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

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

Valve specification

item | Specification
--- | ---
L8 | LF
valve full length | (mm {in}) | Intake valve: About 101.6 {4.000} Exhaust valve: About102.6 {4.039} | Intake valve: About 103.4 {4.070} Exhaust valve: About 104.7 {4.122}
Intake valve umbrella diameter | (mm {in}) | About 32.5 {1.28} | About 35 {1.38}
Exhaust valve umbrella diameter | (mm {in}) | About 28 {1.10} | About 30 {1.18}
Stem diameter | (mm {in}) | Intake valve: About 5.5 {0.22} Exhaust valve: About 5.5 {0.22}

• The intake valve and the exhaust valve are treated with the tufftride process to improve abrasion resistance.
• The valve spring is an uneven outer dimension type. It has been improved by reducing the size of the upper seat.
• The valve guide is made of the sintered alloy to improve abrasion resistance.
• The valve seal is integrated with the lower valve spring seat to simplify the unit and improve its serviceability.

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