Cylinder Head
CYLINDER HEAD STANDARDS AND SERVICE LIMITS
| Item | Measurement | Qualification | Standard or New | Service Limit |
|---|---|---|---|---|
| Head | Warpage | - | 0.05 mm (0.002 in.) | |
| Height | 120.95-121.05 mm (4.762-4.766 in.) | - | ||
| Camshaft | End play | 0.05-0.20 mm (0.002-0.008 in.) | 0.20 mm (0.008 in.) | |
| Camshaft-to-holder oil clearance | 0.050-0.089 mm (0.0020-0.0035 in.) | 0.15 mm (0.006 in.) | ||
| Total runout | 0.03 mm (0.001 in.) max. | 0.04 mm (0.002 in.) | ||
| Cam lobe height | Intake, primary | 35.041 mm (1.3796 in.) | - | |
| Intake, mid | 36.445 mm (1.4348 in.) | - | ||
| Intake, secondary | 35.284 mm (1.3891 in.) | - | ||
| Exhaust | 36.326 mm (1.4302 in.) | - | ||
| Valve | Clearance (cold) | Intake | 0.20-0.24 mm (0.008-0.009 in.) | - |
| Exhaust | 0.28-0.32 mm (0.011-0.013 in.) | - | ||
| Stem O.D. | Intake | 5.485-5.495 mm (0.2159-0.2163 in.) | 5.455 mm (0.2148 in.) | |
| Exhaust | 5.450-5.460 mm (0.2146-0.2150 in.) | 5.420 mm (0.2134 in.) | ||
| Stem-to-guide clearance | Intake | 0.020-0.045 mm (0.0008-0.0018 in.) | 0.08 mm (0.003 in.) | |
| Exhaust | 0.055-0.080 mm (0.0022-0.0031 in.) | 0.11 mm (0.004 in.) | ||
| Valve seat | Width | Intake | 1.25-1.55 mm (0.049-0.061 in.) | 2.00 mm (0.079 in.) |
| Exhaust | 1.25-1.55 mm (0.049-0.061 in.) | 2.00 mm (0.079 in.) | ||
| Stem installed height | Intake | 46.75-47.55 mm (1.841-1.872 in.) | 47.80 mm (1.882 in.) | |
| Exhaust | 46.68-47.48 mm (1.838-1.869 in.) | 47.73 mm (1.879 in.) | ||
| Valve spring | Free length | Intake | 51.54 mm (2.029 in.) | - |
| Exhaust | 51.06 mm (2.010 in.) | - | ||
| Valve guide | I.D. | Intake | 5.515-5.530 mm (0.2171-0.2177 in.) | 5.55 mm (0.219 in.) |
| Exhaust | 5.515-5.530 mm (0.2171-0.2177 in.) | 5.55 mm (0.219 in.) | ||
| Installed height | Intake | 21.20-22.20 mm (0.835-0.874 in.) | - | |
| Exhaust | 20.60-21.60 mm (0.811-0.850 in.) | - | ||
| Rocker arm | Arm-to-shaft clearance | Intake | 0.026-0.067 mm (0.0010-0.0026 in.) | 0.067 mm (0.0026 in.) |
| Exhaust | 0.026-0.077 mm (0.0010-0.0030 in.) | 0.077 mm (0.0030 in.) |