VALVE, VALVE SPRING, VALVE SEAL, VALVE GUIDE CONSTRUCTION [L8, LF, L5]

id0110a6101100

•  The valves are heat-resistant steel. There are two intake valves, two exhaust valves per cylinder.

Valve specification

ITEM

L8

LF

L5
Valve full length
(mm {in})
Intake valve: Approx. 102.99—103.79 {4.0548—4.0862}
Exhaust valve: Approx. 104.25—105.05 {4.1044—4.1358}
Intake valve head diameter
(mm {in})
Approx. 32.50 {1.280}
Approx. 35.00 {1.378}
Exhaust valve head diameter
(mm {in})
Approx. 28.00 {1.102}
Approx. 30.00 {1.181}
Stem diameter
(mm {in})
Intake valve: Approx. 5.5 {0.22}
Exhaust valve: Approx. 5.5 {0.22}

•  The intake valve and the exhaust valve are treated with the tufftride 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.
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