VALVE, VALVE SPRING, VALVE SEAL, VALVE GUIDE CONSTRUCTION [LF, L5]
id0110a7101100
• The valves are heat-resistant steel. There are two intake valves, two exhaust valves per cylinder.
Valve specification
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ITEM
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Specification
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Valve full length
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(mm {in})
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Intake valve: Approx. 102.99—103.79 {4.0548—4.0862}
Exhaust valve: Approx. 104.25—105.05 {4.1044—4.1358}
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valve head diameter
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(mm {in})
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Intake valve: Approx. 35.0 {1.38}
Exhaust valve: Approx. 30.0 {1.18}
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Stem diameter
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(mm {in})
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Approx. 5.5 {0.22}
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• The intake valve and the exhaust valve are treated with the softnitriding processing to improve abrasion resistance.
• Unequal pitch beehive shape valve spring has been adopted. In addition, the upper diameter is smaller compared to the bottom diameter. As a result, fuel consumption has been improved by the reduced size of the upper valve spring seat and the reduced load on the valve spring.
• The valve guide is made of sintered alloy to improve abrasion resistance.
• The lower valve spring seat is integrated with the valve seal to simplify the unit.
