4G9 ENGINE (E - W) - Cylinder Head and Valves |
Valve seat contact | Margin |
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INSPECTION
CYLINDER HEAD
(1)Check the cylinder head gasket surface for flatness by using a straightedge and thickness gauge.
Standard value: 0.03 mm
Limit: 0.2 mm
(2)If the service limit is exceeded, correct to meet the specification.
Grinding limit:*0.2 mm
*Includes/combined with cylinder block grinding
Cylinder head height (Specification when new):
119.9- 120.1 mm <SOHC>
131.9- 132.1 mm <DOHC>
119.8- 120.0 mm <DOHC - MIVEC>
131.9- 132.1 mm <DOHC - GDI>
VALVE
(1) Check the valve face for correct contact. If incorrect, reface using a valve refacer. Valve should make a uniform contact with the seat at the centre of valve face.
(2) If the margin is smaller than the service limit, replace the valve.
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| Standard value | Limit mm |
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| mm |
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Intake |
| 1.0 | 0.5 |
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Exhaust | SOHC | 1.3 | 0.8 |
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| DOHC | 1.2 | 0.7 |
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(3) Measure the overall height of the valve. | If the specified | ||
limit is exceeded, replace the valve. |
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| Standard value | Limit mm |
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| mm |
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Intake | SOHC | 110.15 | 109.65 |
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| DOHC | 104.19 | 103.69 |
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| DOHC- MIVEC | 115.63 | 115.13 |
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| DOHC- GDI | 104.19 | 103.69 |
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Exhaust | SOHC | 113.70 | 113.20 |
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| DOHC | 103.87 | 103.37 |
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| DOHC- MIVEC | 115.63 | 115.13 |
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| DOHC- GDI | 103.87 | 103.37 |
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E Mitsubishi Motors Corporation | July 1997 | Revised |