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Yanmar diesel engine cylinder head 4TNE92 4TNE94 4TNE98 fits Komatsu forklift FD30T-17 FD25T-17 FD20T-17 Part numbers YM72990-311100, YM729901-11700, YM729903-11100, YM129903-11700, YM129904-11700, YM129931-11000, YM129931-11700 Special design difference with normal type. Better clear machining scrap inside the head and reduce internal temperature to avoid aging of electronic components or failure of mechanical parts due to high temperature. It is also good for regulating internal air pressure to balance with the outside air pressure and reducing condensation and prevent rust on metal parts. Baking varnish is utilized. It is a surface treatment process that applies multiple coats of primer and topcoat (usually three coats of primer and four coats of topcoat). Each coat is cured in a dust-free oven at 140°C-180°C. The high temperature curing results in a highly hardened paint film that resists scratches and abrasions, and resists fading or peeling.