Cylinder head
• inlet valve • 35°+20'
• exhaust valve • 45°+20'
Width of valve seat:
• inlet valve • 2.2 mm
• exhaust valve • 2.0 mm
Diameter of exhaust valve seat ring 36.060 - 36.122 mm
Diameter of exhaust valve seat rings recess 36.000 - 36.025 mm
Diameter of exhaust valve seat ring (overhaul part
8370 70187)
36.260 - 36.322 mm
Diameter of exhaust valve seal ring recess (overhaul
part 8370 70187)
36.200 - 36.225 mm
Diameter of inlet valve seat ring 41.070 - 41.132 mm
Diameter of inlet valve seat ring recess 41.000 - 41.025 mm
Diameter of inlet valve seat ring (overhaul part 8370
70188)
41.270 - 41.332 mm
Diameter of inlet valve seat ring recess (overhaul
part 8370 70188)
41.200 - 41.225 mm
2.1.4 Valves and rockers
Valves and rockers
With a valve clearance of 1.0 mm:
• inlet valve opens • 2°± 2° B.T.D.C
• inlet valve closes • 18°± 2° A.B.D.C
• exhaust valve opens • 36°± 2° B.B.D.C
• exhaust valve closes • 2°± 2° A.T.D.C
Valve clearance hot and cold:
• inlet valve • 0.35 mm
• exhaust valve • 0.35 mm
Angle of valve face:
• inlet valve • 35°-20'
• exhaust valve • 45°-20'
Outside diameter of valve head:
• inlet valve • 39 mm
2. Specifications
4th Generation Engines 2-5
8370 79492
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