Objectives: To study the effect of coating (with or without) in the chill plate material on the chilled cast iron engine tappet. Methods/Statistical Analysis: The impact of Coating material and chill plate over chilled depth has been examined. Experimental work was contacted with coating and without coating material. The Design Of Experiment (DOE) will be performed and taking into DOE account; the trail will be reached. The casting of tappet with differing the measure of coating material influences the chilled depth that has been checked taking into microstructure study account. Finding: Coating thickness affects the chilled and mottled depth growth. Our aim is to increase the chill depth and decrease or to avoid the molted zone. As per excremental trials, we observed that Coating thickness increases the chill depth and as well as molted depth also. We have to use the coating thickness very carefully to manage the chill and mottled depth. Combination of with coating thickness (0.3 mm) and Gray cast iron is giving good results for the chilled depth. Application/Improvement: This mushroom type tappet is used in automobile industry as especially Heavy vehicles like trucks, tractors and etc. Coating on shell mold will give us the more chill depth on the tappet head which will improve the engine tappet life and diminishing tappet casting outer surface roughness by 2-4 times.
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