 2.067 in. Installed length Intake 40.0 mm 1.575 in. Exhaust 43.0 mm 1.693 in. Installed load Intake 34.7 – 38.3 kg 76.5 – 84.4 lb 340 – 376 N Exhaust 33.3 – 36.7 kg 73.4 – 80.9 lb 327 – 360 N Squareness 2.0 mm 0.079 in. Lash adjuster Leak down test at 20 kg (44.1 lb) 2 – 7 seconds/1 mm (0.04 in.)