Why are the welded parts of the car aren't turning?

I made an auto driving car that should turn when it hits a block but only the base turns and the other parts just stay where they were before, here is what i have:

local delayy = false
script.Parent.Parent.PrimaryPart = script.Parent
script.Parent.Touched:Connect(function(hit)
	
	if hit.Name == "RotationChange" and delayy == false then --RotatationChange is the part wich causes the car to turn
		
		delayy = true
		print("Change Rotation")	
		local orientation = hit.Orientation --the direction the car should turn

		script.Parent.Orientation = orientation --Setting the main part to the orientation

		wait(2)
		delayy = false
	end
end)